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Zbl 1001.65115
Li, Zhilin; Ito, Kazufumi
Maximum principle preserving schemes for interface problems with discontinuous coefficients. (English)
[J] SIAM J. Sci. Comput. 23, No.1, 339-361 (2001). ISSN 1064-8275; ISSN 1095-7197/e

The authors consider the elliptic problem $$ (\beta u_x)_{x}+(\beta u_y)_{y}- \kappa(x,y)u=f(x,y) $$ in a domain $\Omega$ that contains a smooth curve $\Gamma$ across which $\beta$ and $f$ may have jump discontinuities. The standard 5-point finite difference scheme is set up but modified near $\Gamma$ in such a way that a discrete maximum principle is valid while the resulting scheme exhibits overall first order acuracy. Based on these properties convergence is proved. The authors study also a second order scheme starting from the 9-point finite difference stencil. The needed properties are in this case verified numerically. Numerical examples illustrate the theoretical results.
[Rolf Dieter Grigorieff (Berlin)]

MSC 2000:: *65N06 Finite difference methods (BVP of PDE)
35J25 Second order elliptic equations, boundary value problems
35R05 PDE with discontinuous coefficients or data
65N12 Stability and convergence of numerical methods (BVP of PDE)
65N50 Mesh generation and refinement (BVP of PDE)

Keywords: elliptic interface problem; finite differences; maximum principle; discontinuous data; convergence; numerical examples

Cited in: Zbl 1118.65389 Zbl 1062.65129 Zbl 1051.65116

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