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The mortar element method for three dimensional finite elements. (English) Zbl 0868.65082
The authors present the application of a new noncomforming domain decomposition approach – the mortar element method – to three-dimensional second-order elliptic problems written under a variational formulation. The case when finite element methods are used in each subdomain is considered. The possibility of dealing with tetrahedra for the finite element grid is shown. An analysis is given of the mortar element method that makes it possible to couple different spectral and finite element methods in adjacent subdomains in a flexible way.

65N30 Finite element, Rayleigh-Ritz and Galerkin methods for boundary value problems involving PDEs
65N55 Multigrid methods; domain decomposition for boundary value problems involving PDEs
35J25 Boundary value problems for second-order elliptic equations
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