University of Thessaly – School of Engineering
DEPARTMENT OF
MECHANICAL
ENGINEERING
Research Activities
Volos, April 2009
THE UNIVERSITY OF THESSALY
The University of Thessaly was founded in 1984 in a region
characterised by industrial and agricultural activities. The
central administration of the University is located in Volos,
conveniently located between Athens (320 km) and
Thessaloniki (200 km). Volos offers visitors the pleasures of the
sea the nearby islands as well as the adventures of Mount
Pelion, a traditional Greek holiday and ski resort.
The University of Thessaly is organized in the following Schools
and Departments distributed in four cities in the Region of
Thessaly:
School of Humanities (Volos): Department of Primary School
Education, Department of Pre-School Education, Department of
Special Education, Department of History-Archaeology-Social
Anthropology
School of Agricultural Sciences (Volos): Department of
Agriculture: Crop Production & Agricultural Environment,
Department of Agriculture: Animal Production & Marine
Environment
THE CITY OF VOLOS AND THE UNIVERSITY
The city of Volos built in the Pagasitikos Gulf, in the foot of
Mount Pilion, is the mainly exit to the sea of the large
agricultural region of Thessaly. The metropolitan area of Volos
with a population of 120000 includes the municipalities of
Volos, Nea Ionia, Iolkos and surrounding communities. Volos
has evolved into an industrial centre and the third port of the
country. Its economy is based on manufacturing industry,
trade, services and tourism.
School of Engineering (Volos): Department of Planning &
Regional Development, Department of Mechanical Engineering,
Department of Civil Engineering, Department of Architecture,
Department of Computer and Communication Engineering
School of Health Sciences: Department of Medicine (Larissa),
Department of Veterinary Medicine (Karditsa), Department of
Biochemistry & Biotechnology (Larissa).
Independent Departments: Department of Physical Education &
Sports Sciences (Trikala), Department of Economics Studies
(Volos).
The relation of Volos with the University is determined by a
dynamic and creative interaction between the academic
community and the citizens of Volos. The spontaneous
atmosphere of student life is diffused into the town with the
lively interaction of students and residents bringing a new
wealth of ideas to the youth of Volos (http://www.volosm.gr).
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THE DEPARTMENT OF
MECHANICAL ENGINEERING
The Department of Mechanical Engineering was founded in
1985 and admitted its first undergraduate students in 1990.
The Department has a rapidly growing Mechanical engineering
program with state-of-the-art educational and research
activities. The Department is housed in modern facilities of
the School of Engineering campus located in the city of Volos.
The main teaching goal of the Department is to educate
Mechanical engineers so that they can handle new
technologies and become instrumental in the development
and the management of efficient production processes of
competitive industrial units.
The Department is developing modern teaching & research
laboratory facilities in order to be able to participate in
national, European and international teaching and research. It
also seeks to establish a bridge between academic research
and industrial development in the fields of mechanics,
materials science, energy technology and production
management. The faculty is providing expert R&D support to
industrial units and government agencies, especially those
located in central Greece.
MISSION AND OBJECTIVES
OF THE GRADUATE STUDIES PROGRAM
The Department offers a graduate program leading to the
degree of Doctor of Philosophy and to an Advanced Master of
Science degree in Mechanical Engineering. Priority is given to
doctoral candidates. Research is strongly emphasized because
of its importance to the advancement of science and
engineering and the vitality it adds to the education provided
by the Department.
The thin liquid film research facility
The graduate curriculum provides students with advanced
scientific skills to conduct fundamental and applied research.
The main goal of the graduate studies is the preparation of
scientists and engineers to support the local, national and
European industry, as well as the research institutions and
universities.
The faculty is involved in a variety of fundamental and applied
research in close collaboration with Greek and European
industry. Novel results are systematically published in
international, peer-reviewed scientific journals.
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ADMISSION AND REQUIREMENTS
The scanning electron microscope
Admission to the Graduate Program
Students graduated from Greek or foreign universities are
admitted as follows:
• Graduates from all Engineering disciplines
• Graduates of Physics, Chemistry, Mathematics and
Computer Science
• Graduates of Technological Educational Institutes may also
be admitted upon successful examination.
Degree requirements
All admitted graduate students are required to pass
successfully a series of graduate courses taught by the
department faculty. Graduate students for the Advanced
Master of Science degree are also required to complete a
Graduate Research thesis. Graduate students for the Doctoral
degree are required to complete a PhD thesis.
AREAS OF RESEARCH
• Fluid mechanics & industrial applications, aeroelasticity,
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The subsonic wind tunnel facility
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Degree Duration
The minimum duration of the Advanced Master of Science
degree is two (2) semesters of courses and one (1) semester of
research. The minimum duration of the PhD degree is three
(3) years.
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Course Fees - Scholarships
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Graduate students are required to pay a fee of 900 Euros per
semester. Course fees may be waived and scholarships may be
awarded depending on academic qualifications and
performance.
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Internal combustion engine test bed
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magnetohydrodynamics, particle-gas/liquid flow, reacting
flow, blood flow
Biomechanics, interfacial and hydrodynamic stability
Transport phenomena, two-phase liquid/gas flow, analysis
and design of transport processes
Kinetic theory, non-equilibrium flows and transport
phenomena, microfluidics, vacuum flows
Internal combustion engines, design of energy systems,
pollution abatement technologies
Design and development of fuel cells and catalytic
materials for hydrogen production from biomass
Energy and water conservation in industry
Alloy Design, Computational Alloy Thermodynamics and
Kinetics, Automotive TRIP steels, Aircraft Aluminium and
Magnesium Alloys, Hydrogen Trapping and Embrittlement,
Welding HAZ Modelling
Continuum mechanics, plasticity, fracture mechanics,
computational mechanics, finite elements
Non linear structural analysis – structural stability
Structural mechanics, analysis & design of steel structures
Probabilistic structural dynamics, structural identification
and control, structural reliability, design optimisation
Optimal, robust and adaptive systems control, estimation
and identification, robotics
Manufacturing processes, tribology, metrology, machine
tools, engineering design
Modelling and analysis of production-inventory systems,
operations research
Technology, innovation and knowledge management
Total quality management, reliability and maintenance
Transport science, logistics, network equilibrium and
optimisation methods
Analytical and numerical techniques in engineering
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DEPARTMENT DIVISIONS & LABORATORIES
Teaching and research in the Department of Mechanical &
Industrial Engineering is carried out in three Divisions, each
incorporating the following laboratories.
DIVISION OF
MECHANICS, MATERIALS & MANUFACTURING
Laboratory of Manufacturing
(Director: Assist. Prof. G. Petropoulos)
Manufacturing Technology,
Tribology, Robotics
DIVISION OF
ENERGY, INDUSTRIAL PROCESSES &
POLLUTION ABATEMENT TECHNOLOGY
Machine
Tools,
Metrology,
Laboratory of Materials
(Director: Prof. G. Haidemenopoulos)
Laboratory of Alternative Energy Conversion Systems
(Director: Assoc. Prof. P. Tsiakaras)
Structure-Property-Processing Relationships in Metals & Alloys,
Physical Metallurgy, Materials Characterization, Mechanical
Behaviour, TRIP Steels, Aluminium and Magnesium Alloys,
Welding , Corrosion Testing, Fractography, Failure Analysis
Thermodynamics,
Environmental
Catalysis,
Catalytic
Combustion, Chemical Reactor and Reaction Engineering, Fuel
Cell Engineering, Batteries, Electric Vehicles
Laboratory of Mechanics and Strength of Material
(Director: Prof. N. Aravas)
Laboratory of Fluid Mechanics & Turbomachinery
(Director: Prof. N. Vlachos)
Computational Mechanics, Elasticity, Plasticity, Fracture
Mechanics, Continuum Mechanics, Strength of Materials,
Mechanical Testing of Materials
Fluid Mechanics, Aerodynamics, Pumps, Turbomachines, Wind
Turbines, Aeroelasticity, Environmental Flows, Reacting Flow,
Particle-gas/liquid Flow, Blood Flow, Magneto-hydrodynamics,
Flow Diagnostics (Laser etc), Computational Fluid Dynamics
Laboratory of System Dynamics
(Director: Prof. C. Papadimitriou)
Laboratory of Thermodynamics & Thermal Engines
(Director: Prof. T. Stamatelos)
Applied Thermodynamics, Internal Combustion Engines,
Exhaust Emissions and Exhaust After-treatment, Industrial
Refrigeration, Heating, Ventilation and Air Conditioning,
Building Energy Systems
Laboratory of Transport Processes & Process Equipment
(Director: Prof. V. Bontozoglou)
Transport Phenomena, Mass Transfer, Physical & Chemical
Process Equipment, Analytical and Computational Methods in
Thermal Science, Kinetic Theory of Gases, Pollution
Abatement Technology, Renewable Energy Sources (biomass,
geothermal etc.)
Analysis, Design and Optimization of Dynamic Systems,
Vibrations and Dynamics of Machines, Uncertainty Analysis,
Stochastic Structural Dynamics, Diagnostics & Reliability of
Mechanical Systems
DIVISION OF
PRODUCTION & INDUSTRIAL MANAGEMENT
Laboratory of Production Management
(Director: Prof. G. Liberopoulos)
Operations Research & Management Science (Optimization,
Stochastic Modelling, Discrete Event Dynamic System
Simulation), Production and Operations Management (Planning
& Control of Production-Inventory Systems, Reliability &
Maintainability Engineering), and Transportation Science
(Network Equilibrium and Optimization, Optimum Path
Algorithms, Traffic Science)
Laboratory of Systems Optimization
(Director: Prof. A. Ziliaskopoulos)
Stochastic Optimization Methods, Online and Robust Routing
and Scheduling, Assignment Methods (Online and Offline,
Equilibrium Modelling, Knapsack Algorithms
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RESEARCH FACILITIES
DIVISION OF ENERGY, INDUSTRIAL PROCESSES &
POLLUTION ABATEMENT TECHNOLOGY
Laboratory of Alternative Energy Conversion Systems:
Fully computerised mass spectrometer – Omnistat
Balzers, Fully computerized gas chromatographs (TCD,
FID) - PerkinElmer, Sigma300 and Shimadzu, Gas
analyzers (CH4, CO2, CO, O2, Η2, NOx) – Hartmann and
Braun, Function generators – AMEL, Fully computerized
mass flow controllers-Brooks, Fully computerized
Electrochemical Station-AMEL system 5000, Digital
multimeters, Duel Cells – SOFC type and PEMFC type.
Laboratory of Fluid Mechanics & Turbomachinery:
Subsonic wind tunnel (50x70 cm2, 30 m/s), Supersonic
wind tunnel (10x10 cm, Mach 1.5, under construction),
Air tunnel (1in. jet, 50 m/s - 2×60 cm channel, 10 m/s),
Laser Doppler anemometer (1-channel), Phase Doppler
anemometer (1-channel), Hot wire anemometer (2channels), In-house particle image velocimeter (PIV),
Schlieren flow visualization, Video & digital camera,
Workstations with printers and scanner, Computational
Fluid Dynamics packages (GLASS3D, FUSION2D&3D,
CORE2D, DIAN3D, TEACH, Aero-elasticity CAFFA2D, MHD
CAFFA2D, FLUENT, PHOENICS), 2D and 3D Computational Fluid Dynamic Finite Element & Boundary
Element packages, Digital signal processing systems,
Parallel programming on PC clusters.
