A FETI-DP TYPE DOMAIN DECOMPOSITION ALGORITHM FOR THREE-DIMENSIONAL INCOMPRESSIBLE STOKES EQUATIONS
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Issue Date
2015-03-03Author
Tu, Xuemin
Li, Jing
Publisher
Society for Industrial and Applied Mathematics
Type
Article
Article Version
Scholarly/refereed, publisher version
Rights
Copyright © by SIAM. Unauthorized reproduction of this article is prohibited.
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Show full item recordAbstract
The FETI-DP (dual-primal finite element tearing and interconnecting) algorithms,
proposed by the authors in [SIAM J. Numer. Anal., 51 (2013), pp. 1235–1253] and [Internat. J.
Numer. Methods Engrg., 94 (2013), pp. 128–149] for solving incompressible Stokes equations, are
extended to three-dimensional problems. A new analysis of the condition number bound for using
the Dirichlet preconditioner is given. The algorithm and analysis are valid for mixed finite
elements with both continuous and discontinuous pressures. An advantage of this new analysis is
that the numerous coarse level velocity components, required in the previous analysis to enforce the
divergence-free subdomain boundary velocity conditions, are no longer needed. This greatly reduces
the size of the coarse level problem in the algorithm, especially for three-dimensional problems. The
coarse level velocity space can be chosen as simple as those coarse spaces for solving scalar elliptic
problems corresponding to each velocity component. Both the Dirichlet and lumped preconditioners
are analyzed using the same framework in this new analysis. Their condition number bounds are
proved to be independent of the number of subdomains for fixed subdomain problem size. Numerical
experiments in both two and three dimensions, using mixed finite elements with both continuous
and discontinuous pressures, demonstrate the convergence rate of the algorithms.
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Citation
Tu, X., & Li, J. (2015). A FETI-DP Type Domain Decomposition Algorithm for Three-Dimensional Incompressible Stokes Equations. SIAM Journal on Numerical Analysis, 53(2), 720-742. doi:10.1137/13094997x
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