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An a posteriori error estimator for anisotropic refinement. (English) Zbl 0873.65098
From the author’s summary: Besides an algorithm for local refinement, an a posteriori error estimator is a basic tool of every adaptive method. Using information generated by such an error estimator the refinement of the grid is controlled. For second-order elliptic problems an error for anisotropically refined grids (like $$n-D$$ cuboidal and $$3-D$$ prismatic grids) is presented. This error estimator gives correct information about the size of the error and generates information about the direction into which some elements have to be refined to reduce the error in a proper way. A number of numerical examples for $$2-D$$ rectangular and $$3-D$$ prismatic grids are presented.

##### MSC:
 65N15 Error bounds for boundary value problems involving PDEs 65N30 Finite element, Rayleigh-Ritz and Galerkin methods for boundary value problems involving PDEs 65N50 Mesh generation, refinement, and adaptive methods for boundary value problems involving PDEs 35J25 Boundary value problems for second-order elliptic equations
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