Aitken-Schwarz method for CFD solvers

M. Garbey

Research output: Chapter in Book/Report/Conference proceedingChapter

1 Scopus citations

Abstract

This chapter describes the Aitken-Schwarz method for CFD (Computational Fluid Dynamic) solvers. The Schwarz algorithm has two important qualities that make its use in CFD applications very attractive. Firstly this method is very easy to implement on an existing CFD code and does not require a complete re-writing of the code. Secondly, the iteration step in a parallel implementation of the Schwarz algorithm is (memory) scalable thanks to the fact that communications are always among neighbor's sub-domains. Slow numerical convergence of the Schwarz algorithm is the main reason for which the Schwarz implementation is generally just a first step in parallelizing existing code. It is a classical approach to speed up the Schwarz method by combining the multilevel method with domain decomposition. However this technique generally implies a deep change in the data structure, in particular with unstructured grids that have large aspect ratio for meshes. This chapter is restricted to the two overlapping subdomain case and focuses on what might be done to make the method effective with general discretization, in particular for unstructured meshes or non matching grids.

Original languageEnglish (US)
Title of host publicationParallel Computational Fluid Dynamics 2003
Subtitle of host publicationAdvanced Numerical Methods, Software and Applications
PublisherElsevier
Pages267-275
Number of pages9
ISBN (Electronic)9780080473673
ISBN (Print)9780444516121
DOIs
StatePublished - May 6 2004

ASJC Scopus subject areas

  • Mathematics(all)

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