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Computational Fluid Dynamics Softwares

The CFD team at CERFACS develops a wide range of software tools for fluid flows, with or without chemical reaction. The major codes are listed below:

Explosions in building

Explosions in building: LES with the high-fidelity solver AVBP on an INCITE machine: 1 billion cells. A premixed flame propagates from the left to the right side of the picture and increases speed when it meets obstacles and generates turbulence. See many more examples and movies here. in the field of combustion and turbo machinery



AVBP is a LES (Large Eddy Simulation) code dedicated to unsteady compressible flows in complex geometries with combustion or without combustion. It is applied to combustion chambers, turbo machinery, safety analysis, optimization of combustors, pollutant formation (CO, NO, soot), UQ analysis. AVBP uses a high-order Taylor Galerkin scheme on hybrid meshes for multi species perfect of real gases. Its spatial accuracy on unstructured hybrid meshes is 3 (4 on regular meshes). The AVBP formulation is fully compressible and allows to investigate compressible combustion problems such as thermoacoustic instabilities (where acoustics are important) or detonation engines (where combustion and shock must be computed simultaneously).

AVBP is a world standard for LES of combustion in engines and gas turbines, owned by CERFACS and IFP Energies Nouvelles. It is used by multiple laboratories (IMFT in Toulouse, EM2C in Centralesupelec, TU Munich, Von Karmann Institute, ETH Zurich, etc) and companies (SAFRAN AIRCRAFT ENGINES, SAFRAN HELICOPTER ENGINES, ARIANEGROUP, HERAKLES, etc). It is also used as a usual benchmark code by many computing centers to test their machines. The code is managed using specialized tools: git for source management, Redmine to track users experience, bi annual release of new versions. 100 to 200 users work with AVBP in Europe and hundreds of different configurations are computed every year.

AVBP is also used today to compute turbomachinery (compressors and turbines) and to compute full engine configurations. Being able to compute simultaneously the compressor and the chamber of the chamber and the turbine or all three is now possible with AVBP. This is critical for multiple problems such as new propulsion concepts (such as Rotating Detonation Engines) or to study coupled phenomena such as the noise emitted from a gas turbine.

AVBP has always been at the forefront of HPC research at CERFACS: its efficiency has been verified up to 250 000 cores with grids of 2 to 4 billion cells. This was done through multiple PRACE (EUROPE) and INCITE (USA) CPU time allocations. This requires a continuous work on the code architecture itself. CERFACS collaborates with INTEL through an IPCC  to continuously increase the performances of the solver. Collaborations with IBM and NVIDIA are also frequent. Starting in 2019, CERFACS will be a member of the Excellerat Center of Excellence where AVBP developments will be intensified.

AVBP was the baseline code for the European Research Council advanced grant on thermoacoustics lead by IMFT and CERFACS: INTECOCIS (http://intecocis.inp-toulouse.fr) which finished in 2018. It is now the main code used by CERFACS, SAFRAN TECH and SAFRAN HELICOPTER in two ITN Marie Curie projects focusing on instabilities and ignition in annular chambers: ANNULIGHT coordinated by NTNU and MAGISTER coordinated by Un. Twente.


JAGUAR is a new high-order method developed at CERFACS and based on spectral difference techniques. It can offer very high orders of accuracy (4 to 8) on arbitrary meshes. Jaguar is developed jointly by CERFACS and ONERA to build a high-order tool for combustion and more generally for energetic applications.


elsA is a software owned by ONERA and co developed for certain aspects by CERFACS. For example, for aircraft aerodynamics or for turbo machinery, CERFACS develops certain aspects of elsA and applies this tool to various design problems.



NextSim General Assembly and TC meeting

CERFACS |  16 September 2021

The General Assembly and TC Meeting took place on 15-16 September 2021. CERFACS is involved in the NextSim project (). The primary objective is to increase the capabilities of Computational Fluid Dynamics tools on extreme-scale parallel computing platforms for aeronautical design. 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. This project has received funding from the Agence Nationale de la Recherche (ANR) under grant agreement N° ANR-20-EHPC-0002-02. For more information, please visit Read more

Sophie Valcke from Cerfacs co-authored a new book on atmosphere-ocean modelling

CERFACS |  18 August 2021

new book "Atmosphere-Ocean Modelling - Couling and Couplers” by Prof. Carlos R Mechoso, Prof. Soon-Il An and Dr Sophie Valcke has just been published by World Scientific. The present book fills a void in the current literature by presenting a basic and yet rigorous treatment of how the models of the atmosphere and the ocean are put together into a coupled system. Details are available at  Abstract: Coupled atmosphere-ocean models are at the core of numerical climate models. There is an extraordinarily broad class of coupled atmosphere-ocean models ranging from sets of equations that can be solved analytically to highly detailed representations of Nature requiring the most advanced computers for execution. The models are applied to subjects including the conceptual understanding of Earth’s climate, predictions that support human activities in a variable climate, and projections aimed to prepare society for climate change. The present book fills a void in the current literature by presenting a basic and yet rigorous treatment of how the models of the atmosphere and the ocean are put together into a coupled system. The text of the book is divided into chapters organized according to complexity of the components that are coupled. Two full chapters are dedicated to current efforts on the development of generalist couplers and coupling methodologies all over the worldRead more