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A non-overlapping domain decomposition method for continuous-pressure mixedfinite element approximations of the Stokes problem* **

Published online by Cambridge University Press:  30 November 2010

Hani Benhassine
Affiliation:
Département de Mathématiques, Université de Jijel, BP 98 Aouled Aissa, 18000 Jijel, Algeria.Université de Toulouse, Institut Mathématique de Toulouse, Département de Génie Mathématique, INSA de Toulouse, 135 avenue de Rangueil, 31077 Toulouse Cedex 4, France. h.benhassine@gmail.com; abendali@insa-toulouse.fr
Abderrahmane Bendali
Affiliation:
Université de Toulouse, Institut Mathématique de Toulouse, Département de Génie Mathématique, INSA de Toulouse, 135 avenue de Rangueil, 31077 Toulouse Cedex 4, France. h.benhassine@gmail.com; abendali@insa-toulouse.fr

Abstract

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This study is mainly dedicated to the development and analysis ofnon-overlapping domain decomposition methods for solving continuous-pressurefinite element formulations of the Stokes problem. These methods have thefollowing special features. By keeping the equations and unknowns unchanged atthe cross points, that is, points shared by more than two subdomains, one caninterpret them as iterative solvers of the actual discrete problem directlyissued from the finite element scheme. In this way, the good stabilityproperties of continuous-pressure mixed finite element approximations of theStokes system are preserved. Estimates ensuring that each iteration can beperformed in a stable way as well as a proof of the convergence of theiterative process provide a theoretical background for the application of therelated solving procedure. Finally some numerical experiments are given todemonstrate the effectiveness of the approach, and particularly to compare itsefficiency with an adaptation to this framework of a standard FETI-DP method.

Information

Type
Research Article
Copyright
© EDP Sciences, SMAI, 2010