Cerfacs Enter the world of high performance ...

The 31 March 2021 at 14h00

PhD defense of Soizic ESNAULT – “Large Eddy Simulations of Heat Transfer within Aircraft Engine Acoustic Treatments”


Fig: “Vortex structures generated by synthetic jets on a representative configuration of an aircraft engine acoustic liner”


The OPTIMA project, funded by DGAC for Airbus, focuses on two major issues for propulsion systems : thermal protection and thermal optimization. The thesis aims at setting high fidelity numerical modelling for acoustic treatment devices in order to better understand the heat transfer mechanisms they trigger which could potentially be used to enable the optimisation of heat exchanges in engine nacelles. The study uses Large Eddy Simulations (LES) and completes an experimental study performed by Institut Pprime, Poitiers (France).

These modelling will aim at :

1.     Validating the numerical methodology, based on the experimental results ;

2.     Validating choices made during the design of the test rig ;

3.     Extending the operating point domain studied with the test rig ;

In order to :

4.     Increase the knowledge about the flow dynamics within nacelle acoustic treatments, complementarily to the experimental results ;

5.     Understand and control the role played by acoustic treatments in wall heat transfer ;

6.     Identify the parameters that impact the studied device performance.

The LES tool used during the project is AVBP (developed by CERFACS). It is a solver for the compressible Navier-Stokes equations. Its high scalability on massively parallel machines allows to have access to high order predictions on unstructured meshes in reasonable restitution time. It is widely used in the combustion community, and is more and more used for intern aerodynamics, thanks to the recent adding of new functions for turbomachinery simulations.

Keywords: heat transfer, large eddy simulations, acoustic treatments, aeronautical acoustic liners


Franck NICOUDUniversité de Montpellier (France)Referee
Matthieu FENOTISAE ENSMA Poitiers (France)Referee
Eric LAMBALLAISUniversité de Poitiers (France)Member
Estelle PIOTOnera Toulouse (France)Member
Stéphane MOREAUUniversité de Sherbrooke (Canada)Member
Arnulfo CARAZO MENDEZAirbus Toulouse (France)Invited member
Laurent GICQUELCERFACS Toulouse (France)Invited member
Florent DUCHAINECERFACS Toulouse (France)Advisor


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