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Multiplicative Schwarz Methods for Discontinuous Galerkin Approximations of Elliptic Problems

  • Paola F. Antonietti (a1) and Blanca Ayuso (a2)

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.

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Keywords

Multiplicative Schwarz Methods for Discontinuous Galerkin Approximations of Elliptic Problems

  • Paola F. Antonietti (a1) and Blanca Ayuso (a2)

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