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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.

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NEWS

New challenges in climate data analytics

superadmin |  8 June 2017

Christian Pagé, CERFACS, has been invited to present at the Forum Teratec 2017 in the HPC workshop, which will be held at École Polytechnique on June 27th and 28th. The TERATEC Forum is a major event in France and Europe that brings together the best international experts in HPC, Simulation and...Read more


PhD positions available in two Marie Curie programs to begin at CERFACS in 2017 on combustion instabilities

superadmin |  18 May 2017

CERFACS has won two Marie Curie (ec.europa.eu/research/mariecurieactions) projects on instabilities in combustion systems: the first one MAGISTER will focus on machine learning methods for combustion instabilities and is coordinated by Un. Twente (Netherlands) while the second one (ANNULIGHT) will...Read more

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CALENDAR

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Thu

07

Sep

From 7 September 2017 to 8 September 2017

Sparse Days Meeting 2017 at Cerfacs

Salle JCA, Cerfacs, Toulouse |  


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RESEARCH PUBLICATIONS

Vermorel, O., Quillatre, P. and Poinsot, T. (2017) LES of explosions in venting chamber: a test case for premixed turbulent combustion models, Combustion and Flame, 183 (september), pp. 207-223

[pdf] [Supplementary Material]

@ARTICLE{AR-CFD-17-91, author = {Vermorel, O. and Quillatre, P. and Poinsot, T. }, title = {LES of explosions in venting chamber: a test case for premixed turbulent combustion models}, year = {2017}, number = {september}, volume = {183}, pages = {207-223}, journal = {Combustion and Flame}, abstract = {This paper presents a new experimental and Large Eddy Simulation (LES) database to study upscaling effects in vented gas explosions. The propagation of premixed flames in three setups of increasing size is investigated experimentally and numerically. The baseline model is the well-known laboratory-scale combustion chamber from Sydney (Kent et al. 2005, Masri et al. 2012); two exact replicas at scales 6 and 24.4 were set up by GexCon (Bergen, Norway). The volume ratio of the three setups varies from 1 to more than 10 000, a variation unseen in previous experiments, allowing the exploration of a large range of Reynolds and Damköhler numbers. LES of gaseous fully premixed flames have been performed on the three configurations, under different operating conditions, varying the number of obstacles in the chamber, their position and the type of fuel (hydrogen, propane and methane). Particular attention is paid to the influence of the turbulent combustion model on the results (overpressure, flame front speed) comparing two different algebraic sub-grid scale models, the closures of Colin et al. (2000) and Charlette et al. (2002), used in conjunction with a thickened flame approach. Mesh dependency is checked by performing a highly resolved LES on the small-scale case. For a given scale and with a fixed model constant, LES results agree with experimental results, for all geometric arrangement of the obstacles and all fuels. However, when switching from small-scale cases to medium-scale or large-scale cases this conclusion does not hold, illustrating one of the main deficiencies of these algebraic models, namely the need for an a priori fitting of the model parameters. Although this database was initially designed for safety studies, it is also a difficult test for turbulent combustion models. }, keywords = {Gas explosion; Large Eddy Simulation; Turbulent combustion model; Efficiency function}, pdf = {http://cerfacs.fr/wp-content/uploads/2017/06/CFD_vermorel_CF_2017.pdf}, supplementaryMaterial = {http://cerfacs.fr/wp-content/uploads/2017/06/CFD_mmc1.mp4}}

Bessières, L., Leroux, S., Brankart, J. -M., Molines, J. M., Moine, M. -P., Bouttier, P. -A., Penduff, T., Terray, L., Barnier, B. and Serazin, G. (2017) Development of a probabilistic ocean modelling system based on NEMO 3.5: application at eddying resolution, Geoscientific Model Development, pp. 1091-1106, doi:10.5194/gmd-10-1091-2017

[pdf] [doi]

@ARTICLE{AR-CMGC-17-76, author = {Bessières, L. and Leroux, S. and Brankart, J.-M. and Molines, J.M. and Moine, M.-P. and Bouttier, P.-A. and Penduff, T. and Terray, L. and Barnier, B. and Serazin, G. }, title = {Development of a probabilistic ocean modelling system based on NEMO 3.5: application at eddying resolution}, year = {2017}, pages = {1091-1106}, doi = {10.5194/gmd-10-1091-2017}, journal = {Geoscientific Model Development}, pdf = {http://cerfacs.fr/wp-content/uploads/2017/05/GLOBC-Article-Mai-Bessieres_et_al_GMD_2017.pdf}}

