On the merits of using a 3D-FGAT assimilation scheme with an outer loop for atmospheric situations governed by transport.
S. Massart, B. Pajot, A. Piacentini and O. Pannekoucke Monthly weather review, december 2010, vol 138, No 12: 4509-4522.
Semilocal and global convergence of the Newton-HSS method for systems of nonlinear equations. X.P. Guo and I.S. Duff
Numerical Linear Algebra and Applications,28 June 2010.
A dialogue about qualitative computing. C. Calude and F. Chatelin.
Bulletin of EATCS, 101, 29-41, 2010.
Numerical information processing under the global rule expressed by the Euler-Riemann zeta function in the complex plane. F. Chatelin.
Chaos, 20-3, 037104-1, 2010.
Approximate Invariant Subspaces and Quasi-Newton Optimization Methods and Software. S. Gratton and Ph. L. Toint
Optimization Methods and Software, 25-4, 507-529, 2010.
Harmonic balance-based code-coupling strategy for the calculation of aeroelastic system response to forced excitation. F. Blanc, F.X. Roux, and J.C. Jouhaud.
AIAA Journal, 48(11):2472-2481, 2010.
Large eddy simulation of a stable supersonic jet impinging on a flat plate. A. Dauptain, B. Cuenot, and L.Y.M. Gicquel.
AIAA Journal, 48(10):2325-2338, 2010
Contrasting the harmonic balance and linearized methods for oscillating-flap simulations. G. Dufour, F. Sicot, G. Puigt, C. Liauzun, and A. Dugeai.
AIAA Journal, 48(4): 788-807, 2010.
Curnvilinear finite volume schemes using high order compact interpolation. A. Fosso Pouangué, H. Deniau, F. Sicot and P. Sagaut.
Journal of Comptutational Physics, 229(13):5090-5122, 2010.
A two-step chemical scheme for large eddy simulation of kerosene-air flames. B. Franzelli, E. Riber, M. Sanjosé, and T. Poinsot.
Combustion and Flame, 157(7):1364-1373, 2010
Comparison of nonreflectiong outlet boundary conditions for compressible solvers on unstructured grids. V. Granet, O. Vermorel, T. Leonard, L.Y.M. Gicquel and T. Poinsot.
AIAA Journal, 48(10):2348-2364, 2010.
On the stability and dissipation of wall boundary conditions for compressible flows. N. Lamarque, M. Porta, F. Nicoud, and T. Poinsot.
International Journal for Numerical Methods in Fluids, 62:1134-1154, 2010.
Comparison of gradient-based and gradien-enhanced response-surface-based optimizers. J. Laurenceau, M. Meaux, M. Montagnac and P. Sagaut.
AIAA Journal, 48(5):981-994, 2010.
A model for the injection boundary conditions in the context of 3d simulation of diesel spray: Methodology and validation. L. Martinez, A. Benkenida, and B. Cuenot.
Fuel, 89(1°:219-228, 2010.
Analysis of unsteady reacting flows and impact of chemistry description in large eddy simulations of side-dumps ramjet combustors. A. Roux, L.Y.M. Gicquel, S. Reichstadt, N. Bertier, G. Staffelbach, F. Vuillot and T. Poinsot.
Combustion and Flame, 157(1): 176-191, 2010.
The PRISM support Initiative, COSMOS and OASIS4, In: A. Baklanov, A.Mahura and R. Sokhi (Eds), Integrated Systems of Meso-Meteorological and Chemical Transport Models. R. Redier, S. Valcke and H. Haak.
Springer Verlag, Berlin, pp 105-115
The PRISM support Initiative, COSMOS and OASIS4, In: A. Baklanov, A.Mahura and R. Sokhi (Eds), Integrated Systems of Meso-Meteorological and Chemical Transport Models. R. Redier, S. Valcke and H. Haak.
Springer Verlag, Berlin, pp 105-115
Coupled atmosphere: mixed layer ocean response to ocean heat flux convergence along the Kuroshio Current Extension Y.O. Kwon, C. Deser, C. Cassou
Climate Dynamics, doi:10.1007/s00382-10-0764-8
A statistical-dynamical scheme for reconstructing ocean forcing in the Atlantic. C. Cassou, M. Minvielle, L. Terray and C. Périgaud
Part I : weather regimes as predictors for ocean surface variables.