Student-made model wing in the wind tunnel
Laboratory of Thermodynamics & Thermal Engines:
Engine test cell with a 150 kW, Froude-Consine
computer controlled eddy current dynamometer with
TEXCEL 100 direct digital control system (transient
testing capabilities), Controller linked to a PC Data
Acquisition system, A DW10 2-liter HDI diesel engine.
Engine management system (ECU) interfacing software
and hardware, Ruggerini Brio 91 single cylinder engine
with mini-scale filters and catalytic converters. Exhaust
gas analyzers (CO, CO2, HC, NO), HC FID analyzer, Air
and fuel flow meters, Catalytic converter and diesel
filter systems. Specially designed test rig for detailed
flow distribution measurements in catalytic converters
and filters, Laboratory oven (900ºC max) for aging and
regeneration of full-sized converters and diesel filters,
Networked PC’s and peripherals, In-house software for
performance computations of main types of exhaust
after-treatment devices, integrated in the form of a
CAE design toolkit, TRNSYS 15/IISiBat software for
(advanced vehicle concepts, solar energy systems,
building energy systems).
Laboratory of Transport Processes & Process
Equipment: Horizontal and vertical 25 mm i.d.
pipelines for gas-liquid flows, two inclined film flow
channels, fluorescence imaging system, CCD and highspeed video cameras, heat exchanger test-bench, flowpressure-temperature
sensors/controllers,
thermogravimetric analysis, bomb calorimeter, UV-spectrophotometer, gas chromatograph, water characterisation
instruments (conductivity meter, pH meter, turbidity
meter, viscometer, refractometer etc.), PC network,
commercial and in-house software, cluster consisting of
24 PCs with 64 bit processors and 2 GB RAM each, inhouse computer codes.
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RESEARCH FACILITIES (cont’d)
DIVISION OF MECHANICS, MATERIALS &
MANUFACTURING
Laboratory of Materials: Metallurgical microscopes and
stereomicroscopes. Hardness and microhardness testers,
Heat treating furnaces, Metallographic specimen
preparation facilities, Corrosion testing equipment.
Thermal analysis equipment including differential
scanning calorimeter (DSC) and dilatometer, Scanning
electron microscope (SEM), Atomic force microscope
(AFM), Laboratory CO2 laser facility with 2-axis CNC
table, cutting head and vacuum chamber for Laser
chemical vapor deposition (LCVD), Computational alloy
thermodynamics software (Thermo-Calc), Computational alloy kinetics software (DICTRA).
Laboratory of Manufacturing: Milling machine,
Automatic lathes, Drilling machine, Piezoelectric
dynamometers, Profilometer, Tool makers' microscope,
Stereoscope, Vibration analyzer, Tribometer (pin on
disc), Viscometers, Metrological height machine,
Hardness meter.
Laboratory of Mechanics and Strength of Materials:
Hardware: Unix workstation with 4 processors for
parallel computing, 6 Unix workstations, printers,
scanners. Software: Finite element package ABAQUS,
and
software
for
computational
mathematics
(Mathematica). KYOWA PCD-300A portable data
acquisition unit that is suited for strain/displacement
measurements in laboratory mechanical testing
facilities as well as in-service structural applications
under static and dynamic loading conditions; the unit
enables the simultaneous measurement for 8 sensors
(strain gauges or LVDT).
Laboratory of System Dynamics: Experimental
structural dynamics hardware: 16-channel data
acquisition system, K-beam accelerometers, Piezobeam
accelerometers, impulse force hammer, electromechanical shaker, power amplifiers. Computational
dynamics software: SDTools (Experimental modal
analysis, finite element modelling, structural dynamics
and updating), ADAMS (dynamic analysis of multi-body
systems), in-housed developed software for structural
model updating and damage detection.
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DIVISION OF PRODUCTION & INDUSTRIAL
MANAGEMENT
Laboratory of Production Management: It includes a
Local Area Network of over ten PC's running on Windows
2000 Professional (built on NT technology), providing
access to various software including software on
statistical analysis, optimization, discrete event system
simulation, enterprise resource planning, total
productive maintenance, queuing model analysis, and
process system modelling.
Laboratory of Systems Optimization: 10 Workstations,
a unix cluster composed of three SuperMicro dualprocessor UNIX servers and one Win2003 Server, a
number of printing and communication devices used in
the lab’s research, such as GPS-enabled phones, fully
autonomous GPS tracking units etc. Fully equipped
development environments for java, PHP, C++, Fortran,
AIR. GIS applications, Web 2.0 applications for GIS data,
spatial data databases, optimization software such as
AMPL/CPLEX.
GENERAL FACILITIES
Computer Centre
A modern Digital Computer Centre has been developed to
serve the educational and research needs of the Department.
Two local networks based upon the TCP/IP and Novell/IPX
protocols are connected with the GUnet and GRnet networks
to facilitate communication with other computing sites in
Greece and worldwide via Internet.
Electromechanical Workshop
The teaching and research activities of the Department are
supported by the Electro-Mechanical Workshop where test
sections and special constructions are manufactured.
Library
The scientific literature needs of students, researchers, and
faculty of the Department are met by the University Central
Library, the collections of which are fully computerized.
Students and researchers have access to the majority of
journals in the field of Mechanical and Industrial Engineering
via the University Intranet.
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GRADUATE COURSES OFFERED
ACADEMIC YEARS 2008-2009 & 2009-2010
DIVISION OF
ENERGY, INDUSTRIAL PROCESSES & POLLUTION
DIVISION OF MECHANICS, MATERIALS &
ABATEMENT TECHNOLOGY
MANUFACTURING
• Advanced Fluid Mechanics
• Advanced Transport Phenomena
• Chemical Process Engineering
• Computational Fluid Dynamics & Heat Transfer
• Design & Analysis of Electrochemical Processes
• Internal Combustion Engines - Chemically Reacting Flows
• Internal Combustion Engines - Thermodynamics & Gas
Dynamics
• Kinetic Theory and Microfluidics
• Measurement Techniques in Thermal Sciences
• Stability of Thermo-Hydraulic Systems
• Turbulent Flow Phenomena
• Two-phase Flows and Phase Change
• Advanced Computational Dynamics
• Advanced Control Theory
• Advanced Finite Element Methods
• Advanced Mechanical Behaviour of Materials
• Advanced Physical Metallurgy
• Advanced Tribology
• Continuum Mechanics
• Fracture Mechanics
• Multivariable Control Systems
• Non Linear Structural Analysis - Stability
• Physical Models of Manufacturing Processes
• Plasticity
• Probabilistic Structural dynamics
• System Dynamics
DIVISION OF PRODUCTION & INDUSTRIAL
GENERAL COURSES
MANAGEMENT
• Advanced Engineering Mathematics
• Advanced Numerical Analysis
• Differential and Integral Equations
• Advanced Probability & Statistics
• Optimization and Flows of Networks with Applications to
Logistics
• Optimization Theory
• Production Systems
• Quality, Reliability and Maintenance of Engineering
Systems
Teaching in the Classroom
• Scheduling - Project Management
• Simulation of Manufacturing Systems
• Stochastic Processes
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SUMMER SCHOOLS
The faculty has been actively involved in the organisation of
several education-oriented summer schools, attracting
instructors and students from home and abroad.
Seventh School and Workshop on Fusion Physics and
Technology
Volos, Greece, 14-19 April 2008
Supported by Association Euratom - Hellenic Republic
Organizers: Profs. N. Vlachos, D. Valougeorgis, N. Pelekasis
Sixth School of Fusion Science and Technology
Volos, Greece, 26-31 March 2007
Supported by Association Euratom - Hellenic Republic
Organizers: Profs. N. Vlachos, D. Valougeorgis, N. Pelekasis
Fifth School of Fusion Science and Technology
Volos, Greece, 10-14 April 2006
Supported by Association Euratom - Hellenic Republic
Organizers: Profs. N. Vlachos, D. Valougeorgis, N. Pelekasis,
A. Grecos
Eighteenth School on Nonlinear Science & Complexity
Volos, Greece, 15-30 July 2005
Organizers: Prof. A. Bountis (University of Patras) and
Prof. N. Vlachos (University of Thessaly)
Fourth School of Fusion Science and Technology
Volos, Greece, 18-23 April 2005
Supported by Association Euratom - Hellenic Republic
Organizers: Profs. N. Vlachos, A. Grecos, D. Valougeorgis,
N. Pelekasis
Third School of Fusion Science and Technology
Volos, Greece, 29 Mar. - 2 Apr. 2004
Supported by Association Euratom - Hellenic Republic
Organizers: Profs. N. Vlachos, A. Grecos, D. Valougeorgis,
N. Pelekasis
Diffusion Phenomena in
Engineering and Environmental Flows
Volos, Greece, 8-18 July 2003
Instructors : Prof. J. Redondo (University of Catalunya, Spain)
Prof. H. Stapountzis (University of Thessaly, Greece)
Prof. Stavros Tavoularis (University of Ottawa, Canada)
Prof. Ch. Vassilicos (Imperial College, UK)
Numerical Methods for
Finite Strain Elastoplastic Problems
Volos, Greece,18-29 August 2003
Instructor: Prof. N. Aravas (Univ. of Thessaly, Greece)
Second School of Fusion Science and Technology
Volos, Greece, 22-27 May 2003
Supported by Association Euratom - Hellenic Republic
Organizers: Profs. N. Vlachos, A. Grecos, D. Valougeorgis,
N. Pelekasis
First School of Fusion Science and Technology
Volos, Greece, 16-21 May 2002
Supported by Association Euratom - Hellenic Republic
Organizers: Profs. A. Grecos, N.S. Vlachos, D. Valougeorgis
First School of Fusion Science & Technology - Volos 16-21 May 2002
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Nikolaos Andritsos
Associate Professor
Experimental Transport Phenomena
Research Interests and Activities
Research interests include the flow of two-phase mixtures in pipelines, the
formation and control of scale deposits in industrial systems (heat exchangers,
geothermal water equipment, oil and gas transportation systems, RO and UF
membrane systems etc.), water conservation and water recycling in industrial
systems, exploitation of geothermal energy (including geoexchange systems) and
stone deterioration and conservation.
Present research projects focus on the following areas:
(1) A better understanding of two-phase flows and particularly: (i) effect of fluid
properties on the gas-liquid flow in a horizontal and near-horizontal pipeline. The
construction of a vertical pipeline is also underway. (ii) Effect of drag-reducing
polymers on two-phase flow characteristics. The above projects have been partially
funded by a PYTHAGORAS Project (GSRD) and the ONASION Foundation through a
scholarship.
