A New Parallel Domain Decomposition ... - Semantic Scholar
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A New Parallel Domain Decomposition ... - Semantic Scholar
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A New Parallel Domain Decomposition Preconditioner I: Application with an Adaptive Parallel Finite Element Solver Randolph E. Bankand Peter K. Jimacky Abstract: Adaptive algorithms are of great importance in computational mechanics codes since they can allow both reliability, through the satisfaction of error tolerances, and eciency, by ensuring that the total number of degrees of freedom present is as small as possible. Unfortunately, the successful incorporation of adaptivity into most software is a complex programming task, and this is especially true for parallel codes. This paper introduces a new parallel domain decomposition preconditioner which is ideally suited for use in an adaptive framework. Unlike conventional domain decomposition approaches, this technique requires each process to work on the entire domain but with a coarse mesh which has been locally re ned only in the subdomain for which that process is responsible. In order to justify the proposed preconditioner it is presented as a natural development of existing domain decomposition and subspace iteration algorithms, and its implementation as part of a parallel mesh adaptivity algorithm, due to Bank and Holst [2], is also outlined. The paper concludes with the presentation and discussion of a number of provisional numerical results.
1 Introduction Throughout this paper we will consider the parallel nite element solution of the following linear second order model problem.
Problem 1.1 Find u 2 HE1 ( ) such that A(u; v) = F (v); 8v 2 H01( ) ;
