Cerfacs Enter the world of high performance ...

Cerfacs in brief

Centre of basic and applied research specialized in modelling and numerical simulation, Cerfacs, through its facilities and expertise in high-performance computing, deals with major scientific and technical research problems of public and industrial interest.

To learn more

NEWS

CMIP6 debriefing workshop – May 2021: a stocktaking and foresight exercise that highlighted the major and long-term investment of the CNRM-CERFACS group in the latest climate model intercomparison international exercise

CERFACS |  9 June 2021

The participation of the CNRM-CERFACS group in the international coupled global climate model intercomparison exercise CMIP6 was debriefed on 10 and 11 May. Since the mid-1990s, the various phases of the Coupled Model Intercomparison Project (CMIP), supported by the World Climate Research Programme (WCRP), have enabled climate science to make significant progress, feeding into the IPCC reports, supporting regional climate modelling activities and downstream climate services. On the balance sheet, the participation of CNRM-CERFACS in the extremely demanding CMIP6 exercise has resulted in a large-scale, high-quality contribution in terms of climate simulations, thanks in particular to the strong commitment of researchers and engineers, the quality of support services and national and international collaborations. The activities mainly took place over the period 2013-2020. Initially, the production environment ("workflow") was set up and the coupled climate models were assembled by capitalising on the development of components (atmosphere, ocean and continental surfaces) carried out over the long term. The actual production of simulations was spread over 2018-2020. During the debriefing, perspectives (scientific objectives, model development, organisation) were drawn up with a view to a new participation of CNRM and CERFACS in CMIPRead more


CERFACS Combustion paper on rocket engines selected as Distinguished Paper at the last Int. Symp. on Comb. in Adelaide

CERFACS |  14 April 2021

The paper of C. Laurent 'Heat-release dynamics in a doubly- transcritical LO2/LCH4 cryogenic coaxial jet flame subjected to fuel inflow acoustic modulation’  has been selected at the Distinguished Paper in the Gas Turbine and Rocket Engine Combustion colloquium for the 38th International Symposium on Combustion. This paper authored by Laurent, Staffelbach, Nicoud  and  T. Poinsot  is available here:  describes the first LES of a forced doubly transcritical flame.Read more

All News

CALENDAR

No event has been found

ALL EVENTS

RESEARCH PUBLICATIONS

Malé, Q., Vermorel, O., Ravet, F. and Poinsot, T. (2021) Jet Ignition Prediction in a Zero-Dimensional Pre-Chamber Engine Model, International Journal of Engine Research, doi:10.1177/14680874211015002

[url] [doi]

@ARTICLE{AR-CFD-21-61, author = {Malé, Q. and Vermorel, O. and Ravet, F. and Poinsot, T. }, title = {Jet Ignition Prediction in a Zero-Dimensional Pre-Chamber Engine Model}, year = {2021}, doi = {10.1177/14680874211015002}, journal = {International Journal of Engine Research}, abstract = {This paper presents a multi-chamber, multi-zone engine model to predict the ignition of a lean main chamber by a pre-chamber. The two chambers are connected by small cylindrical holes: the flame is ignited in the pre-chamber, hot gases propagate through the holes and ignite the main chamber through Turbulent Jet Ignition (TJI). The model original features are: i) separate balance equations for the pre- and main chambers, ii) a specific model for temperature and composition evolution in the holes and iii) a DNS-based model 1 to predict the ignition of the main chamber fresh gases by the burnt gases turbulent jets exiting the holes. Chemical reactions during TJI are the result of two competing mixing processes: (1) the hot jet gases mix with the fresh main chamber to produce heated zones and (2) at the same time, these hot gases cool down. (1) increases combustion and leads to ignition while (2) decreases it and can prevent ignition. The overall outcome (ignition or failure) is too complex to be modelled simply and the present model relies on recent DNSs of TJI1 which provided a method to predict the occurrence of ignition. Incorporating this DNS information into the engine model allows to predicts whether ignition will occur or not, an information which is not accessible otherwise using simple models. The resulting approach is tested on multiple cases to predict ignition limits for very lean cases, e↵ects of H2 injection into the pre-chamber and optimum size for the holes connecting the two chambers as a function of equivalence ratio.}, keywords = {turbulent jet ignition, pre-chamber ignition, internal combustion engine, multi-zone engine model}, url = {https://doi.org/10.1177/14680874211015002}}

Schauberger, B., Makowski, D., Ben-Ari, T., Boé, J. and Ciais, P. (2021) No historical evidence for increased vulnerability of French crop production to climatic hazards, Agricultural and Forest Meteorology, 306, pp. 108453, doi:10.1016/j.agrformet.2021.108453