Dr Andritsos received his Diploma in
Chemical Engineering from AUTh in
1979, his M.Sc. from University of
Manchester (U.K.) in 1981 and his
Ph.D. in Chemical Engineering from
the University of Illinois at UrbanaChampaign (USA). He joined the
faculty at Volos in 2003. Before
joining the Department, he was
affiliated with the Chemical Process
Engineering Research Institute in
Thessaloniki for 16 years.
(2) The development of suitable strategies and a design methodology for water
minimization and reuse in selected textile industries in the Region of Thessaly in
order to reduce water costs and to comply with national and EC wastewater and
other directives. The project is funded by the GSRD and the EC through the Regional
Innovation Pole of Thessaly.
Selected Publications
CaCO3 deposits on an RO membrane.
Tzotzi, C., Pahiadaki, T., Andritsos, N., Yiantsios, S.G. and Karabelas, A.J. An
experimental study of CaCO3 scaling of RO and NF membranes in cross-flow
filtration. J. Membrane Sci., 296, pp. 171–184, 2007.
Kelessidis, V.C., Karydakis, G. and Andritsos, N. Flow production characteristics of
low-enthalpy geothermal artesian wells and analysis for a better design of future
well drilling parameters. Geothermics, 36, pp. 243-264, 2007.
Spanos, N., Patis, Α., Kanellopoulou, D., Andritsos, N. and Koutsoukos, P.G.
Precipitation of calcium phosphate from Simulated Milk Ultra-Filtrate solutions.
Crystal Growth & Design, 7, pp. 25-29. 2007.
Andritsos, Ν. and Karabelas, A.J. Calcium carbonate scale formation in the presence
of particles. Int. J. Heat Mass Transfer, 46, pp. 4629-4638, 2003.
Fytikas, M. and Andritsos, N. Geothermal Energy – Geothermal Resources,
Geothermal Fluids, Applications, Environment. Tziolas Editions, Thessaloniki,
Greece (2004). [In Greek]
Contact
Tel.: +30-24210-74072, Fax: +30-24210-74085
E-mail: nandrits@uth.gr, website: http://www.mie.uth.gr/Andritsos.html
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Nikolaos Aravas
Professor
Computational Mechanics of Structures
Research Interests and Activities
Professor Aravas’ research is in the areas of Mechanics of Materials, Computational
Mechanics and Finite Element Methods, Plasticity, Fracture Mechanics, Metal
Forming, Continuum Mechanics, and Biomechanics.
In particular, Prof. Aravas has worked on the development of crack-tip asymptotic
solutions in ductile materials, the analysis of testing methods for material interfaces
such as the peel test, the development of numerical methods for the integration of
elastoplastic models, on constitutive models for the anisotropic plastic behavior of
polymers and the plasticity and creep of metal-matrix composites reinforced by
continuous aligned fibers, on strain-gradient elasticity and plasticity theories with
applications in nano-materials, the mechanics of Transformation Induced Plasticity
(TRIP), the mechanics of metal forming, and the mechanics of the human foot.
Recent research projects focus on the following areas:
Dr Aravas received his Diploma in
Mechanical Engineering from the
Aristotle Univeristy of Thessaloniki in
1980, his M.Sc. (1982) and Ph.D.
(1985) in Theoretical and Applied
Mechanics from the University of
Illinois at Urbana Champaign (USA).
He joined the faculty at Volos in
1996. Before joining the
Department, he was a Professor of
Mechanical Engineering and Applied
Mechanics at the University of
Pennsylvania (USA) (1986-1996),
and a Senior Engineer at Hibbitt,
Karlsson & Sorensen (1985), the
developers of the ABAQUS generalpurpose finite element program. At
the University of Thessaly Prof.
Aravas has served as Vice Rector
for Research and Development
(1999-2002) and Dean of
Engineering (2004-2007). Professor
Aravas is currently the Director of
the Mechatronics Institute
(IMTRONICS) at the “Centre for
Research and Technology Thessaly” (CE.RE.TE.TH.).
(1) A research effort combining state-of-the-art modeling and simulation with
experiment is used to characterize damage, constitutive response, and fracture in
solid propellant materials. The integrated effort relies upon detailed electron
microscopy studies of particle dewetting and in situ crack propagation along with
systematically acquired experimental data in conjunction with inverse methods and
systematic fracture toughness testing of cracked geometries to understand the
failure mechanisms. The principles of mechanics of materials along with finite
element methodology are used to investigate and characterize the mechanical
response of a solid propellant under both static and dynamic loadings. This work is
carried out in collaboration with faculty of the Department of Mechanical Science
and Engineering of the University of Illinois at Urbana Champaign and is supported
by the “Center for Simulation of Advanced Rockets” funded by the U.S. Department
of Energy.
(2) Theories with intrinsic-length-scales find applications in the modeling of sizedependent phenomena. In elasticity, length scales enter the constitutive equations
through the elastic strain energy function, which, in this case, depends not only on
the strain tensor but also on gradients of the rotation and strain tensors. A “mixed”
finite element formulation is developed, in which both the displacement and the
displacement-gradients are used as independent unknowns and their relationship is
enforced in an “integral sense”. The proposed technique is applied to a number of
problems in the areas of nano-materials and textile products. The project is funded
by the GSRD and the EC through the Regional Innovation Pole of Thessaly.
Selected Publications
Aravas, N., Laspidou C.S., On the calculation of the elastic modulus of a biofilm
streamer. BIOTECHNOLOGY AND BIOENGINEERING 101, 196-200, 2008.
Xu F, Aravas N, Sofronis P., Constitutive modeling of solid propellant materials with
evolving microstructural damage. J. MECHANICS & PHYSICS OF SOLIDS 56, 20502073, 2008
Xu F., Sofronis P., Aravas N., et al. Constitutive modeling of porous viscoelastic
materials. EUROPEAN J. MECHANICS A-SOLIDS 26, 936-955, 2007
Haidemenopoulos G.N., Katsamas A.I., Aravas N., Stability and constitutive modelling
in multiphase TRIP steels. STEEL RESEARCH INTERNATIONAL 77, 720-726, 2006.
Papatriantafillou I., Agoras M., Aravas N., et al. Constitutive modeling and finite
element methods for TRIP steels. COMPUTER METHODS IN APPLIED MECHANICS
AND ENGINEERING 195, 5094-5114, 2006.
Contact
Tel: +30-24210-74002, Fax: +30-24210-74009
E-mail: aravas@uth.gr, website: http://www.mie.uth.gr/Aravas.html
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Vasilis Bontozoglou
Professor
Transport Phenomena – Process Equipment
Research Interests and Activities
Research interests include the flow of liquids with a free surface and the analysis of
related heat and mass transfer phenomena. Also, the study of diffusion in
heterogeneous solids and liquids.
Representative research projects are the following:
(1) Gravity-driven film flows are central to a variety of process equipment. The
objective of this project is to understand the complex dynamics of the free surface
with increasing flow rate, which includes development and interactions of solitary
waves, transition to three-dimensional instabilities and finally establishment of
interfacial turbulence. Our experiments are done in a large inclined facility and rely
predominantly on optical measuring techniques. Direct numerical simulations are
also undertaken, based on the finite-element method.
Dr Bontozoglou received a Diploma
in Chemical Engineering from AUTh
(1982), and MSc (1986) and PhD
(1988) from the University of Illinois
at Urbana-Champaign (USA). Before
joining the faculty of the University of
Thessaly in 1993, Dr Bontozoglou
was affiliated for 4 years with the
Chemical Process Engineering
Research Institute in Thessaloniki.
He is presently Director of the
Laboratory of Transport Processes
& Process Equipment, and serves
as national representative in
EuroTherm Committee for the
advancement of Thermal Sciences
in Europe.
(2) The geometrical characteristics of the solid wall bounding a liquid film may
profoundly affect the flow behavior. These effects are important in film coating and
also as a means of enhancement of heat/mass transfer rates in process equipment.
We study resonance phenomena triggered by periodic corrugations and strong
localized modifications of the flow caused by isolated topography. Again,
experiments are combined with numerical simulations.
(3) Bubble growth from a liquid solution occurs in numerous industrial applications.
The fundamental interaction between diffusion and growth-induced convection is
masked by natural convection phenomena. Thus, this project performs experiments
in zero-gravity (ESA) and investigates the growth of bubbles from a locally supersaturated liquid. Interpretation of the observations is assisted by semi-analytical and
numerical solution of models of growing complexity (collaboration with the Dept of
Chemistry, University of Thessaloniki.
Selected Publications
Bontozoglou, V., Serifi, K., Falling film flow along steep two-dimensional
topography: The effect of inertia. Int. J. Multiphase Flow, 34, 734-747, 2008.
Wierschem, A., Bontozoglou, V., Heining, C., et al. Linear resonance in viscous films
on inclined wavy planes. Int. J. Multiphase Flow, 34, 580-589, 2008.
Divinis, N., Karapantsios T.D., de Bruyn R., Kostoglou, M., Bontozoglou, V., Legros,
J.C., Lateral motion and interaction of gas bubbles growing over spherical and
plate heaters. Microgravity Sci. & Technology, 18, 204-209, 2006.
Argyriadi, K., Vlachogiannis, M. & Bontozoglou, V. Experimental study of inclined
film flow along periodic corrugations: The effect of wall steepness. Phys. Fluids,
18, 012102:1-15, 2006.
Tihon, J., Serifi, K., Argyriadi, K. & Bontozoglou, V. Solitary waves on inclined films:
Their characteristics and the effects on wall shear stress. Exp. Fluids, 41, 79-89,
2006.
Contact
Tel: +30-24210-74069, Fax: +30-24210-74085
E-mail: bont@mie.uth.gr, website: http://www.mie.uth.gr/Bontozoglou.html
12
Gregory N. Haidemenopoulos
Professor
Physical Metallurgy-Alloy Design
Research Interests and Activities
Structure-Processing-Properties-Performance interactions in metallic materials.
Application of computational alloy thermodynamics and kinetics in alloy design and
simulation of heat treatments and welding processes. Hydrogen trapping and
embrittlement in high-strength aluminium alloys. Microstructure, Mechanical
Properties and Corrosion of Magnesium Alloys.
Research activities are focused on the following projects:
[1] Design of bainite in steels from homogeneous and inhomogeneous microstructures using physical approaches (RFCS Project 2007-2010).
Extensive use of computational thermodynamics and kinetics for the development of modelling
approaches for the bainitic transformation in steels. These approaches will be placed on a
broader basis and will be fitted to new experimental data. So the development of bainitic
microstructures in complete groups of modern bainitic- and cold rolled TRIP-, CP-, and DPsteels can be calculated. The use of the new approach will allow designing bainitic structures
for improved material properties and will give information about basic physical processes
governing the formation of bainite.
Dr Haidemenopoulos received his
Diploma in Mechanical Engineering
in 1982 from AUTh and his Ph.D. in
Physical Metallurgy from
Massachusetts Institute of
Technology (MIT), USA, in 1988. He
joined the faculty at Volos in 1992.
