Emerging Technologies for FETCH2
Jeff Gomes
Applied Modelling and Computation Group
(AMCG)
Severe Accident Subproject Meeting
14/11/2011
Outline
 Multi-Physics Software Suite;
 Next-Generation Multiphase Flow Dynamic
core (synergy between projects within
AMCG);
 Emerging Multi-Physics Technologies.
AMCG: Multi-Physics Software Suite
Legacy
Fluidity
(Multiphase)
FETCH
(coupled Multiphase
and RT)
EVENT
(Radiation
Transpot)
Add an adaptivity library
•Fissile
solutions,
Finite/Discrete
Element
which performs topological
Methods;
porous
media
matrix,
operations
on the
mesh, and
Particle
modelling
(Newton
reactors;
mesh movement, to optimise
Law)
and and structural
the size
shape
•Compressible
(with of
mechanics
(material
elements
in response
phase
change)
and to
error measures
engineering
–
stress
incompressible flows;
modelling);

Working
robustly
and
•Simple
structural
One-/Two-Way
coupling
with
efficiently
in parallel
FETCH-2
mechanics
response
Fluidity;
(couples multiphase,

Also limited
building an stress
adjoint to
(i.e.,
Used
in
coastal
defence,
RT and
structural
the
model
for
data
response)
failure
criteria);
reservoir
fractures
and
assimilation,
sensitivity
particle
flows applications;
•Quad/Hex
finite
studies
and
goal-based
 But
can be
potentially
used
error
estimation
elements
with
CV
inrepresentation
nuclear
engineering
of
 Make use of open source
(geological
wasteforrepository
scalar
(no
solutions fields
solvers,
and preconditioners,
stress-induced
core
parallel adaptivity); I/O,
fractures
and degradation
in
visualisation,
etc
reactors)

Multi-Physics Models
Fluidity-ICOM
(CFD, single phase,
multi-material)
Fluidity-Multiphase
(CMFD)
VGeST
(DEM, FEMDEM)
Radiant
(RT)
AMCG: Multi-Physics Software Suite
Page 4
Research & Development:
Emerging Technologies
(Improving Modelling Functionality)
R&D (Cross-Cutting activities),
2010-2014
FETCH2
FETCH2
FP7/THINS:
Discretisation
Methods
FP7/GoFastR
& EPSRC-SA:
Safety Assessment in
reactors (severe
accident scenarios)
EPSRCMBase/B&W:
Criticality in Fissile
Solutions
AMCG
New Dynamic Core
for multiphase flow in
Fluidity
Qatar
Petroleum/Shell
New Model for
Reservoir Simulator
Emerging Technologies: Mesh Adaptivity
and Domain Decomposition
Lower frame shows the domain
decomposition which has been
optimised to balance the load based
on number of nodes and minimised
edge cut
Emerging Technologies: Mesh Adaptivity and Domain
Decomposition – lock-exchange problem (P1DGP2
balance element)
Movie
Page 8
Emerging Technologies: Multi-Material
Interface Tracking (moving and
adaptative meshes)
 Compressible high-resolution control
volume advection methods combined
with moving and adaptive meshes;
 Limiting schemes to ensure conservative
and bounded solutions;
 Arbitrary number of materials can be
tracked.
Emerging Technologies: Multi-Material
Interface Tracking (3 materials)
Emerging Technologies: Conservative interpolation –
crucial for many applications with mesh
adaptivity and coupled models
‘donor’
mesh
‘target’
mesh
‘super mesh’
and mapping
from donor
mesh
Following Page
construction
11 of the supermesh we are able to perform
projection operations to achieve conservative, bounded (etc…)
interpolation schemes. 2D: Farrell et al., 2009
3D: Farrell, Maddison, 2009
Emerging Technologies: Finite/Discrete Element
Methods (FEMDEM)
FEM
+
DEM
Emerging Technologies: Finite/Discrete Element
Methods (FEMDEM)
Land-slide and
Idealised coastal defence
Emerging Technologies: Finite/Discrete Element
Methods (FEMDEM)
Idealised coastal defence accropode blocks;
Study of stress-induced fractures for different block designs.
Emerging Technologies: Immersed-Body
Method (Fluid-Solid Interaction Modelling)

One-/Two-way coupling of Fluids and Solids (Capturing
Interactions)

In Fluidity, solid is treated as fluid (multiphase flow)

1 mesh for the domain (fluid), 1 mesh for solid: user-friendly
as it is easy to generate the meshes of complex solids

Usage of Conservative Interpolation in order to obtain solid's
location on the fluids mesh

Exchange of momentum and location between solids and fluid
at each time-step

Introducing third phase: Air (acting as a surface)
Emerging Technologies: Immersed-Body
Method (Fluid-Solid Interaction Modelling)
ImmersedBody Method
Re=5k
Re=1k
Emerging Technologies: Immersed-Body
Method (Fluid-Solid Interaction Modelling)
Emerging Technologies:
Thermo-Chemical Modelling
Initial generic chemical modelling framework for
geochemistry application (funded by QCCRSC
Programme) for oil/gas reservoirs, CO2 sequestration
and storage aquifers (PhD student);
 Chemical kinetics and thermodynamic equilibrium;
In order to improve of our understanding of a set of SA
phenomenology we need a sophisticated thermochemical model framework within (or coupled to)
FETCH2 with a reliable chemical-kinetics library
covering:
Chemical reactions and advanced thermodynamics (EOS
 phase change);
Back-up Slides
Research & Development
Model and Software Quality Assurance
 Code repository;
 Automatic and continuous verification & validation;
 More than 100 verification & validation test-cases for RT;
 More than 1000 verification & validation test-cases for CFD
(including unit-tests);
 Large number of benchmark tests for the coupled formulation
(e.g., TRACY, SILENE, CRAC, SUPO, HTR, Shipping-port reactor and
other AIEA –based tests)
 Full documentation;
 International training (e.g., B&W, LANL, Y12, open-source
community, etc)
Research & Development
Model and Software Quality Assurance