Cerfacs Enter the world of high performance ...

HPC simulation of aerodynamics & aeroacoustic

The next generation of commercial aircraft will require an efficient design loop on which unsteady aerodynamics is heavily involved: these include aerodynamics and aeroacoustics on fixed and mobile surfaces such as landing gear, high-lift system, FAN, compressor, turbine, wind turbine and open-rotor. CERFACS proposed to reach this objective by means of high-fidelity CFD methods (based on Large Eddy Simulation -LES- approach), which represents a breakthrough compared to industrial standards, which are based on the steady or unsteady Reynolds-Averaged Navier Stokes (RANS) turbulence modelling. To make the use of LES in industry attractive, a lot of effort have to be done to reduce the CPU cost. Efforts must be made in different directions: numerical discretization (to get the best accuracy for a given CPU time), mesh generation, turbulence modelling, co-processing and HPC efficiency on different platforms (CPU and GPU).

Among all possible CFD approaches, CERFACS is involved in two promissing ones: Lattice Boltzmann Method (LBM) and high-order discontinuous approach such as Spectral Difference Method (SDM). CERFACS believe that these approaches have a great potential to dramatically reduce the simulation cost compared to traditional CFD formalisms. In this respect, comparisons are made with the standard CFD solvers available at CERFACS.

Here is an example of an aeroacoustic simulation around a full aircraft using an LBM approach. The use of Cartesian grid with immersed boundary method makes the use of LBM the most promising approach in term of restitution time for LES simulations.


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