[2] Aeronautical Application of Wrought Magnesium-AEROMAG (STREP Project 20052008)
The technical focus of the program is the development of new Magnesium wrought products
(sheets and extrusions), that provide significantly improved static and fatigue strength
properties. The strength properties of these innovative materials are required to be as high as
AA5083 for non-structural applications and as high as AA2024 aluminium alloys for secondary
structure applications. Appropriate manufacturing (rolling, extrusion), forming and joining
technologies require development, simulation and validation for the innovative material and
application. Corrosion is a problem to be solved with newly adapted and environmentally
friendly surface protection systems and advanced design concepts. Flammability will be
addressed with addition of chemical elements and special surface treatments. A further
essential task is the development of material models and failure criteria for the prediction of
forming processes, plastic deformation and failure behaviour of components.
[3] Design of new high-strength Al-Mg alloys with additions of Zr and Sc (PAVE
Project 2006-2008)
The objective of this research project is the strength improvement of thick sheets at the as
hot-rolled state. For the fabrication of such alloys, the influence of the alloying elements Zr
and Sc on microstructure, microsegregation, homogenization, mechanical properties and
corrosion resistance is to be evaluated.
Selected Publications
G.N. Haidemenopoulos, A. Katsamas and A. Aravas, Multiscaling Effects in TRIP
Steels, in Multiscaling in Molecular and Cintinuum Mechanics: Interaction of
Time and Size from Macro to Nano, ed. G. Sih, Springer, 2007.
H. Kamoutsi, G.N. Haidemenopoulos, V. Bontozoglou and S. Pantelakis, CorrosionInduced Hydrogen Embrittlement in Aluminum Alloy 2024, Corrosion Science, 48,
1209-1224, 2006.
I. Papatriantafillou, M. Agoras, N. Aravas and G.N. Haidemenopoulos, Constitutive
Modeling and Finite Element Methods for TRIP Steels, Computer Methods in
Applied Mechanics & Engineering, 195, 5094-5114, 2006.
G.N. Haidemenopoulos, A. Zervaki, P. Terezakis, J. Tzanis, A.E. Giannakopoulos,
Investigation of Rolling Contact Fatigue Cracks in a Grade 900A Rail Steel of a
Metro Track, Fatigue and Fracture of Engineering Materials and Structures, 29,
887-900, 2006.
G.N. Haidemenopoulos, A.I. Katsamas, N. Aravas, Stability and Constitutive Modelling
in Multiphase TRIP Steels (invited paper), Steel Research Int., 77, No. 9-10, 720726, 2006.
Contact
Tel/Fax: +30-24210-74061
E-mail: hgreg@mie.uth.gr, website: http://www.mie.uth.gr/Haidemenopoulos.html
13
Spyros A. Karamanos
Assistant Professor
Structural Mechanics and Finite Elements
Research Interests and Activities
My research focuses on the development of Computational and Analytical Methods
for Stress Analysis, Structural Stability and Fatigue. Applications refer mainly to
Steel Structures, including Tubular Structures, Industrial Equipment (e.g. Tanks,
Pressure Vessels, Piping, Chimneys), Onshore and Marine Pipelines, Offshore
Structures, and Steel Bridges. Present research activities include:
(1) Buckling of steel cylindrical shells. Development of computational methods for
bifurcation and post-buckling response in shells with significant plastic
deformations. Special emphasis is given on pipelines, accounting of the
manufacturing process effect. Part of the work is directed towards improvement of
European Design Recommendations for shell stability.
(2) Buckling of elastic cylindrical and spherical shells, using numerical models for
simulating isotropic and anisotropic behaviour. Applications include typical thin
steel shells for industrial applications (tanks and chimneys), as well as biomechanics,
biomedical components and carbon nanotubes.
Dr Karamanos received his Diploma
in Civil Engineering (1989) from NTU
Athens with highest honors, his
M.Sc. (1991) and his Ph.D. (1993) in
Structural Engineering from The
University of Texas at Austin (USA).
He joined the faculty at Volos in
1999. Before joining the
Department, he was affiliated with
EGNATIA ODOS AE in
Thessaloniki, Greece, as a structural
engineer, and with Delft University of
Technology, The Netherlands, as a
Post-Doctoral Fellow in Steel
Structures.
(3) Fatigue of high-strength steel welded connections, for marine structures,
pipelines and risers, as well as for steel bridges. The work is experimental and
analytical, aimed at developing new design tools for welded high-strength steel
connections.
(4) Analysis and design of steel structures under severe earthquake loading. Special
issues, such as the effect of material variability as well as retrofitting of existing
structures with steel components, are investigated.
(5) Structural assessment and “fitness-for-purpose” of industrial structures (tanks,
pressure vessels, piping, chimneys) and buried pipelines (water, oil and gas) under
severe loading, with emphasis on earthquake action.
The above research activities are funded mainly by the European Union, and meritbased research scholarships from Greek Scholarship Foundations
Selected Publications
Dama E., Karamanos, S. A., and Gresnigt A. M. Failure of Locally Buckled Pipelines.
Journal of Pressure Vessel Technology, ASME, 129, pp. 272-279, 2007.
Patkas, L. A. and Karamanos, S. A. Variational Solutions of Liquid Sloshing in
Horizontal-Cylindrical and Spherical Containers. Journal of Engineering
Mechanics, ASCE, 133, pp. 641-655, 2007.
Houliara, S. and Karamanos, S. A., Buckling and Post-Buckling of Pressurized ThinWalled Elastic Tubes Under In-Plane Bending. Int. Journal of Nonlinear
Mechanics, 41, pp. 491-511, 2006.
Karamanos, S. A., and Andreadakis, K. P., Denting of Internally Pressurized Tubes
Under Lateral Loads. Int. J. Mechanical Sciences, 48, pp. 1021-1196, 2006.
Karamanos, S. A., Romeijn, A. and Wardenier, J. Stress Concentrations in Multiplanar Tubular DT-Joints for Fatigue Design. Journal of Structural Engineering,
ASCE, 126, pp. 1320-1330, 2000.
Contact
Tel: +30-24210-74086, Fax: +30-24210-74012.
E-mail: skara@uth.gr, website: http://www.mie.uth.gr/karamanos.html
14
Alexis Kermanidis
Lecturer
Mechanical Behavior of Metallic Materials
Research Interests and Activities
Mechanical behaviour of metallic materials and experimental procedures in the
topics of fatigue and fracture. Fatigue crack growth analysis/prediction under
constant and irregular loading conditions. Effect of corrosion on the mechanical
performance of materials. Relevant research project he has been involved in:
[1] WELAIR , CEC 2004-2007 “Development of short distance WELding concepts for
AIRframes” The goal is to develop short distance welding concepts to control the
run-in and outs and additionally, to improve the damage tolerance behaviour
through the optimisation of the weld quality, the use of new high performance
aluminium alloys or new joint configurations suitable for short distance welded
airframe components. Partners: Airbus EADS , Piaggio, GKSS ONERA DassaultAviation, UPatras etc.
Dr Kermanidis received his Diploma
in Civil Engineering in 1996 and his
Ph.D. in Mechanical Behaviour of
Materials from University of Patras in
2003. He joined the faculty at Volos
in 2007.
[2] IDA, CEC 2002-2004 ‘Investigation on Damage Tolerance of Aircraft Aluminium
Alloys’. The aim was to establish a comprehensive understanding of the
microstructure vs. fatigue crack growth-relationship primarily in 2024 Al-Alloy sheet
sheet and plate. Very limited work was conducted on 6056 LBW butt-joints, FSW was
addressed. Recommendations were provided in order to design improved materials
with respect to damage tolerance properties. Assessment of damage tolerance was
performed with new crack growth prediction models based on the microstructural
features investigated. Partners: EADS CRC-F EADS CRC-D, ALENIA, Pechinet,
University of Limerick, UPatras etc
[3] ‘Corrosion and Hydrogen Embrittlement of Aircraft Aluminum Alloys’, PENED,
1998-2000. Partners: University of Thessaly, University of Patras, Hellenic Aerospace
Industry. The objective of the research is to investigate hydrogen uptake and
trapping during corrosion of Al-alloys. The effect of hydrogen trapping was
quantified with tensile, fracture toughness and fatigue testing.
Selected Publications
C. Rodopoulos and Al. Th. Kermanidis, Understanding the Effect of Block Overloading
on the Fatigue Behaviour of 2024-T351 Aluminium Alloy Using the Fatigue Damage
Map. International Journal of Fatigue, 29, pp. 276–288, 2007.
Al.Th. Kermanidis, P.V. Petroyiannis and Sp.G. Pantelakis, Fatigue and Damage
Tolerance Behaviour of Corroded 2024 T351 Aircraft Aluminum Alloy. Theoretical
and Applied Fracture Mechanics, 43, pp. 121-132, 2005.
J. Z. Zuo, Al. Th. Kermanidis, Sp. G. Pantelakis, Strain Energy Density Prediction of
Fatigue Crack Growth from Hole of Aging Aircraft Structures. Theoretical and
Applied Fracture Mechanics, 38, pp. 37-51, 2002.
Al. Th. Kermanidis, Sp. G. Pantelakis, Fatigue Crack Growth Analysis of 2024 T3
Aluminum Specimens Under Aircraft Service Spectra. Fatigue and Fracture of
Engineering Materials and Structures, 24, pp. 699-710, 2001.
Contact
Tel: +30-24210-74014, Fax: +30-24210-74009
E-mail: akermanidis@mie.uth.gr
15
George Kozanidis
Lecturer
Optimization Methods in Production/Service Systems
Research Interests and Activities
Operations Research: Integer Programming, Design and Analysis of Optimization
Algorithms, Stochastic control of production/transportation systems, Multiobjective
Optimization.
Currently undergoing research focuses on:
1. Flight and maintenance planning of mission aircraft for maximum fleet
availability (with A. Gavranis and G. Liberopoulos). Our aim is to design, develop and
apply scientific tools (mathematical programs, optimization algorithms, simulation
models, etc.) for addressing the problem of producing an optimal flight and
maintenance plan that maximizes the availability of a unit of aircraft over a given
planning horizon. The goal is to integrate these tools into an online decision support
system that will enable the user to enter a specific instance of this problem and
combine them in order to solve it. The problem arises in several real applications,
such as planning for military aircraft, fire-fighting aircraft, rescue helicopters, etc.
Dr Kozanidis holds a Diploma from
the University of Thessaly in Greece
(1997), a MSc from Boston
University in USA (1998) and a MSc
and a PhD, both from Northeastern
University in USA (2002). Between
2004 and 2007 he was an Adjunct
Professor and a Postdoctoral
Researcher at the Department. He
joined the faculty as a Lecturer in
2007.
2. Optimal production scheduling in a chemical industry (with G. Liberopoulos and
O. Hatzikonstantinou). We address the problem of compiling an optimal production
schedule for a chemical plant that produces several different grades of final
product. Our aim is to issue a production schedule that minimizes the cost
associated with the number of grade changeovers, due to the fact that such changes
result in low quality intermediate products with undesirable variations.
Selected Publications
Kozanidis, G., A multiobjective model for maximizing fleet availability under the
presence of flight and maintenance requirements. Journal of Advanced
Transportation, accepted, 2009.
