Local Fourier Analysis of Balancing Domain Decomposition By Constraints Algorithms
Abstract
Local Fourier analysis is a commonly used tool for the analysis of multigrid and other multilevel algorithms, providing both insight into observed convergence rates and predictive analysis of the performance of many algorithms. In this paper, for the first time, we adapt local Fourier analysis to examine variants of two- and three-level balancing domain decomposition by constraints (BDDC) algorithms, to better understand the eigenvalue distributions and condition number bounds on these preconditioned operators. This adaptation is based on a modified choice of basis for the space of Fourier harmonics that greatly simplifies the application of local Fourier analysis in this setting. The local Fourier analysis is validated by considering the two-dimensional Laplacian and predicting the condition numbers of the preconditioned operators with different sizes of subdomains. Several variants are analyzed, showing that the two- and three-level performance of the “lumped” variant can be greatly improved when used in multiplicative combination with a weighted diagonal scaling preconditioner, with weight optimized through the use of local Fourier analysis.
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Information & Authors
Information
Published In
SIAM Journal on Scientific Computing
Pages: S346 - S369
DOI: 10.1137/18M1191373
ISSN (online): 1095-7197
Copyright
© 2019, Society for Industrial and Applied Mathematics.
History
Submitted: 31 May 2018
Accepted: 18 June 2019
Published online: 29 October 2019
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Funding Information
Office of Science https://doi.org/10.13039/100006132 : DE-SC0016140
Natural Sciences and Engineering Research Council of Canada https://doi.org/10.13039/501100000038
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