A Tailored Finite Point Method for a Singular Perturbation Problem on an Unbounded Domain

Authors:
Houde Han;Zhongyi Huang;R. Bruce Kellogg
Affiliations:
Dept. of Mathematical Sciences, Tsinghua University, Beijing, China 100084;Dept. of Mathematical Sciences, Tsinghua University, Beijing, China 100084;Department of Mathematics, University of South Carolina, Columbia, USA 29208
Venue:
Journal of Scientific Computing
Year:
2008

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Abstract

In this paper, we propose a tailored-finite-point method for a kind of singular perturbation problems in unbounded domains. First, we use the artificial boundary method (Han in Frontiers and Prospects of Contemporary Applied Mathematics, [2005]) to reduce the original problem to a problem on bounded computational domain. Then we propose a new approach to construct a discrete scheme for the reduced problem, where our finite point method has been tailored to some particular properties or solutions of the problem. From the numerical results, we find that our new methods can achieve very high accuracy with very coarse mesh even for very small 驴. In the contrast, the traditional finite element method does not get satisfactory numerical results with the same mesh.