Kozanidis, G., Solving the linear multiple choice knapsack problem with two
objectives: profit and equity. Computational Optimization & Applications, in
press, 2009.
Kozanidis, G., Gavranis, A., Liberopoulos, G., Heuristics for maximizing fleet
availability subject to flight and maintenance requirements. Proceedings of the
10th International Conference on Application of Advanced Technologies in
Transportation, Athens, Greece, May 27-31, 2008.
Liberopoulos, G., Kozanidis, G., Tsarouhas, P., Performance evaluation of an
automatic transfer line with WIP scrapping during long failures. Manufacturing &
Service Operations Management, 9 (1), 62-83, 2007.
Kozanidis, G., Melachrinoudis, E., A branch & bound algorithm for the 0-1 mixed
integer knapsack problem with linear multiple choice constraints. Computers &
Operations Research, 31, 695-711, 2004.
Contact
Tel: +30-24210-74057, Fax: +30-24210-74059
E-mail: gkoz@mie.uth.gr, website : http://www.mie.uth.gr/kozanidis.html
16
George Liberopoulos
Professor
Production Management
Research Interests and Activities
Our research interests are in the area of production & operations management,
operations research, applied probability and automatic control.
Some of our current research projects are:
Quantitative Analysis of the Impact of Stockouts in Inventory Management. The aim
of this research is to quantify the effect of the loss of customer goodwill following a
stockout. To this end, we look at newsvendor-type models of several suppliers that
compete for customer goodwill based on past product availability. For such models,
we formulate the problem of finding optimal stationary ordering policies for the
suppliers at Nash equilibrium as a stochastic dynamic game. The project is funded by
Greece’s Ministry of Education through a HERAKLITUS grant.
Dr Liberopoulos received his B.S.
and M. Eng. in Mechanical
Engineering from Cornell University
(USA) in 1985 and 1986,
respectively, and his Ph.D. in
Manufacturing Engineering from
Boston University (USA) in 1993. In
1993 he was a Lecturer in the
Department of Manufacturing
Engineering at Boston University,
and during 1994-1996 he was a
Visiting Scientist in Laboratoire d’
Informatique at Université Pierre et
Marie Currie (France). In 1996, he
joined the Department of Mechanical
Engineering at the University of
Thessaly, where he is currently
Professor of Production
Management and Director of the
Production Management Laboratory.
Modeling Greece’s Electricity Market. Electricity market deregulation has triggered a
number of significant changes in Greece’s energy sector, mostly by allowing privateowned companies to become producers and suppliers of electricity. This research
examines the Day-Ahead-Scheduling (DAS) program recently introduced by the new
“Grid Control and Power Exchange Code for Electricity” which forms the basis of the
wholesale electricity market operation. DAS aims at minimizing the total cost of
serving energy load for the next day, under conditions of good and safe system
operation, while ensuring adequate reserves. The project is funded by Greece’s
Regulatory Authority for Energy.
Optimal Production Scheduling for Minimum Product Grade Changeovers in Chemical
Process Industries. We study the problem of production scheduling of a chemical
plant that produces several different grades of the same type of product. The final
products are stored in a number of outbound silos. From there, they are either
loaded onto silo trucks or bulk containers or they are packed into big bags and then
stored into a warehouse before being delivered to customers. The goal is to
minimize the number of grade changeovers, because such changes result in the
production of a quality-inferior product. The project is funded by the GSRT and VPI
S.A. through a PENED grant.
Selected Publications
Liberopoulos G. On the tradeoff between optimal order-base-stock levels and
demand lead-times. European Journal of Operational Research, 190, 136-155
2008.
Liberopoulos, G., Kozanidis, G., Tsarouhas, P. Performance evaluation of an
automatic transfer line with WIP scrapping during long failures. Manufacturing &
Service Operations Management, 9 (1), 62-83, 2007.
Koukoumialos, S., Liberopoulos, G. An analytical method for the performance
evaluation of echelon kanban control systems. OR Spectrum, 27 (2-3), 339-368,
2005.
Liberopoulos, G., S. Koukoumialos. Tradeoffs between base stock levels, numbers of
kanbans and production lead times in production-inventory systems with advance
demand information. International Journal of Production Economics, 96 (2), 213232, 2005.
Karaesmen, F., G. Liberopoulos, Y. Dallery. The value of advance demand
information in production/inventory systems. Annals of Operations Research, 126
135-157, 2004.
Contact
Tel: +30-24210-74056, Fax: +30-24210-74059
E-mail: glib@uth.gr, website: http://www.mie.uth.gr/Liberopoulos.html
17
Pandelis Dimitris
Assistant Professor (elect)
Stochastic Models of Operations Research in Industrial Management
Research Interests and Activities
His research interests are in the areas of applied probability theory, stochastic
optimization, queueing networks, flexible manufacturing systems, and scheduling
and resource allocation problems.
Dr. Pandelis his diploma in Naval
Architecture and Marine Engineering
from the National Technical
University of Athens in 1987 and his
M.Sc. and Ph.D degrees in Electrical
Engineering: Systems from the
University of Michigan in 1990 and
1994 respectively. After his doctoral
studies he worked in the USA as a
Research Scientist for ERIM
International (1994-2000) and
Tellabs Operations (2000-2001). He
was an Instructor in the Department
of Mechanical Engineering of the
University of Thessaly from 2003 to
2008, when he was elected
Assistant Professor of Stochastic
Models of Operations Research in
Industrial Management.
Selected Publications
Pandelis, D.G. Optimal control of flexible servers in two tandem queues with
operating costs. Probability in the Engineering and Informational Sciences, 22, 107131, 2008.
Pandelis, D.G. Optimal preemptive scheduling on uniform machines with discounted
flowtime objectives. European Journal of Operational Research, 177, 630-637,
2007.
Pandelis, D.G. and Teneketzis, D. On the optimality of the Gittins index rule for multiarmed bandits with multiple plays. Mathematical Methods of Operations Research,
50-3, 449-461, 1999.
Pandelis, D.G. and Teneketzis, D. A simple load balancing problem with decentralized
information. Mathematical Methods of Operations Research, 44-1, 97-113, 1996.
Pandelis, D.G. and Teneketzis, D. Optimal multiserver stochastic scheduling of two
interconnected priority queues. Advances in Applied Probability, 26, 258-279,
1994.
Contact
Tel: +30-24210-74…., Fax: +30-24210-74….
E-mail: ………..@uth.gr, website : http://www.mie.uth.gr/.................html
18
Costas Papadimitriou
Professor
Structural Dynamics
Research Interests and Activities
Research interests include probabilistic structural dynamics, structural identification
and health monitoring, finite element model validation and updating, structural
damage diagnosis and lifetime prognosis, sensor density and topology optimisation,
Bayesian inference for uncertainty quantification, stochastic simulation methods for
uncertainty propagation in structural mechanics, structural reliability, stochastic
fatigue, design optimization under uncertainty.
Representative research projects are the following:
[1] Earthquake Protection of Bridges (2003-2007). Funding: Greek Secretariat of
Research and Technology. Partners: Consortium of Greek Universities, Institutes and
Companies.
Dr. Papadimitriou received his
Diploma in Mechanical Engineering
in 1984 from the University of
Patras and his MSc and PhD degrees
from California Institute of
Technology (CalTech) in 1985 and
1990, respectively. He joined the
department in 1999 as an Adjunct
Professor and the faculty in 2000 as
an Associate Professor. Before
joining the Department, he served
as faculty member at Texas A&M
Univ. (1991-1994) and as visiting
faculty at CalTech (1994-1995,
1996-1998). He also held research
positions at Hong Kong University of
Science and Technology (1995-1996)
and at Jet Propulsion LaboratoryJPL (1996-1998).
The objective of our group is to develop and test analytical methodologies for diagnostic
monitoring of bridge integrity using vibration measurements. Emphasis is given to the
automation of a smart data processing system for continual, on-line, global and comprehensive
structural health monitoring. Specifically, the following methods are developed and integrated
into a software tool:
• Modal Identification methods using ambient/earthquake excitations
• Optimal experimental design methodologies for model identification and for response
reconstruction at unmeasured locations
• Sophisticated damage detection tools based on finite element model updating and
probabilistic methods accounting for modeling and data processing uncertainties
• Robust global optimization tools needed in modal identification, model updating, damage
detection and optimal sensor location methods
• Validation with small-scaled laboratory and full-scale field test experiments
[2] Dynamic Response and Design Optimisation of Vehicle Structures (2005-2009).
Funding: Greek General Secretariat of Research and Technology. Partners: Aristotle
University of Thessaloniki
The project aims at the development of methodologies for (a) investigating the nonlinear
dynamic response of vehicle structures with nonlinear suspensions (b) validating and updating
the vehicle models using vibration measurements, and (c) optimizing the vehicle design under
loading and structural uncertainties. Linear and nonlinear models for the substructures are
considered. Performance indices are introduced that take into account structural safety
considerations (e.g. fatigue), ride performance and passenger comfort. Uncertain road profiles
as well as structural uncertainties are incorporated in the methodology and appropriate
solutions techniques are developed to solve the computationally time consuming design
optimization problem.
Selected Publications
Ntotsios, E., Papadimitriou, C., Panetsos, P., Karaiskos, G., Perros, K., Perdikaris,
P.C., Bridge Health Monitoring System based on Vibration Measurements. Bulletin
of Earthquake Engineering, DOI 10.1007/s10518-008-9067-4, 2008.
Christodoulou, K., Ntotsios, E., Papadimitriou, C., Panetsos, P., Structural Model
Updating and Prediction Variability using Pareto Optimal Models. Computer
Methods in Applied Mechanics and Engineering, 198, 138–149, 2008.
Christodoulou, K., Papadimitriou, C., Structural Identification Based on Optimally
Weighted Modal Residuals. Mechanical Systems and Signal Processing, 21, 4-23,
2007.
Papadimitriou, C., Pareto Optimal Sensor Locations for Structural Identification.
Computer Methods in Applied Mechanics and Engineering, 194(12-16), 1655-1673,
2005.
Papadimitriou, C., Beck J.L., Katafygiotis, L.S., Asymptotic Expansions for Reliability
and Moments of Uncertain Systems. Journal of Engineering Mechanics, ASCE,
123(12), 1219-1229, 1997.
Contact
Tel: +30-24210-74006, Fax: +30-24210-74012
E-mail: costasp@uth.gr, website : http://www.mie.uth.gr/Papadimitriou.html
19
Thanasis Papathanasiou
Associate Professor
Processing of Polymers and Composites
Research Interests and Activities
My interests revolve around the investigation of processing-structure-property
relationships in heterogeneous materials. Processes of interest involve flow of
heterogeneous mixtures into complex cavities or channels (injection molding,
extrusion) or through fibrous media of complex internal structure (liquid molding,
pultrusion). Central to our approach is the use of parallel computation to investigate
the influence of microstructure on the details of the flow fields (processingmicrostructure correlations) as well as on the details of concentration, thermal or
stress fields (microstructure-property correlations). Our computations are carried
out on very complex geometries, whose features are inspired by those of
commercial composite materials using large-area automated microscopy.
