SONDERFORSCHUNGSBEREICH 393: NUMERISCHE SIMULATION AUF MASSIV-PARALLELEN RECHNERN, TECHNISCHE UNIVERSITÄT CHEMNITZ

Grosman, Serguei : Robust local problem error estimation for a singularly perturbed reaction-diffusion problem on anisotropic finite element meshes

Author(s):

Grosman, Serguei

Title:

Robust local problem error estimation for a singularly perturbed reaction-diffusion problem on anisotropic finite element meshes

Preprint series:

Technische Universität Chemnitz, SFB 393 (Germany), SFB393-Preprint 7, 2002

Mathematics Subject Classification:

65N15			[ Error bounds ]
65N30			[ Finite elements, Rayleigh-Ritz and Galerkin methods, finite methods ]
65N50			[ Mesh generation and refinement ]

Abstract:

Singularly perturbed reaction-diffusion problems exhibit in general solutions with anisotropic features, e.g. strong boundary and/or interior layers. This anisotropy is reflected in the discretization by using meshes with anisotropic elements. The quality of the numerical solution rests on the robustness of the a posteriori error estimator with respect to both the perturbation parameters of the problem and the anisotropy of the mesh. An estimator that has shown to be one of the most reliable for reaction-diffusion problem is the {\it equilibrated residual method} and its modification done by Ainsworth and Babu\v{s}ka for singularly perturbed problem. However, even the modified method is not robust in the case of anisotropic meshes. The present work modifies the equilibrated residual method for anisotropic meshes. The resulting error estimator is equivalent to the equilibrated residual method in the case of isotropic meshes and is proved to be robust on anisotropic meshes as well. A numerical example confirms the theory.

Keywords:

a posteriori error estimation, singular perturbations, reaction-diffusion problem, robustness, anisotropic solution, stretched elements

Language:

English

Publication time:

5 / 2002