Monerie, P. A., Sanchez-Gomez, E. and Boé, J. (2017) On the range of future Sahel precipitation projections and the selection of a sub-sample of CMIP5 models for impact studies, Climate Dynamics, 48 (7), pp. 2751–2770, doi:10.1007/s00382-016-3236-y

[url] [doi]

@ARTICLE{AR-CMGC-17-28, author = {Monerie, P.A. and Sanchez-Gomez, E. and Boé, J. }, title = {On the range of future Sahel precipitation projections and the selection of a sub-sample of CMIP5 models for impact studies}, year = {2017}, number = {7}, volume = {48}, pages = {2751–2770}, doi = {10.1007/s00382-016-3236-y}, journal = {Climate Dynamics}, url = {https://link.springer.com/article/10.1007/s00382-016-3236-y}}

Daviller, G., Brebion, M., Xavier, P., Staffelbach, G., Mueller, J. -D. and Poinsot, T. (2017) A mesh adaptation strategy to predict pressure losses in LES of swirled flows, Flow Turbulence and Combustion, doi:10.1007/s10494-017-9808-z

[pdf] [url] [doi]

@ARTICLE{AR-CFD-17-66, author = {Daviller, G. and Brebion, M. and Xavier, P. and Staffelbach, G. and Mueller, J.-D. and Poinsot, T. }, title = {A mesh adaptation strategy to predict pressure losses in LES of swirled flows}, year = {2017}, doi = {10.1007/s10494-017-9808-z}, journal = {Flow Turbulence and Combustion}, abstract = {Large-Eddy Simulation (LES) has become a potent tool to investigate instabilities in swirl flows even for complex, industrial geometries. However, the accurate prediction of pressure losses on these complex flows remains difficult. The paper identifies localised near-wall resolution issues as an important factor to improve accuracy and proposes a solution with an adaptive mesh h-refinement strategy relying on the tetrahedral fully automatic MMG3D library of Dapogny et al. (J. Comput. Phys. 262, 358-378, 2014) using a novel sensor based on the dissipation of kinetic energy. Using a joint experimental and numerical LES study, the methodology is first validated on a simple diaphragm flow before to be applied on a swirler with two counter-rotating passages. The results demonstrate that the new sensor and adaptation approach can effectively produce the desired local mesh refinement to match the target losses, measured experimentally. Results shows that the accuracy of pressure losses prediction is mainly controlled by the mesh quality and density in the swirler passages. The refinement also improves the computed velocity and turbulence profiles at the swirler outlet, compared to PIV results. The significant improvement of results confirms that the sensor is able to identify the relevant physics of turbulent flows that is essential for the overall accuracy of LES. Finally, in the appendix, an additional comparison of the sensor fields on tetrahedral and hexahedral meshes demonstrates that the methodology is broadly applicable to all mesh types.}, keywords = {LES, swirl injector, pressure losses, adaptive mesh refinement}, pdf = {http://cerfacs.fr/wp-content/uploads/2017/04/davilleretal_FTaC_2017.pdf}, url = {http://link.springer.com/article/10.1007%2Fs10494-017-9808-z}}

Costantino, L., Cuesta, J., Emili, E. and et al. (2017) Potential of multispectral synergism for observing ozone pollution by combining IASI-NG and UVNS measurements from the EPS-SG satellite, Atmospheric Measurement Techniques, 10 (4), pp. 1281-1298, ISSN 1867-8548, doi:10.5194/amt-10-1281-2017

[url] [doi]

@ARTICLE{AR-AE-17-56, author = {Costantino, L. and Cuesta, J. and Emili, E. and et al.}, title = {Potential of multispectral synergism for observing ozone pollution by combining IASI-NG and UVNS measurements from the EPS-SG satellite}, year = {2017}, number = {4}, volume = {10}, pages = {1281-1298}, issn = {1867-8548}, doi = {10.5194/amt-10-1281-2017}, journal = {Atmospheric Measurement Techniques}, url = {http://dx.doi.org/10.5194/amt-10-1281-2017}}

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Mono-channel methods and modeling for LES of turbomachinery stages

 

Context / Contexte Large Eddy Simulation (LES) is clearly identified as the next generation of turbulent modeling tool [1] that will improve high...Read more


Three Marie Curie PhD positions at CERFACS on combustion instabilities in 2017/2018

 

CERFACS develops all models and tools to perform Large Eddy Simulations (LES) of reacting flows in combustion chambers. The AVBP code of CERFACS...Read more

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