[pdf] [doi]

@ARTICLE{AR-CMGC-21-63, author = {Schauberger, B. and Makowski, D. and Ben-Ari, T. and Boé, J. and Ciais, P. }, title = {No historical evidence for increased vulnerability of French crop production to climatic hazards}, year = {2021}, volume = {306}, pages = {108453}, doi = {10.1016/j.agrformet.2021.108453}, journal = {Agricultural and Forest Meteorology}, pdf = {https://cerfacs.fr/wp-content/uploads/2021/05/GlobC_Article-Scauberger-No-historical-evidence-for-increased-vulnerability-of-French.pdf}}

Jang, Y. and Shaw, S. (2021) A priori error analysis for a finite element approximation of dynamic viscoelasticity problems involving a fractional order integro-differential constitutive law, Advances in Computational Mathematics, 47 (46), doi:10.1007/s10444-021-09857-8

[pdf] [doi]

@ARTICLE{AR-PA-21-65, author = {Jang, Y. and Shaw, S. }, title = {A priori error analysis for a finite element approximation of dynamic viscoelasticity problems involving a fractional order integro-differential constitutive law}, year = {2021}, number = {46}, volume = {47}, doi = {10.1007/s10444-021-09857-8}, journal = {Advances in Computational Mathematics}, pdf = {https://link.springer.com/article/10.1007/s10444-021-09857-8}}

Renard, F., Feng, Y., Boussuge, J. -F. and Sagaut, P. (2021) Improved compressible hybrid lattice Boltzmann method on standard lattice for subsonic and supersonic flows, 219 (April 2021), pp. 104867, ISSN 0045-7930, doi:10.1016/j.compfluid.2021.104867

[doi]

@ARTICLE{AR-CFD-21-53, author = {Renard, F. and Feng, Y. and Boussuge, J.-F. and Sagaut, P. }, title = {Improved compressible hybrid lattice Boltzmann method on standard lattice for subsonic and supersonic flows}, year = {2021}, number = {April 2021}, volume = {219}, pages = {104867 }, issn = {0045-7930}, doi = {10.1016/j.compfluid.2021.104867}, abstract = {A D2Q9 Hybrid Lattice Boltzmann Method (HLBM) is proposed for the simulation of both compressible subsonic and supersonic flows. This HLBM is an extension of the model of Feng et al. [1], which has been found, via different test cases, to be unstable for supersonic regimes. To circumvent this limitation, we propose:: (1) a new discretization of the lattice closure correction term that makes possible the simulation of supersonic flows, (2) a corrected viscous stress tensor that takes into account polyatomic gases, and (3) a novel discretization of the viscous heat production term fitting with the regularized formalism. The result is a hybrid method that resolves the mass and momentum equations with an LBM algorithm, and resolves the entropy-based energy equation with a finite volume method. This approach fully recovers the physics of the Navier–Stokes–Fourier equations with the ideal gas equation of state, and is valid from subsonic to supersonic regimes. It is then successfully assessed with both smooth flows and flows involving shocks. The proposed model is shown to be an efficient, accurate, and robust alternative to classic Navier–Stokes methods for the simulation of compressible flows}, keywords = {LBM, Compressible High speed flow, Shock waves, Aerodynamic noise}}

Mohanamuraly, P. and Müller, J. D. (2021) An Adjoint‐assisted Multilevel Multifidelity Method for Uncertainty Quantification And Its Application To Turbomachinery Manufacturing Variability, International Journal for Numerical Methods in Engineering, 122 (9), pp. 2179-2204, doi:10.1002/nme.6617

[pdf] [doi]

@ARTICLE{AR-PA-21-45, author = {Mohanamuraly, P. and Müller, J.D. }, title = {An Adjoint‐assisted Multilevel Multifidelity Method for Uncertainty Quantification And Its Application To Turbomachinery Manufacturing Variability}, year = {2021}, number = {9}, volume = {122}, pages = {2179-2204}, doi = {10.1002/nme.6617}, journal = {International Journal for Numerical Methods in Engineering}, keywords = {Multilevel Multifidelity Monte Carlo, Uncertainty Quantification, Goalbased PCA, Adjoint Sensitivity, Manufacturing Variations}, pdf = {https://doi.org/10.1002/nme.6617}}

All publication

JOBS OFFERS

Quantifiying particle deposition on solar panels (soiling) with large eddy simulation

 

Context The European Center for Research and Advanced Training in Scientific Computation (CERFACS) aims to solve,...Read more


Simulation of hydrogen safety scenarios in future aircraft configurations (AIRBUS/CERFACS)

 

The introduction of hydrogen in the aircraft of the future raises various issues linked to safety...Read more

ALL OFFERS