Climate Dynamics dio:10.1007/s00382-010-0781-7
A statistical-dynamical scheme for reconstructing ocean forcing in the Atlantic. C. Cassou, C. Bourdalle-Badie, L. Terray and L. Najac
Part II : methodology, validation and application to high-resolution ocean models.
Climate Dynamics dio:10.1007/s00382-010-0761-y
Natural forcing of climate during the last millenium: fingerprint of solar variability Low frequency solar forcing and NAO. D. Swingedouw, L. Terray, C. Cassou, A. Voldoire, D. Salas-Média and J. Servonnat.
Climate Dynamics, doi:10.1007/s00382-010-0803-5
Winter 2010 in Europe: A cold extreme in a warming climate. J. Cattiaux, R. Vautard, C. Cassou, P. Yiou, V. Masson-Delmotte and F. Codron
Geophys. Res. Lett., 37
Link between large scale atmospheric circulation and heat waves for seasonal forecasting and climate change impact studies. J. Boe, C. Cassou, L. Terray, S. Parey, L. Dubus
Houille blanche. Revue internationale de l'eau, 4, 67-71
Consistency and fidelity of Indonesian-throughflow total volume ransport estimated by 14 ocean data assimilation products. T. Lee, T. Awaji, M.A. Balmaseda, N. Ferry, Y. Fuji, I. Fukumori, B. Giese, P. Heimbach, A. Kohl, S. Masina, E. Remy, A. Rosati, M. Schodlok, D. Stammer and A.T. Weaver
Dyn. Atmos. Ocean, 50, pp 201-223
Representation of correlation functions in variational assimilation using an implicit diffusion operator. I. Mirouze and A. Weaver.
Quartely Journal of the Royal Meteorological Society,136, 1421-1443, 2010.
Fast regularized linear sampling for inverse scattering problems. M. Fares, S. Gratton and Ph. L. Toint.
Numerical Linear Algebra with applications, DOI: 10.1002/nla.698, 2010.
Augmented Galerkin Scheme for the Solution of Scattering by small obstacles. F. Collino and X. Claeys.
Numerische Mathematik, vol 116, n°2, p246-268, 2010.
A well-conditionned integral equation for iterative solution of scattering problems with a variable Leontovitch boundary condition. S. Pernet.
Mathematical Modelling and Numerical Analysis, vol 44, n°4, p781-801, 2010.
A low-Mach number model for time-harmonic acoustics in arbitrary flows. A.S. Bonnet-Ben Dhia, JF Mercier, F. Millot and S. Pernet
ournal of Computational and Applied Mathematics, vol 234, n°6, p1868-1875, 2010.
SVD-tail: a new linear-sampling reconstruction method for inverse scattering problems. M. Fares, S. Gratton and Ph. L. Toint
Inverse problems, vol 25, n°9, p1-19, 2009.
On the Block Triangular Form of Symmetric Matrices. I.S. Duff and B. Uçar.
SIAM Review, 52-3, p. 455-470, 2010.
CERFACS and the Georgia Institute of Technology are planning a workshop on the theme of "Coupling Technologies for Earth System Modelling : Today and Tomorrow". The first thrust of the workshop is to assess the state of the art in ESM coupling frameworks. The second thrust is to discuss a vision for coupling in the year 2020. The discussions should lead to a white paper outlining the requierements of the next generation coupling frameworks.
The scientific evaluation of the Associated Laboratory with CNRS (SUC, for "Sciences de l'Univers au CERFACS") took place at CERFACS on December 1st and 2nd, 2009. This evaluation was conducted by AERES (Agence d'Evaluation de la Recherche et de l'Enseignement Supérieur). The highest possible rating, A+, was obtained (see
Sparse Days 2010
On June 15-17th the Sparse Days conference took place at CIC, Meteo-France in Toulouse with more than sixty people from ten different countries attending. This conference is organized each year by CERFACS with the aim of presenting recent research in numerical linear algebra, optimization and high-performance computing.
This year the conference hosted the final workshop of the SOLSTICE project funded by the French Agence Nationale de la Recherche. Twenty-five talks were given during the conference. They covered both theoretical and applied aspects. Talks given on the solution of frontier problems from industrial partners highlighted the new progress in terms of parallel algorithms obtained during the SOLSTICE project. The other talks covered similar work in an international context and included invited talks by leading researchers in the field.
