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The 21 November 2016 at 14h00

PhD Defense: Thibaut BRIDEL-BERTOMEU – Investigation of Unsteady Phenomena in Rotor/Stator Cavities Using Large Eddy Simulation



This thesis provides a numerical and theoretical investigation of transitional and turbulentenclosed rotating flows, with a focus on the formation of macroscopic coherent flow structures. The underlying processes are strongly three-dimensional due to the presence of boundary layers on the discs and on the walls of the outer (resp. inner) cylindrical shroud (resp. shaft). The complexity of these flows poses a great challenge in fundamental research however the present work is also of importance for industrial rotating machinery, from hard-drives to space engines turbopumps – the design issues of the latter being behind the motivation for this thesis.
The present work consists of two major investigations. First, industrial cavities are modeled by smooth rotor/stator cavities and therein the dominant flow dynamics is investigated. For the experimental campaigns on industrial machinery revealed dangerousunsteady phenomena within the cavities, the emphasis is put on the reproduction and monitoring of unsteady pressure fluctuations within the smooth cavities. Then, the LES of three configurations of real industrial turbines are conducted to study in situ the pressure fluctuations and apply the diagnostics already validated on academic problems.


DdR. Eric SERRE, M292CNRS, Rapporteur
Pr. M.P. JUNIPER, Cambridge University, Rapporteur
Pr. G. CASALIS, ISAE, Examinateur
Dr. K. OBERLEITHNER, TUB,Examinateur
DdR. Patrice LE GAL, IRPHE-CNRS, Examinateur
Dr. Fabien JUILLET, Safran Aircraft Engines, Encadrant Entreprise
Dr. Jérôme DEHOUVE, CNES DLA, Encadrant Entreprise
Dr. Laurent GICQUEL, Cerfacs, Directeur de thèse
Dr. Gabriel STAFFELBACH,Cerfacs, Co-Directeur de thèse


Thierry Poinsot officially entered the French Academy of Sciences

CERFACS |  8 November 2021

Thierry Poinsot officially entered the French Academy of Sciences on October 12. See presentation here :Read more

The AVBP code from CERFACS at the heart of for PRACE projects from the 23rd call

CERFACS |  30 September 2021

Cerfacs is involved in three PRACE projects of the 23rd call for which hour allocation runs from 01/10/2021 to 30/09/2022. Researchers from ECL/LMFA UMR5509 (Ecole Centrale de Lyon) and IMFT (UMR 5502) laboratories have earned projects entirely based on the use of the LES solver developed by Cerfacs AVBP and involve the support of experts from the CFD and COOP teams underling the importance and effectiveness of collaborations between French labs and Cerfacs. Alexis Giauque from ECL/LMFA UMR5509 (Ecole Centrale de Lyon) has obtained not only one but two PRACE projects! The first project LESFAN (RA0101, 30 000 000 CPU hours on Irene/Rome TGCC) is based on the use of AVBP in the turbomachinery version to study the generation of noise by a fan of a real airplane engine. The second, PRACE-EDGES (RA0101, 40 000 000 CPU hours on Irene/Rome TGCC) focuses on LES modeling of dens gas in complex geometries. To do so, the LMFA Team has developed advanced thermodynamic closures in AVBP allowing the direct simulation of such flows. Laurent Selle from IMFT (UMR 5502) has received CPU hours for the GASTON project (RA0061, 30 000 000 CPU hours on Marenostrum BSC) which aims to study the structure of hydrogen flames in porous materials. For this, IMFT and Cerfacs will perform coupled simulations considering the reactive flow with AVBP as well as the conduction in the porous medium with AVTP which is known to play an central role in the flame stabilization process. Carlos Perez Arroyo from IMFT (UMR 5502) received 16 Mh CPU hours on Joliot-Curie Skylake partition to support his project WONDER.Read more