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Multiplicative Schwarz Methods for Discontinuous Galerkin Approximations of Elliptic Problems

Published online by Cambridge University Press:  03 April 2008

Paola F. Antonietti  and
Blanca Ayuso
Paola F. Antonietti
Affiliation:
Dipartimento di Matematica, Università di Pavia, Via Ferrata 1, 27100 Pavia, Italy. paola.antonietti@unipv.it
Blanca Ayuso
Affiliation:
Istituto di Matematica Applicata e Tecnologie Informatiche - CNR, Via Ferrata 1, 27100 Pavia, Italy. blanca@imati.cnr.it
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Abstract

In this paper we introduce and analyze some non-overlapping multiplicative Schwarz methods for discontinuous Galerkin (DG) approximations of elliptic problems. The construction of the Schwarz preconditioners is presented in a unified framework for a wide class of DG methods. For symmetric DG approximations we provide optimal convergence bounds for the corresponding error propagation operator, and we show that the resulting methods can be accelerated by using suitable Krylov space solvers. A discussion on the issue of preconditioning non-symmetric DG approximations of elliptic problems is also included. Extensive numerical experiments to confirm the theoretical results and to assess the robustness and the efficiency of the proposed preconditioners are provided.

Keywords

Domain decomposition methodsSchwarz preconditionersdiscontinuous Galerkin methods.
Type
Research Article
Information
ESAIM: Mathematical Modelling and Numerical Analysis , Volume 42 , Issue 3 , May 2008 , pp. 443 - 469
Copyright
© EDP Sciences, SMAI, 2008

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