Séminaire ACSIOM :

Le 29 mars 2016 à 10:00 - salle 9.11 (1er étage)

Présentée par Spillane Nicole - CMAP - Polytechnique

Domain Decomposition Methods with Multiple Search Directions.

Domain Decomposition methods are a family of solvers tailored to very large linear systems that require parallel computers. They proceed by splitting the computational domain into subdomains and then approximating the inverse of the original problem with local inverses coming from the subdomains. I will present some classical domain decomposition methods and show that for realistic simulations (with heterogeneous materials for instance) convergence usually becomes very slow. Then I will explain how this can be fixed by injecting more information into the solver. In particular I will show how using multiple search directions within the conjugate gradient algorithm makes the algorithm more reliable. Efficiency is also taken into account since our solvers are adaptive.