Cerfacs Enter the world of high performance ...

From 18 October 2021 to 20 October 2021

Fundamentals to understand and analyse high fidelity compressible LES

nasri |  

Deadline for registration: 15 days before the starting date of each training
Duration : 3 days / (21 hours)

Before signing up, you may wish to report us any particular constraints  (schedules, health, unavailability…) 

at the following e-mail address : training@cerfacs.fr

Satisfaction index

In November 2019, 50% of participants were satisfied or very satisfied

(results collected from 6 respondents out of 12 participants, a response rate of 50%)


This training course enables the participants to reinforce their theoretical knowledge in order to understand and analyze high fidelity compressible Large Eddy Simulation (LES). Numerical methods, boundary conditions, signal processing and unsteady turbulence modeling are the main subjects tackled. Hands-on sessions are organized to put the theoretical courses into practice.

Objective of the training

The objective of this training course is to become familiar with the LES in order to realize and analyze LES of turbulent flows.

Learning outcomes

On completion of this course, you will be able to:

  • Explain the concept of turbulent scale separation
  • Derived LES equations,
  • Choose a subgrid scale model
  • Define a-priori parameters for a LES (mesh, CPU cost…)
  • Become familiar with compressible boundary conditions
  • Analyze a turbulent flow

Teaching methods

The training is an alternation of theoretical presentations and practical work. A multiple choice question allows the final evaluation. The training room is equiped with computers, the work can be done in sub-groups of two people.

Target participants

This training session is for students, engineers, physicists and computer scientists who wish to reinforce or extend their theoretical background to the precise use and analysis of CFD simulations.

Prerequisites and registration

In order to follow this course, you need to:

  • Know Unix commands
  • Have basic knowledge of Python.
  • Know numerical flow simulations.
  • Have level B2 of CEFR (training can take place in French or English depending on the audience).

To verify that the prerequisites are satisfied, the following questionnaires must be completed. You need to get at least 75% of correct answers in order to be authorized to follow this training session. If you don’t succeed it, your subscription will not be validated. You only have two chances to complete them.

Questionnaire 1 : Unix commands

Questionnaire 2 : Python edition

Questionnaire 3 : Numerical flow simulations


After completing the pre-requisite tests and obtaining at least 75% correct answers, you can register:



Referent teacher: Guillaume Daviller



  • Trainees/PhDs/PostDocs : 210 € excl. tax
  • CERFACS shareholders/CNRS/INRIA : 600 €excl. tax
  • Public : 1200 € excl. tax


(Every day from 9h to 17h30)

Jour 1

  • Turbulence and scale separation
    Large Eddy Simulation

Jour 2

  • Subgrid scale models ; discretisation and meshing techniques
    Hybrid simulations RANS/LES ; wall modeling and turbulence injection

Jour 3

  • Acoustics – compressible boundary conditions
    Signal treatment : frequential analysis, spatio-temporal correlations

Evaluation of learning

A final exam will be conducted during the training.


The AVBP code from CERFACS at the heart of three 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.Read more

watch the online contest ”my thesis in 180 sec” organized for Marie Curie actions

CERFACS |  24 September 2021

Next Thursday, Sept 30th the #FallingWallsLab #MSCA research presentation competition will take place, . This is a competition in which 15 researchers compete to deliver the best presentation of their research topic in the format "my thesis in 180 seconds" . Javier Crespo-Anadon, 3rd year PhD student in the CFD team is one of the 15 finalists and he will present this thesis topic: ignition in spinning combustion engines for a reduction in CO2 emissions! You can watch it online on the above website on Sept 30th at 3pm. I encourage you to go to the website and register!  You'll be able to listen to the other participants' pitches and vote for your favorite. Come and see for yourself what kind of research the EU funds!Read more