Quantification of these microstructures, whether obtained from digital micrographs
or synthetically generated using algorithms such as RSA or Monte-Carlo, is carried
out using nearest neighbor functions, variants of Ripley’s K-function as well as linear
path functions.
Current projects include:
Dr Papathanasiou received his
Diploma in Chemical Engineering
from NTUA in 1985, his MSc in
Chemical Engineering from the
University of Calgary (1987) and his
PhD from McGill University (1991) in
Canada. He joined the ME Faculty
at Volos in 2008. Prior to this, he
was Associate Professor of
Chemical Engineering at the
University of South Carolina, USA,
Unilever Lecturer in Process
Engineering at Imperial College,
London, UK (1992-1997), Director’s
Post-Doctoral Fellow at Los Alamos
National Laboratory, USA (19911992) and Research Scientist at
ALCAN Intl. R&D Center in
Kingston, Canada. He received an
European International Integration
Grant in 2007.
Micro-Scale Flows in Fibrous Media: We are interested in the computational investigation
of flow patterns in fibrous media of complex internal structure, such as those encountered in
liquid molding of high performance composites, and the determination of how such patterns
are affected by the microstructural details of these media. Both Stokes’ and finite Reynoldsnumber flows are considered. An immediate objective is the development of quantitative
models for the effective permeability of fibrous media as function of microstructural
parameters. This involves differentiating between various hard-core arrays (currently lumped
together under the heading "random") as well as identifying the exact point in microstructure
evolution at which a fibrous medium's resistance to flow is significantly affected by clustering.
A large part of this effort involves proposing and testing microstructural metrics that correlate
with the observed trends in permeability. This research is currently funded by an EU IRG grant.
Transport across filled systems. We are using high performance computing based on the
Boundary Element Method to investigate the manner in which the efficacy of filled systems is
affected by their internal structure. Systems of interest include flake-filled membranes and
particulate composites in which the particulate phase shows various degrees of aggregation. An
example of heat transfer across a particulate system containing 10,000 individual particles, the
aggregation state of which is determined by the parameters of the NVT-MC algorithm used in its
generation, is shown in the attached figure, in which the temperature contours within a subsection are shown in the insert. Concentration contours for diffusion across a material filled
with impermeable flakes of random orientation are shown in the figure to the right.
Selected Publications
Chen, X. and Papathanasiou, T.D. Micro-Scale Modeling of Axial Flow through
Unidirectional Disordered Fiber Arrays. Composites Science and Technology, 67,
1286-1293, 2007.
Chen, X. and Papathanasiou, T.D. On the variability of the Kozeny constant for
saturated flow across unidirectional, disordered, fiber arrays. Composites Part A:
Manufacturing and Applied Science, 37(6), 836-846, 2006.
Bijeljic, B., Mantle, M.D., Sederman, A.J., Gladden, L.F. and Papathanasiou, T.D.
Slow flow across macroscopically semi-circular fibre lattices and a free flow
region of variable width - visualisation by magnetic resonance imaging. Chemical
Engineering Science, 59(10), pp. 2089-2103, 2004.
Papathanasiou, T.D. and Guell, D.C. (Eds.), Flow-Induced Alignment in Composite
Materials. ISBN 1 85573 254 8, Woodhead Publishing Ltd., Cambridge, UK, 1997.
Ingber, M.S. and Papathanasiou, T.D. A Parallel-Supercomputing Investigation of the
Stiffness of Aligned, Short-Fiber-Reinforced Composites using the Boundary
Element Method. Int. J. Numerical Methods in Engineering, 30, pp. 3477-3491,
1997.
Contact
Tel/Fax: +30-24210-74016/24210-74085
E-mail: athpapathan@mie.uth.gr
20
Nikos Pelekasis
Associate Professor
Computational Fluid Dynamics
Research Interests and Activities
Dynamics and stability of films and interfaces in stratified and dispersed flow.
Bubble and drop dynamics in the presence of inertia, capillary and elastic forces.
Biomechanics. Magnetohydrodynamic stability. Numerical Techniques, Finite
Elements, Boundary Elements and Parallelization. Bifurcation Theory & Dynamical
Systems.
Our present research projects focus on the following areas:
[1] Physiology of the motion and deformation of contrast agents subject to acoustic
disturbances: HRAKLEITOS Funding Organization: Ministry of Education of Greece.
Contrast agents are bubbles normally coated by a membrane in order to avoid
clustering and to prevent gas dissolution. Upon application of ultrasound they
exhibit strong scatter, which distinguishes them from tissue and allows for better
flow visualization. Proper modelling of the membrane viscoelastic behaviour along
with stability analysis and numerical simulations of their interaction with the
external flow, allows for their characterization and optimal design for improved
diagnostic and drug delivery modalities.
Dr Pelekasis received his Diploma
from NTUA in 1986 and his Ph.D.
from the State University of New
York at Buffalo (USA) in 1991. He
joined the faculty at Volos in 2001.
Before joining the Department he
was affiliated with the Chemical Eng.
Dept. of the Univ. of Patras (19972001) and the Levich Institute for
Physicochemical Hydrodynamics in
CCNY (1992-1994).
[2] Effect of rainfall on the flight characteristics of an airfoil: PENED Funding
Organization: Greek Secretariat of Research and Technology. The dynamic
development of liquid films due to shear from the surrounding boundary layer is
investigated, as is the case for flow past a wing section under rainfall conditions.
The theoretical and numerical study of such a flow field is intended to reveal the
way interfacial and Tollmien-Schlichting waves grow in space and time for both
linear and nonlinear disturbances and to capture their effect on boundary layer
separation and transition.
[3] Stability analysis of magnetohydrodynamic flows: EURATOM Funding
Organization: European Commission. A central issue in nuclear fusion is proper
removal of the excessive amount of heat that is generated. Thus, the core of the
reactor is surrounded by a mantle in which the refrigerating fluid is circulated. In
this region, normally consisting of a liquid crystal melt, an interesting coupling
between heat and momentum transfer takes place in the presence of the magnetic
field that is generated in the core. The stability of different operation modes is very
important for the optimal design of the reactor. 2d and 3d finite element analysis is
undertaken in order to ascertain the connectivity of different solution branches in
the parameter space defined by the Grashof and Hartmann numbers.
Selected Publications
K. Tsiglifis & N. Pelekasis, Non-Linear Oscillations and Collapse of Elongated Bubbles
Subject to Weak Viscous Effects: Effect of Internal Overpressure. To appear in
Physics of Fluids, 2007.
N. Pelekasis, Bifurcation Diagrams, Linear Stability Analysis and Dynamic Simulations
of Free Convection in a Differentially Heated Cavity in the Presence of a
Magnetic Field. Physics of Fluids, 18(3), pp. 1-23, 2006.
K. Tsiglifis & N. Pelekasis, Non-linear oscillation and collapse of elongated bubbles
subject to weak viscous effects. Physics of Fluids, 17(10), pp. 1-18, 2005.
E. Lac, D. Barthes-Biesel, N. Pelekasis & J. Tsamopoulos, Spherical capsules in threedimensional unbounded Stikes flows: effect of the membrane constitutive law
and the onset of buckling. J. Fluid Mech., 516, pp. 303-334, 2004.
N. A. Pelekasis, J. A. Tsamopoulos, Linear stability of a gas boundary layer flowing
past a thin liquid film that grows over a flat plate. J. Fluid Mech, 436, pp. 321352, 2001.
Contact
Tel: +30-24210-74102, Fax: +30-24210-74050
E-mail: pel@uth.gr, website: http://www.mie.uth.gr/Pelekasis.html
21
Georgios Petropoulos
Assistant Professor
Machining Process Technology
Research Interests and Activities
Research interests Theory and Technology of Machining (conventional and
unconventional) Processes, Machining of composite materials, Metrology, Tribology
(surface characterization, modelling of lubricated contacts)
Research projects carried out in the Laboratory of Manufacturing Processes are:
ƒ Multi parameter analysis and typology of engineering surface textures.
ƒ Machinability of polymers and composites
ƒ Correlation of corrosion resistance and machining process
ƒ Models of hydrodynamic and elastohydrodynamic lubrication
ƒ Tribological behaviour of coatings
Dr Petropoulos has received a B.Sc
in Physics and a Ph.D. in
Mechanical Engineering from the
Aristotle University of Thessaloniki,
Greece. He joined the faculty in
1996 and currently is Director of the
Manufacturing Processes
Laboratory.
Selected Publications
Marinkovic, A., Rosic, B. and Petropoulos, G. Analysis and optimization of
dynamically loaded porous metal sliding bearings under conditions of
elastohydrodynamic lubrication. Engineering Computations, 24, pp. 255-268,
2007.
Petropoulos, G., C.N. Pandazaras, N.M. Vaxevanidis and A. Antoniadis, Multiparameter identification and control of turned surface textures. Ιnternational
Journal of Advanced Manufacturing Technology, 29, pp. 118-128, 2006.
Hassiotis N.D. and G. P. Petropoulos, Influence of Surface Roughness on Corrosion
Resistance of Surfaces of Turned Carbon Steel Parts. International Journal of
Machining and Machinability of Materials, 1, pp. 202-212, 2006.
Petropoulos, G., Α. Τοrrance and C. Pandazaras ‘Abbott Curve Characteristics of
Turned Surfaces. International Journal of Machine Tools and Manufacture, 43,
pp. 237-243, 2003.
Pandazaras, C. and G. Petropoulos, A Computational Study of hydrodynamically
Lubricated Convex and Concave Journal Bearings. IMechE Journal of Engineering
Tribology, 215, pp. 425-429, 2001.
Contact
Tel: +30-24210-74064, Fax: +30-24210-74050
E-mail: gpetrop@mie.uth.gr, website : http://www.mie.uth.gr/Petropoulos.html
22
Tassos Stamatelos
Professor
Internal Combustion Engines
Research Interests and Activities
Internal combustion engines. Automotive exhaust treatment systems: design
optimization, control and diagnostics. Mathematical modeling of catalytic
converters and diesel filters. Design and simulation of HVAC systems, solar energy
systems, combined heat and power systems.
Industry- funded research projects carried out in the Lab include:
The Development and experimental validation of Computer Aided Engineering (CAE)
tools to support exhaust after-treatment systems design and optimization, in the
frame of a large envelope project aiming at the further development, customization
and experimental validation of in-house CAE software transferred to industrial
partners. System types addressed include Catalytic converters for SI engines, Diesel
oxidation catalytic converters, Diesel particulate filters, operated with catalystdoped fuel, (1D-3D), NOx adsorber catalysts for Gasoline Direct Injection and Diesel
engines.
Dr Stamatelos received his Diploma
in 1984 and his Ph.D. in Mechanical
Engineeringl in 1988 from Aristotle
University of Thessaloniki. He joined
the faculty at Volos in 1991.