B. MOHAMMADI will be the next CERFACS' director
CERFACS' shareholders have selected the forthcoming director: M. Bijan MOHAMMADI, professor ("classe exceptionnelle") of numerical simulation at the University of Montpellier and director of I3M (Montpellier Institute for Mathematics and Modelling).
He will start full-time at CERFACS on October 1st 2010.
An award for CERFACS paper on combustion noise in gas turbines
The paper "Numerical and analytical investigation of the indirect noise in a nozzle" by M. Leyko, F. Nicoud, S. Moreau and T. Poinsot, Comptes Rendus Mécanique 2009, Vol 337, pp. 415-425, Doi:10.1016/j.cme.2009.06.025 (projet BRUCO) has been selected as one of the best three papers in projects subsidized by FRAE (Fondation de Recherche pour l'Aéronautique et Espace : www.fnrae.org ). This paper describes noise generation in turbine by entropy spots and confirms a theory proposed by S. Candel thirty years ago at CALTECH (now professor at Ecole Centrale Paris).
SIAM confers Fellows status on CERFACS Project leader Iain Duff.
34 noteworthy professionals were selected as SIAM (The Society for Industrial and Applied Mathematics) Fellows, from a total membership of over 13,000 individual members. They will be recognized in July during the 2010 SIAM Annual Meeting in Pittsburg, Pennsylvania. The 2010 class of Fellows is the first nominated by the SIAM community. It includes a diverse group of men and women who have made significant contributions to the fields of applied mathematics and computationnal science. By honoring them as Fellows, SIAM acknowledges them as leaders in their fields.
SIX CERFACS former students among the first 16 graduates of the C3I label (Certificat de Compétences en Calcul Intensif).
GENCI and the French Universities have created a new label to increase the visibility of students preparing a PhD involving significant work on High Performance Computing. The list of the first 16 PhD students having obtained this label is now available at
http://www.genci.fr/spip.php?article71 . Six of these students have prepared their PhD at CERFACS, confirming its unique place in the framework of HPC in France, for research as well as for training.
A new computing resource at CERFACS
CERFACS has ordered at the end of April a new high-performance computing resource. Consisting of 2 304 AMD Magny-Cours cores on 96 nodes this new HP server will have a peak performance of 20.3 Tflop/s. Its non-blocking QDR (Quadruple Data Rate) Infiniband network and its Luster infrastructure will insure a good scalability of parallel applications. This new server will be opened next October.
One of the "classic" LES papers of CERFACS still second in April 2010 'Top 10 most cited' papers of Combustion and Flame.
One of the first LES of reacting swirling flows published by CERFACS, IMFT, DLR and Turbomeca is still Number 2 but will soon disappear from the "Top 10 most cited papers" of Combustion and Flame because it will be five years old (and only recent papers are listed). This paper has been in the Top 10 consistently (and first quite often) over the last three years. It has become a "classic" in this field and will certainly continue to be cited in the future.
Paper reference: Roux S., Lartigue G., Poinsot T., Meier U. and Berat C. Studies of mean and unsteady flow in swirled combustor using experiments, acoustic analysis and Large Eddy Simulations. Comb. Flame. 141, 40-54 (2005)
CERFACS award in INCITE program (Department of Energy) renewed.
8 million CPU hours have been awarded to CERFACS in 2010 to continue studying combustion in gas turbines using Large Eddy Simulation (LES). CERFACS is one of the only non american groups working in INCITE and this award confirms the unique place of CERFACS tools for reacting flows.
About INCITE: The Innovative and Novel Computational Impact on Theory and Experiment (INCITE) program promotes cutting-edge research that can only be conducted with state-of-the-art supercomputers. The Leadership Computing Facilities (LCFs) at Argonne and Oak Ridge national laboratories, supported by the U.S. Department of Energy Office of Science, operate the program. The LCFs award sizeable allocations (typically tens of millions of processor hours per project) on powerful supercomputers to researchers from academia,government, and industry addressing grand challenges in science and engineering such as developing new energy solutions and gaining a better understanding of climate change resulting from energy use.
