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READILY COMPUTABLE GREEN'S AND NEUMANN FUNCTIONS FOR SYMMETRY-PRESERVING TRIANGLES

R. D. HAZLETT and D. K. BABU
Quarterly of Applied Mathematics
Vol. 67, No. 3 (September 2009), pp. 579-592
Published by: Brown University
Stable URL: http://www.jstor.org/stable/43638889
Page Count: 14
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
READILY COMPUTABLE GREEN'S AND NEUMANN FUNCTIONS FOR SYMMETRY-PRESERVING TRIANGLES
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Abstract

Neumann and Green's functions of the Laplacian operator on 30-60-90° and 45-45-90° triangles can be generated with appropriately placed multiple sources/sinks in a rectangular domain. Highly accurate and easily computable Neumann and Green's function formulas already exist for rectangles. The extension to equilateral triangles is illustrated. In applications, closed-form expressions can be constructed for the potential, the streamfunction, or the various spatial derivatives of these properties. The derivation of analytic line integrals of these functions allows the proper handling of singularities and facilitates extended applications to problems on domains with open boundaries. Using a boundary integral method, it is demonstrated how one can construct semi-analytical solutions to problems defined on domains that exhibit spatially-dependent properties (heterogeneous media) or possess irregular boundaries.

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