An Adaptive Local (AL) Basis for Elliptic Problems with Complicated Discontinuous Coefficients |
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Authors: | Monika Weymuth Stefan Sauter |
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Affiliation: | Institut für Mathematik, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich |
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Abstract: | We develop a generalized finite element method for the discretization of elliptic partial differential equations in heterogeneous media. In [5] a semidiscrete method has been introduced to set up an adaptive local finite element basis (AL basis) on a coarse mesh with mesh size H which, typically, does not resolve the matrix of the media while the textbook finite element convergence rates are preserved. This method requires O(log(1/H)d+1) basis functions per mesh point where d denotes the spatial dimension of the computational domain. We present a fully discrete version of this method, where the AL basis is constructed by solving finite-dimensional localized problems, and which preserves the optimal convergence rates. (© 2015 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim) |
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