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.



Tribute to Françoise Chatelin

Brigitte Yzel |  23 July 2021

  Tribute to Françoise CHATELIN   Virtual & Face to Face event @ Cerfacs 14 October 2021, CERFACS, Toulouse (France) 2 pm - 6.30 pm   Cerfacs is organizing a half scientific day on Thursday October 14, 2021 in tribute to Françoise Chatelin who left us prematurely on May 14, 2020   After graduating from the Ecole Normale Supérieure in Paris (1960-63), and her PhD in Mathematics at Grenoble University (1971) , Françoise Chatelin led with worldwide recognition her research in many areas, from spectral theory for linear operators in Banach spaces and finite precision to Dickson algebras. Professor Chatelin taught at the Universities Grenoble 2 - Pierre Mendès-France and Paris 9 - Dauphine before moving to Toulouse in 1996. She became Emeritus Professor in 2015. She was a visiting researcher at Berkeley and Stanford Universities, IBM San Jose (Ca) and Yorktown Heights (NY). For almost a decade, she was a scientific manager in Industry (in charge of intensive computing) first at the Centre Scientifique IBM France in Paris (1985 -1992) and then in the Central Research Lab of Thales (known as Thomson-CSF at that time) near Paris (1992-95). Françoise Chatelin was Head of the Qualitative Computing group at the Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique (Cerfacs) in Toulouse, France. Professor Chatelin has authored four books; the first three are now classic references available from SIAM. Her second book Valeurs Propres de Matrices (Masson, Paris, 1988) has received the IBM - France prize for « Best Scientific and technical publication 1988 ». Beyond her scientific contribution, Françoise Chatelin played a structuring role on research at CERFACS through multiple thesis on innovative topics. This event is devoted to the human and scientific tribute of her life. As a faithful image of the active and passionate woman that...Read more

CERFACS is involved in the NextSim project

CERFACS |  19 July 2021

The primary objective is to increase the capabilities of Computational Fluid Dynamics tools on extreme-scale parallel computing platforms for aeronautical design. The Kick-Off Meeting took place on 12 March 2021. This project has received funding from the European High-Performance Computing Joint Undertaking (JU) under grant agreement N° 956104. The JU receives support from the European Union’s Horizon 2020 research and innovation programme and Spain, France, Germany. For more information, please visit  EuroHPC website : Project webpage :Read more