ECOLE DOCTORALE SI-MMEA (http://simmea.ed.univ-poitiers.fr/)
2015 Doctoral research projects for PhD recruitment
I- General information :
Etablissement
Institution
TITRE en français
French title
Poitiers (FR) :
P’D1*
X P’D2*
P’D3*
Limoges (FR) :
SPCTS*
GEMH*
La Rochelle (FR) :
LaSIE*
X UP*
ENSMA*
UL*
ENSCI*
ULR*
ANALYSE ET MODELISATION DU LIEN ENTRE CONDITIONS AMONT
ET ONDES D’INSTABILITE EN JETS TURBULENTS
TITRE en anglais
English title
ANALYSIS AND MODELLING OF THE LINK BETWEEN UPSTREAM
CONDITIONS AND INSTABILITY WAVES IN TURBULENT JETS
VILLE, LABORATOIRE
Town, Laboratory
Directeur(s) de thèse (HDR)
Supervisor(s)
Taux d’encadrement prévu (%)
Supervising rates (%)
Co-encadrant(s)
Co-supervisor(s)
Taux d’encadrement prévu (%)
Supervising rates (%)
Nom 1 :
E. Foucault
Nom 2 :
Nom 1 :
non
% :10
Prénom 1 :
%:
Prénom 2 :
P. Jordan
HDR ?
Prénom 1 :
oui
% : 90
Nom 2 :
Prénom 2 :
HDR ?
oui
non
%:
Contact pour informations
Contact for information
Compétences requises
Pre requisite
Jordan
Prénom : Peter
549366009
Email :
peter.jordan@univ-poitiers.fr
Nom :
Tel : +33
Bases solides en mécanique des fluides
*Sigle : P’D1, P’D2 et P’D3 : Départements D1, D2 et D3 de l’institut P’ : http://www.pprime.fr/;
SPCTS : http://www.unilim.fr/spcts/; GEMH : http://www.avrul.fr/spip.php?rubrique39; LaSIE :
http://www.univ-larochelle.fr/LaSIE,
UP
http://www.univ-poitiers.fr/,
ENSMA
http://www.ensma.fr/, UL : http://www.unilim.fr/, ENSCI : http://www.ensci.fr/, ULR :
http://www.univ-larochelle.fr/.
II- Description of the 3 year doctoral research project
(please make a complete description of the doctoral research project. Do not forget to mention
when the contrat will start and to give an estimation of the net salary per month)
Hydrodynamic wavepackets have been demonstrated (in two previous PhDs – Cavalieri ; Zhang) to
exist in high Reylonds-numer turbulent jets and to play a key role in the generation of aerodynamic
sound. These wavepackets can be modelled with good accuracy using linear stability theory : local,
spatial, growth rates can be predicted using a locally parallel assumption ; the axial structure of the
wavepackets can be computed using the parabolised stability equations ; the sound field can be obtained
by solving the linearised Euler or Navier-Stokes equations.
The success of linear theory in modelling the wavepacket dynamics downstream of the nozzle exit plane
motivates us to consider the conditions upatream of the exit plane. It is these that determine the initial
amplitudes of the linear waves. The work proposed will be focused on addressing this question. A
numerical database (computed using Large Eddy Simulation) is available which will allow us to make
initial inquiries using signal processing (correlating azimuthal Fourier within the nozzle with those
educed in the downstream region). Based on this analysis experiments (2-point, time-resolved PIV) will
be designed such that the causal link between upstream and downstream can be demonstrated. The final
goal will be to construct a model (within the framework of linear stability theory) for the upstreamdownstream coupling mechanism.
The project would begin in September 2015 ; it would be for a duration of 36 months. The net monthly
salary would be of the order of 1500 Euro.