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A localized orthogonal decomposition method for semi-linearelliptic problems∗∗∗

Published online by Cambridge University Press:  13 August 2014

Patrick Henning
Affiliation:
Department of Information Technology, Uppsala University, Box 337, 75105 Uppsala, Sweden.
Axel Målqvist
Affiliation:
Department of Information Technology, Uppsala University, Box 337, 75105 Uppsala, Sweden.
Daniel Peterseim
Affiliation:
Institut für Numerische Simulation der Universität Bonn, Wegelerstr. 66, 53123 Bonn, Germany.. patrick.henning@uni-muenster.de

Abstract

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In this paper we propose and analyze a localized orthogonal decomposition (LOD) methodfor solving semi-linear elliptic problems with heterogeneous and highly variablecoefficient functions. This Galerkin-type method is based on a generalized finite elementbasis that spans a low dimensional multiscale space. The basis is assembled by performinglocalized linear fine-scale computations on small patches that have a diameter of orderH | log (H)| where H is the coarse mesh size. Without any assumptions onthe type of the oscillations in the coefficients, we give a rigorous proof for a linearconvergence of the H1-error with respect to the coarse meshsize even for rough coefficients. To solve the corresponding system of algebraicequations, we propose an algorithm that is based on a damped Newton scheme in themultiscale space.

Information

Type
Research Article
Copyright
© EDP Sciences, SMAI 2014