Abstract
The recently introduced circulant block-factorization preconditioners are studied in this paper. The general approach is first formulated for the case of block-tridiagonal sparse matrices. Then an estimate of the condition number of the preconditioned matrix for a model anisotropic Dirichlet boundary value problem is derived in the formκ<√2ε(n+1)+2, whereN=n 2 is the size of the discrete problem, andε stands for the ratio of the anisotropy. Various numerical tests demonstrating the behavior of the circulant block-factorization preconditioners for anisotropic problems are presented.
Zusammenfassung
In dieser Arbeit werden die kürzlich eingeführten zirkulanten Präkonditionierer untersucht, die aus Block-Faktorisierungen herrühren. Der allgemeine Zugang ist für schwach besetzte Block-Tridiagonalmatrizen formuliert. Es wird die Kondition der präkonditionierten Systemmatrix für ein Modellproblem, eine anisotrope Dirichlet-Randwertaufgabe, durch die Größeκ<√2ε(n+1)+2 abgeschätzt. Dabei stelltN=n 2 die Größe des diskretisierten Problems undε das Anisotropieverhältnis dar. Verschiedene numerische Experimente werden vorgestellt, die das Verhalten der Präkonditionierung beim Modellproblem aufzeigen.
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Lirkov, I.D., Margenov, S.D. & Zikatanov, L.T. Circulant block-factorization preconditioning of anisotropic elliptic problems. Computing 58, 245–258 (1997). https://doi.org/10.1007/BF02684392
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DOI: https://doi.org/10.1007/BF02684392