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Sparse Days Meeting 2006 at CERFACS

Sparse Days Meeting 2006 at CERFACS

 

June 15th-16th 2006

A two-day meeting on sparse matrix matters at CERFACS, Toulouse, France, June 15th-16th, 2006.

After the excitement of hosting CSC’05 last year, we return to our normal pattern of holding our regular meeting “Sparse Days at CERFACS”. This meeting will start mid-morning on Thursday June 15th and finish mid-afternoon on the 16th. The main theme this year will be on “optimization”.

 


PICTURES



Programme of Thursday, June15th


Session on constrained optimization

10.15 – 10.45 : M. Saunders : *The LUSOL algorithm*

11.15 – 11.45 : N. Gould : Finding a well-centred point for a set of polyhedral constraints

11.45 – 12.15 : J. Hall : Parallel matrix inversion for the revised simplex method – A study

12.15 – 12.45 : C. Cartis : A new perspective on the complexity of interior point methods for linear programming

 

Session on unconstrained optimization

14.30 – 15.00 : J.D. Muller : Simultaneous time-stepping methods for optimal design

15.00 – 15.30 : A. Sartenaer : Trust-region algorithms for multilevel optimization

15.30 – 16.00 : C. Sainvitu : Use of approximate derivatives in the filter-trust-region method for unconstrained optimization

 

Session on data assimilation

16.00 – 16.30 : N.K. Nichols : Using model reduction in Gauss-Newton optimization with applications to data assimilation

17.00 – 17.30 : J. Tshimanga : On some preconditioning techniques for linear least-squares problems with multiple right-hand sides

17.30 – 18.00 : G. Desroziers : Large least-squares problems in Meteorology

 

Poster session

M. Rojas : A Comparison of Methods for the Large-Scale Trust-Region Subproblem


Programme of Friday, June 16th


Session on iterative methods for linear systems

09.15 – 09.45 : M. Arioli : A note on GMRES preconditioned by a perturbed $ LDL^T$ decomposition with static pivoting

09.45 – 10.15 : S. Dollar : Implicit factorization constraint preconditioners and permutations

10.15 – 10.45 : S. MacLachlan : Greedy strategies for multilevel partitioning

 

Session on sparse techniques

11.15 – 11.45 : G. Gundersen : Sparsity in Higher Order Methods in Optimization

11.45 – 12.15 : A. Pothen : The Optimal Computation of Hessians in Optimization

12.15 – 12.45 : Ph. L. Toint : Exploiting sparsity in optimization algorithms

 

Session on derivative free optimization

14.30 – 15.00 : M. Garcia : *Neuronal networks for derivative free optimization*

15.00 – 15.30 : M. Sosonkina : Performance Studies of a Parallel Global Search on System X

 

Session on sparse solver

15.30 – 16.00 : T. Slavova : *Efficient triangular solution in sparse out-of-core solvers*


Adobe_PDF_file_icon_24x24 List of participants

NEWS

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

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