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Sparse Days Meeting 2010

Sparse Days Meeting 2010 at CERFACS
June 15th-17th,  2010


The Sparse Days this year will be combined with the final meeting of the ANR Solstice Programme. The main themes for this project were: direct methods, hybrid methods, partitioning and ordering, and web access to codes and matrices (GRID-TLSE). Thus we will make these the very non-restrictive theme for our 2010 Sparse Days meeting. The meeting will start on the morning of Tuesday June 15th and finish around midday on Thursday June 17th; the exact schedule will depend on the papers accepted for presentation.


Adobe_PDF_file_icon_24x24  List of Participants

Adobe_PDF_file_icon_24x24  Programme

Adobe_PDF_file_icon_24x24  SLIDES :  Click on the title of a slide to view that slide

Mario Arioli  : Generalized Golub-Kahan bidiagonalization and stopping criteria
Michele Benzi  : Robust preconditioning for finite element discretizations of the steady incompressible Navier-Stokes equations
Rob Bisseling : Sparse matrix partitioning, ordering, and visualisation by Mondriaan 3.0
Olivier Boiteau : EDF participation to the ANR Project SOLSTICE
Matthias Bollhoefer :  Multilevel block preconditioning for shifted Maxwell equations
Alfredo Buttari and Bora Ucar  : Parallel preprocessing in MUMPS
Mikko Byckling :  Approximate Factoring of the Inverse
Jean-Yves L’Excellent : The MUMPS library: work done during the Solstice project
Luc Giraud : MaPHYS or the development of a parallel algebraic domain decomposition solver in the course of the Solstice project
David Goudin  : High performance Methods to solve Large 3D Electromagnetic Problems
Pascal Henon : Preconditioning the Schur complement in a hybrid direct/iterative solver
Sherry Li : A Supernodal Approach to Incomplete LU Factorization with Partial Pivoting
Gerard Meurant : On the residual norm in FOM and GMRES
Esmond Ng : Sparse matrix computation in large-scale scientific applications
Francois Pellegrini : PT-Scotch in Solstice and beyond: where to go now
Jean-Pierre Pinty : Transport, chemistry and improved parallelization of the pressure solver in the regional atmospheric model MesoNH
Chiara Puglisi : GRID-TLSE Project
Yousef Saad : Computing the diagonal of the inverse of a matrix
Jennifer Scott : The multicore challenge: the sparse indefinite case
Hillel Tal-Ezer  : Risolv – Robust Iterative Solver
Andres Tomas : Efficient Gram-Schmidt orthogonalization with CUDA for iterative eigensolvers
Serge Van Criekingen  : A Parallel Neutron Transport Solver based on Domain Decomposition
Mohamed Zenadi  : 3D CFD Simulation Using a Parallel Hybrid Approach of the Block Cimmino Iterative Method


First 360-degrees Large-Eddy Simulation of a full engine

Jérôme DOMBARD |  17 June 2020

Within the PRACE project FULLEST (First fUlL engine computation with Large Eddy SimulaTion), a joint collaboration between CERFACS, SAFRAN and AKIRA technologies, Dr. C. Pérez Arroyo (post doctoral fellow at CERFACS) has carried out under the supervision of Dr. J. Dombard the first high-fidelity simulation of a part of the real engine DGEN380 (for now, from the fan to the combustion chamber). This 360-degrees integrated large-eddy simulation contains around two billion cells on the three instances, carried out with the AVBP code of CERFACS.  The CPU cost is obviously large but still within reach, performing around one turn of fan during 5 days over 14400 skylake cores. Post-treatments are in progress and already show, among other complex phenomena, a strong interaction between the high pressure compressor and the combustion chamber (see forthcoming paper GT2020-16288 C. Pérez Arroyo et al). Below a video showing: in the fan an isosurface at mid-height of the vein colored by the Mach number, in the high pressure compressor a gradient of density, in the bypass of the combustion chamber the static pressure and in the flame tube a temperature field. One of the goals of the project is to create a high-fidelity unsteady database to study interactions between modules and may help other teams to develop new lower order models and/or validate existing ones. Beyond the feasibility and the maturity of the AVBP code, this kind of calculation is an important milestone for the aeronautical industry and would allow to apprehend earlier in the design the effect of integration and installation and thus, to reduce the cycle and therefore the cost of the future aircraft engines. PRACE and GENCI CPU ressources and Safran Tech/DGAC fundings are gratefully acknowledged, along with the invaluable technical support at CERFACS: Dr. G. Staffelbach, Dr. F. Duchaine, Dr. L. Gicquel, Dr....Read more

B. Cuenot distinguished as Program Chair of international Symposium on Combustion

superadmin |  29 May 2020

B. Cuenot has been distinguished as Program Chair for the 39th International Symposium on Combustion, to be held in Vancouver (Canada) in 2022. The International Symposium on Combustion is a major event for the combustion community, where the current best research is presented.Read more