Date:

Thursday, April 9, 2009,
11:30 am - 12:30 pm.

Place:

Mathematics Conference Room 626, UCD Building, 1250 14th St., Denver.

Speaker:

Luc Giraud
http://giraud.perso.enseeiht.fr/

Affiliation:

INPT-Toulouse, in partial secondment at INRIA

Title:

Algebraic preconditioners for parallel hybrid solvers in 3D.

Abstract:

In this work we investigate the parallel scalability of variants of additive Schwarz preconditioners for three dimensional non-overlapping domain decomposition methods. To alleviate the computational cost, both in terms of memory and floating-point complexity, we investigate variants based on a sparse approximation. The robustness of the preconditioners is illustrated on a set of linear systems arising from the finite element discretization of academic diffusion and convection-diffusion problems, and from real-life structural mechanical problems.

Parallel experiments exploiting one and two level of paralelism on up to a thousand processors on some problems will be presented. The efficiency from a numerical and parallel performance view point are studied on problem ranging from a few hundred thousands unknowns up-to a few tens of millions.

This is a joint work with A. Haidar (INPT-IRIT, Univ. Toulouse)