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Erschienen in:
2005 | OriginalPaper | Buchkapitel
Hybrid Schwarz-Multigrid Methods for the Spectral Element Method: Extensions to Navier-Stokes
verfasst von : Paul F. Fischer, James W. Lottes
Erschienen in: Domain Decomposition Methods in Science and Engineering
Verlag: Springer Berlin Heidelberg
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The performance of multigrid methods for the standard Poisson problem and for the consistent Poisson problem arising in spectral element discretizations of the Navier-Stokes equations is investigated. It is demonstrated that overlapping additive Schwarz methods are effective smoothers, provided that the solution in the overlap region is weighted by the inverse counting matrix. It is also shown that spectral element based smoothers are superior to those based upon finite element discretizations. Results for several large 3D Navier-Stokes applications are presented.