CERFACS LES of combustion first in Combustion and Flame Top 10 citations.
The combustion paper by Selle, Lartigue, Poinsot, Koch, Schildmacher, Krebs, Prade, Kaufmann and Veynante on LES of gas turbine chambers ("Compressible large eddy simulation of turbulent combustion in complex geometry on unstructured meshes") is the most cited Combustion and Flame papers over the last five years. Comb. Flame is the first journal in the field of energy with an Impact factor larger than two. This work was a collaborative study between IMF Toulouse, Institute of Thermal Turbomachinery, University of Karlsruhe, Siemens PG and Laboratoire EM2C, Ecole Centrale de Paris. Another CERFACS LES paper ("Studies of mean and unsteady flow in a swirled combustor using experiments, acoustic analysis, and large eddy simulations") was ranked first since 2008 and is still number 8. This confirms the impact of recent CERFACS work on this field.
On November 9th, the INRIA Chairman, Michel COSNARD, and the CERFACS Director, Jean-Claude ANDRE, signed a convention creating a joint laboratory between the two establishments. This laboratory, whose Director is Jean ROMAN and whose Scientific Advisor is Iain DUFF, is located in Bordeaux and Toulouse. In its present first phase it will address the development of new algorithmic methods for massive parallelism and hybrid architectures.
International workshop on "Multiphysics and unsteady flows for aircraft" at CERFACS in september 2010
CERFACS, jointly with ONERA, AIRBUS, SAFRAN, ERCOFTAC and the European Commission will organize the first MUSAF meeting (Multiphysics and Unsteady Simulations for Aeronautical Flows) at CERFACS in Toulouse (France), on September 27 - 29, 2010.
The conference will focus on coupled problems around aircraft (aerodynamics, aeroacoustics, fluid structure) but also within engines (noise, combustion, instabilities, coupling between compressor, chamber and turbine) and on the use of High Performance Computing (HPC) to address these issues. By bringing together the communities working on the different elements of aircraft and engine designs, the most important issues in the flield of HPC in these fields will be adressed.
The MUSAF programme will be available at the end of October 2009 on the wen site :
In order to increase its hosting capacity for an additional one hundred persons, CERFACS has just launched an extension program. A second building will be erected close to the actual one, and connected via a number of meting rooms and an 80-seat conference room. The architect was chosen on Septembre 30, 2009. The building phase will indeed start at the very beginning of 2010, and should be finished before the end of the year. The actual building will then be slightly improved and remodelled.
For the second time, Benedetta Franzelli, an italian PhD student in the CERFACS-CFD team under the ECCOMET European project (Marie Curie: www.cerfacs.fr/eccomet) has been awarded the Amelia Earhart fellowship. The Zonta International Amelia Earhart Fellowships were established in 1938 in honor of Amelia Earhart, famed pilot and Zonta club member. The Amelia Earhart Fellowships supports and encourages young female researchers to pursue a brilliant scientific career at the highest level in the field of aerospace-related sciences and engineering. The Fellowship of US$10,000 aims at promoting excellence and the strong potential of the award winners.
Anthony Roux has received the PhD prize of Institut National Polytechnique de Toulouse for his work on Large Eddy Simulation of ramjet flows. This work was supported by DGA (Délégation générale pour l'armement) and performed in collaboration with ONERA. A. Roux is now a post doctoral student at Center for Turbulence Research at Stanford, collaborating with CERFACS and SAFRAN.
Mélodie Mouffe has been awarded the Léopold Escande Prize of Institut National Polytechnique of Toulouse. Her PhD thesis on "Multilevel optimization in infinity norm and associated stopping criteria" has been jointly supervised by Serge Gratton and Philippe Toint in the framework of a cotutelle between Institut National Polytechnique of Toulouse and FUNDP University of Namur (Belgium). http://www.cerfacs.fr/algor/reports/Dissertations/TH_PA_09_49.pdf
Martin Fuchs (postdoctoral fellow in the "Parallel Algorithms" Team) has been awarded the silver IJAR Young Researcher Award during the last conference ISIPTA'09 (http://www.sipta.org/isipta09/). This award granted by the International Journal of Approximate Reasoning (IJAR) honours outstanding young researchers in imprecise probabilities.