Pre-processing and post processing is customized for MS Excel interface or MATLAB
Simulink environment. Code validation, experiment design and data acquisition,
quality assurance of experimental data and model identification procedures are
included. Innovative system versions that interfere with specialized patent literature
are also developed and investigated.
Activities with public funding include the Study of combustion and emissions in a
modern passenger car Diesel Engine with common rail fuel injection, fuelled by
Biodiesel fuel blends, and the Transient modeling of the performance of building
HVAC systems, conventional -vs- ground source heat pump - based.
Selected Publications
Konstantas, G.S. and A.M. Stamatelos, Modeling Three-way Catalytic Converters: An
effort to predict the effect of Precious Metal Loading. Proc Instn Mech Engrs,
Part D: J. Automobile Engineering, 221, pp. 355-373, 2007.
Pontikakis, G., A. Stamatelos, 3D Catalytic Regeneration Modeling of SiC Diesel
Particulate Filters. ASME Transactions, J Eng for Gas Turbines & Power, 128 (2),
pp. 421-433, 2006.
Stratakis, G.A. and A.M. Stamatelos, Flow Maldistribution Measurements in Wall-Flow
Diesel Filters. Proc Instn Mech Engrs, Part D -J Automobile Eng, 218, pp. 9951009, 2004.
Pontikakis, G.N., Konstantas, G.S. and A.M. Stamatelos, Three-Way Catalytic
Converter Modelling as a Modern Engineering Design Tool. ASME Transactions, J
Eng for Gas Turbines and Power, 126, pp. 906-923, 2004.
Stratakis, G.A. and A.M. Stamatelos, Thermogravimetric analysis of soot emitted by
a modern engine run on catalyst-doped fuel. Combustion and Flame, 132, pp.
157-169, 2003.
Contact
Tel: +30-24210-74067, Fax: +30-24210-74096
E-mail: stam@mie.uth.gr, website: http://www.mie.uth.gr/Stamatelos.html
23
Tassos Stamatis
Assistant Professor
Applied Thermodynamics – Thermal Power Stations
Research Interests and Activities
Thermodynamics, Heat Transfer and Gas Dynamics
of Gas Turbine Engines,
Modelling, Simulation and Diagnostics of Thermal Systems, methods of Diagnosis
based on Artificial Intelligence, Integrated Diagnostic Systems in Energy
installations, Parallel computers and algorithms. Currently, research is focused in
Cogeneration and Trigeneration Systems, Optimization in Thermal Systems Design
and Diagnostic Algorithms.
Dr Stamatis received his Diploma in
1982 and his Ph.D. in Mechanical
Engineering in 1990 from National
Technical University of Athens. He
joined the faculty at Volos in 2004.
Selected Publications
Stamatis A , Mathioudakis K., The influence of heat transfer effects on turbine
performance characteristics. ASME paper, GT2006-91039, 2006.
Mathioudakis K, Kamboukos Ph., Stamatis A., Gas turbine component fault detection
from a limited number of measurements. Proc. Instn Mech. Engrs, Part A: J.
Power and Energy, 21, pp 609-618 2004). [PE Publishing Award for the best paper
published in the journal in 2004.]
Aretakis N., Mathioudakis k., Stamatis A., Non-linear engine component fault
diagnosis from a limited number of measurements using a combinatorial
approach. ASME Journal of Engineering for Gas Turbine and Power, 125, pp. 642650, July 2003, also ASME paper GT-2002-30031, 2003. [Best paper award, of the
Controls and Diagnostics Committee of IGTI/ASME.]
Stamatis A., Kamboukos Ph., Aretakis N. Mathioudakis K., On board adaptive models:
A general framework and implementation aspects. ASME paper, 2002-GT-300622,
2002.
Mathioudakis K., Stamatis A., Bonataki E., Diagnosing the sources of overall
performance deterioration in CCGT Plants. ASME Journal of Engineering for Gas
Turbines and Power, 124, pp. 256-263, 2002.
Contact
Tel: +30-24210-74077, Fax: +30-24210-74096,
E-mail: tastamat@uth.gr, website : http://www.mie.uth.gr/Stamatis.html
24
Herricos Stapountzis
Associate Professor
Compressible Fluid Mechanics, Hydrodynamic Machines
Research Interests and Activities
Research interests include unsteady and turbulent flows, transition, shear flows,
mixing and dispersion, vortex shedding, wind turbine and airplane aerodynamics,
flow visualization, measuring techniques.
Representative research projects are as follows:
(1) Mechanisms of mixing in interfacial flows (2002-2004), Funding: GSRT-Bilateral
cooperation Greece – Russia. Partner: Russian Academy of Sciences
(2) Development of CTV gear box for application on wind turbines (2003 - 2006).
Funding: GSRT EPAN programme. Partners: DAVNET, Public Power Corporation,
AUTH, GMC.
Dr Stapountzis received his Diploma
in Mechanical Engineering from
NTUA in 1974 and his Ph.D. from
Imperial College (University of
London, UK, Aeronautics
Department) in 1978. Before joining
the Department in 2000 he served
as faculty member in the
Department of Mechanical
Engineering at Auth for 15 years.
Selected Publications
H. Stapountzis, D. Tsipas, A. Stamatellos, A comparative study of heat and mass
transfer by impinging jets. 8th European Turbulence Conference, Barchelona,
2000.
O.K. Rediniotis, H. Stapountzis, D.P. Telionis, Periodic vortex shedding over delta
wings. AIAA Journal, 31, pp. 1555-1562, 1993.
H. Stapountzis, J. Westerweel, J.M. Bessem, A. Westendorp, F.T.M. Nieuwstadt,
Measurement of product concentration of two parallel reactive jets using digital
image processing. Journal of Applied Scientific Research, 49, pp. 245-249, 1992.
U. Karnik, H. Stapountzis, S. Tavoularis, Vortex shedding from bluff cylinders in
strongly sheared turbulent flows. Journal of Wind Energy Ind. Aerod., 26, pp.
165-178, 1987.
H. Stapountzis, B.L. Sawford, J.C.R Hunt, R.E. Britter, Structure of the temperature
field downwind of a line source in grid turbulence. Journal of Fluid Mechanics,
165, pp. 401-424, 1986.
Contact
Tel : +30-24210-74003, Fax : +30-24210-74052
E-mail: erikos@mie.uth.gr, website : http://www.mie.uth.gr/Stapountzis.html
25
Panagiotis Tsiakaras
Associate Professor
Catalysis, Electrocatalysis & Fuel Cells
Research Interests and Activities
Professor Tsiakaras’ research is oriented toward solid state electrochemistry, fuel
cells (Proton Exchange Membrane Fuel Cells & Solid Oxide Fuel Cells) engineering,
design and development of catalysts and catalytic and electrocatalytic reactors,
chemical & electrochemical promotion of catalysis.
More precisely, Prof. Tsiakaras focuses on the following topics:
Catalysis and electrocatalysis. Catalysts, reaction kinetics & reactors for: methane
activation, (partial oxidation & catalytic combustion), gaseous pollutants
oxidation/reduction, ethanol steam reforming, and water gas shift reaction.
Electrochemical techniques for the study of catalytic reactions. Electrocatalytic
oxidations of fuels (natural gas, alcohols ect). Catalyst Promotion: Electrochemical
promotion of Catalysis (EPOC or NEMCA effect). Design, preparation and
characterization of catalysts with non-uniform distribution of the catalytic activity.
Study of strong metal-support interactions phenomena in catalysis (SMSI). Remote
control promotion in catalysis.
Dr Tsiakaras received his received
his diploma in Industrial Chemistry
from the University of Messina
(Italy). In 1987 he obtained his
specialization (MSc) in chemistry
and technology of catalysis from the
University of Messina and in 1992 he
received his PhD from the University
of Patras. Before joining the
Department in 1995, he has worked
as a researcher in Greece and
abroad.
Fuel cells engineering. Design, preparation, characterization and testing of anodes
and cathodes (for low and high temperature fuel cells – pemfc & sofc). Direct
alcohol fuel cells. Study of alcohols’ crossover phenomena trhough the PEMFC.
Modeling.
Solid State Electrochemistry. Design, preparation, characterization and testing of
novel electrolytic and electrodic materials for: a) low and intermediate solid oxide
fuel cells, b) electrolyzers. Study of the type of conductivity (ionic and/or
electronic) co-ionic and mixed conductors.
Representative research projects are the following:
[1] Ethanol combustion in a Solid Oxide Fuel Cell for electrical power generation
aided study. Funding: INTAS Program in collaboration with Russia-Ukrane-Italy.
[2] Design, analysis and manufacturing of PEM Fuel Cells for the direct conversion of
alcohols at low temperature. Funding GSRT - Joint research program in collaboration
with China.
[3] National project PENED, funded from Research and Development Ministry,
"Design, Development & Characterization of new electrocatalytic materials for low
temperature Direct Ethanol PEM Fuels Cells".
[4] National project PYTHAGORAS, funded from Education Ministry, "Direct ethanol
PEM Fuel Cell and transport phenomena simulation".
Selected Publications
P. Tsiakaras, PtM/C (M = Sn, Ru, Pd, W) based anode direct ethanol–PEMFCs:
Structural characteristics and cell performance. Journal of Power Sources, in
press 2007.
S. Kontou, V. Stergiopoulos, S. Song and P. Tsiakaras, Ethanol/water mixture
permeation through a Nafion® based membrane electrode assembly. Journal of
Power Sources, in press 2007.
S. Song, V. Maragou and P. Tsiakaras, Recent Advances in Direct Alcohol PEMFCs.
Fuel Cell Technology & Applications, ASME Transactions, 4 , pp. 203-210, 2007.
S. Song and P. Tsiakaras, Recent progress in direct ethanol proton exchange
membrane fuel cells (DE- PEMFCs). Applied Catalysis B., 63, pp. 187-193, 2006.
G. Andreadis and P. Tsiakaras, Ethanol Crossover and Direct Ethanol PEM Fuel Cell
Performance Modelling and Experimental Validation. Chemical Engineering
Science, 61, pp. 7497-7508, 2006.
Contact
Tel: +30-24210-74065, Fax: +30-24210-74050
E-mail: tsiak@mie.uth.gr , website : http://www.mie.uth.gr/Tsiakaras.html
26
Dimitris Valougeorgis
Associate Professor
Analytical and Computational Mesoscale Methods in Transport Phenomena
Research Interests and Activities
Basic research interests include non-equilibrium flow and transport phenomena,
kinetic theory, rarefied gas dynamics, numerical solution of integro-differential
equations (Boltzmann and kinetic model equations), lattice Boltzmann methods,
kinetic numerical approaches in CFD and magnetohydrodynamics. Based on the
above applied research is performed in the fields of nano- and micro-electromechanical systems and devices, in vacuum technology including vacuum systems of
fusion reactors and in high altitude aerodynamics.
Recent research projects focus on the following areas:
(1) Greek National Program for Controlled Thermonuclear Fusion (Association
Euratom – Hellenic Republic) funded by EURATOM (EU) and the Greek Secretariat of
Research and Technology (2000 - …).
Dr Valougeorgis received his
diploma from AUTh in 1980 and his
M.Sc and Ph.D. from the Virginia
Polytechnic Institute and State
University (VPI&SU, USA), in 1982
and 1985 respectively. During the
next two years (1985-87), he was a
visiting assistant professor at the
Dept. of Mathematics and the
Center for Transport Theory and
Mathematical Physics of VPI&SU.
He joined the faculty of the
University of Thessaly (UTh) in
1998. Before joining UTh, he worked
in Hellenic Petroleum in the
Industrial Complex of Thessaloniki
for almost 10 years.
Kinetic solvers based on model equations for simulating the vacuum systems of
fusion reactors in the whole range of the Knudsen number are implemented. Also,
lattice BGK kinetic algorithms for simulation of MHD flows and plasma turbulence
are developed.
(2) Flows and transport phenomena of binary gas mixtures in nano and micro
electromechanical devices, funded by the Ministry of Education (program
PYTHAGORAS, 2005-2006).
Flows and transport phenomena of binary gas mixtures in NEMS and MEMS in the
whole range of the Knudsen number are studied. Non-equilibrium gas flows are
solved through channels of various cross sections due to pressure, temperature and
concentration gradients. Several transport phenomena, which appear as we depart
from the continuum limit, such as thermal creep and barodiffusion, are investigated.
The work is extended to boundary driven flows such as flows in micro-cavities and
periodically grooved channels. The velocity slip coefficients of several gas mixtures
are estimated via kinetic theory.
(3) The Lattice Boltzmann Method in Computational Fluid Dynamics, funded by the
Ministry of Education (program HRAKLEITOS, 2004-2006)
A new LBM scheme based on the Shakhov (instead of the BGK) kinetic model to
resolve certain constraints of the classical LBM including its extension to nonisothermal flows is developed. Benchmarking of the new approach by solving certain
prototype problems including the Orsang-Tang vortex problem is performed. Finally,
MHD flows are simulated based on LB schemes.
Selected Publications
Varoutis, S., Sazhin, O., Valougeorgis, D., Sharipov, F., Rarefied gas flow through
short tubes into vacuum. J. Vacuum Sci. & Tech. – A, 26, 228-238, 2008.
Naris, S., Valougeorgis, D., Rarefied gas flow in a triangular duct based on a
boundary fitted lattice. Europ. J. Mech. B/Fluids, 27, 810-822, 2008.
Naris, S., Valougeorgis, Boundary driven non-equilibrium gas flow in a grooved
channel via kinetic theory. Phys. Fluids, 19, 067103.1-067103.15, 2007.
Breyiannis, G., Valougeorgis, D., Lattice kinetic simulations in 3D MHD turbulence.
Computer & Fluids, 32, 920-925, 2006.
Siewert, C. E., Valougeorgis, D., Concise and accurate solutions to half-space binarygas flow problems defined by the McCormack model and specular-diffuse wall
conditions, Europ. J. Mech. B/Fluids, 23, 709-726, 2004.
Contact
Tel: +30-24210-74058, Fax: +30-24210-74059
E-mail: diva@mie.uth.gr, website: http://www.mie.uth.gr/Valougeorgis.html
27
Nicholas S. Vlachos
Professor
Fluid Mechanics, Pumps & Turbomachines
Research Interests and Activities
Research interests include: Thermo-fluids of energy and propulsion systems.
Environmental flows and pollution dispersion. Magnetohydrodynamics. Jet flows and
turbulence. Wind turbine aerodynamics and Aeroelasticity, Computational fluid
dynamics and laser diagnostics for chemically reacting multiphase flows. Blood flow.
Representative research projects are the following:
(1) Greek National Program for Controlled Thermo-nuclear Fusion (1999-date)
Funding: EURATOM/Greek Secretariat of Res. & Tech. Partners: Nat.Tech. U. Athens,
Demokritos, U. Athens, Thessaloniki, Ioannina, Thrace & Cyprus, Tech. U. Crete.
Development of computational fluid dynamics and heat transfer models for the
study of magnetohydrodynamic flow and stability. Emphasis is given to the modeling
of natural convection MHD flows and flow in toroidal geometries of JET and ITER
type machines. Faculty: N. Vlachos (coord.), D. Valougeorgis, N. Pelekasis.
(2) Development of CFD code for aeroelasticity of wind turbine blades (2000-date)
Past Funding: Centre for Renewable Energy Sources. Partners: CRES, NTUA.
Dr Vlachos received his degrees in
M-E Eng. from NTU Athens (1967),
ΜSc in Thermal Power (1972) and
PhD in Fluids Engng. (1977) from
Imperial College, Univ. London. He
worked in England, France and USA
(1970-91) specializing in LDA and
CFD. He developed flow models for
NASA’s space shuttle & USDoE’s
flue gas desulphurization programs.
He is the first elected faculty (1992)
of the Engng. School. He was acting
chairman (‘92-98) of the Department
chairman of UTH Lib Com. (‘94-99),
member of Exec.Comm. of the Univ.
of Aegean (‘93-95) and UTH (‘9498), president of ΕΒΕΤΑΜ (‘94-98)
and founder of Thessaly Tech Park.
Dr Vlachos is director of the Fluid
Mechanics & Turbomachines Lab
and scientific responsible for the
UTH Fusion Program (Association
Euratom - Hellenic Republic).
Development of a reliable CFD model coupled with an elasticity model to study the
aeroelastic behaviour of wind turbine blades under conditions of stall.
(3) Modeling of calciner for cement production (1999-date)
Past Funding: Greek Secretariat of R&T (96SYN121). Partners: AGET Hercules.
The main objective of the project is to develop CFD models for the study of coal
combustion and calcination for cement production.
(4) Blood flow modeling and measurements (2004-date)
Funding: Lab of Fluid Mechanics & Turbomachines. Partners: NTUA, “Erricos Dunant”
Hospital.
The main objective of the project is to develop CFD models and Laser diagnostics for
the study of physiological fluids such as blood.
Selected Publications
Fidaros, D.K., C.A. Baxevanou, C. Dritselis and N.S. Vlachos, Numerical modelling of
flow and transport processes in a calciner for cement production. Powder
Technology, 171, pp. 81-95, 2007.
Politis, A.K., G.P. Stavropoulos, M.N. Christolis, F.G. Panagopoulos, N.S. Vlachos and
N.C. Markatos, Numerical modeling of simulated blood flow in idealized
composite arterial coronary grafts: Steady state simulations. J. Biomechanics,
40(5), pp. 1125-1136, 2007.
Sarris, I.E., G.K. Zikos, A.P. Grecos and N.S. Vlachos, On the limits of validity of the
low-magnetic Reynolds number approximation in MHD natural convection heat
transfer. J. Numerical Heat Transfer B, 50(2), pp. 157-180, 2006.
Sarris, I.E., S.C. Kakarantzas, A.P. Grecos and N.S. Vlachos, MHD natural convection
in a laterally and volumetrically heated square cavity. Int. J. Heat Mass Transfer,
48, pp. 3443-3453, 2005.
Baxevanou, C. and N.S. Vlachos, A comparative study of numerical schemes and
turbulence models for wind turbine aerodynamics modelling. Wind Engineering,
28(3), pp. 275-290, 2004.
Contact
Tel: +30-24210-74094, Fax: +30-24210-74085
E-mail: vlachos@mie.uth.gr, website : http://www.mie.uth.gr/labs/fluids
28
Athanasios Ziliaskopoulos
Professor
Optimization of Production/Transportation Systems
Research Interests and Activities
Research interests include Network Equilibrium and Optimization Models (Dynamic
and Stochastic, Optimum Path Algorithms (Online, Time Dependent and Stochastic),
Information Technology, Control Systems (Reactive and Anticipatory), Logistics,
Real-Time Traffic Management, and Freight Routing and Logistics.
Representative current research projects are :
[1] Partnership To Promote Efficient Freight Flow Movements In The Chicago Area Partnership for Innovation (2001-2004) (with John Birge and Jay Franke). Funding:
National Science Foundation.
[2] A Zero Public Infrastructure Vehicle Based Traffic Information System (Oct. 2001Sept. 2002) Continuation 3 years (Oct. 2002-Sep. 2005). Funding: National Science
Foundation.
[3] Evaluation of Regional Deployment of Transit Signal Preemption (2001-2003).
Funding: Regional Transportation Authority.
Dr Ziliaskopoulos received his
Diploma in Chemical Engineering
from AUTh in 1984 and his MS in
1991 and PhD in 1994 from the
Department of Civil Engineering of
University of Texas at Austin. Prior
to joining the M&ID in 2003, he was
Associate Professor of Civil
Engineering at the Northwestern
University, USA,
[4] Development of Simulation/Assignment Priority Corridor Management Approaches
(2001-2003). Funding: New Jersey DOT.
[5] Online Optimization and Control of Real-Time Systems (1998 –2003). Funding:
National Science Foundation, CAREER Award.
[6] Marketing, Policy and Pricing Services for the Panama Canal (1998-2001) (with
Leon Moses, Economics Dep. and Arthur Andersen LLP), Funding: by the Panama
Canal Commission.
Selected Publications
Waller, S.T., and Ziliaskopoulos A.K., A combinatorial user optimal Dynamic Traffic
Assignment algorithm. Annals of Operation Research, 144, pp. 249-261, 2006.
Waller, S.T., Mouskos, K.C., Kamaryiannis, D., and Ziliaskopoulos A.K., A linear
model for the continuous network design problem. Computer-aided Civil and
Infrastructure Engineering, 21, pp 334-345, 2006.
Peeta, S. and A. Ziliaskopoulos, Fundamentals of Dynamic Traffic Assignment: the
Past, the Present and the Future. Networks and Spatial Economics, 1-2, pp 201230, 2002.
Li, I.Y., A.K. Ziliaskopoulos, and D. Boyce, A combined model for time-dependent
Trip distribution and traffic assignment. Journal of the Transportation Research
Board, 1783, pp. 98-110, 2002.
Chang, E., A.K. Ziliaskopoulos and D. Boyce, A Solution Algorithm for the Combined
Interregional Commodity Flow and transportation Network Model with Link
Capacity Constraints. Transportation Research Record - Journal of the
Transportation Research Board, 1771, pp 114-124, 2001.
Contact
Tel: +30 24210 74015, Fax: +30-24210-74050
E-mail: ziliasko@mie.uth.gr, website: http://www.mie.uth.gr/Ziliaskopoulos.html
29
Contact information
Graduate Program Secretariat
Department of Mechanical Engineering, University of Thessaly
Athens Avenue, Pedion Areos, 383 34 Volos, Greece
Tel.: +30-24210-74085 or 74054, Fax: +30-24210-74050
email: pmsmmb@mie.uth.gr
website: http://www.uth.gr
MINISTRY OF NATIONAL
EDUCATION &
RELIGIOUS AFFAIRS
3
MANAGING AUTHORITY OF
OPERATIONAL PROGRAM OF
EDUCATION AND INITIAL
VOCATIONAL TRAINING
EUROPEAN COMMUNITY
Co-financing
EUROPEAN SOCIAL FUND