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Using the iterated sinh transformation to evaluate two dimensional nearly singular boundary element integrals


Johnston, PR and Johnston, BM and Elliott, D, Using the iterated sinh transformation to evaluate two dimensional nearly singular boundary element integrals, Engineering Analysis with Boundary Elements, 37, (4) pp. 708-718. ISSN 1873-197X (2013) [Refereed Article]

Copyright Statement

Copyright 2013 Elsevier

DOI: doi:10.1016/j.enganabound.2013.01.013


Recently, sinh transformations have been proposed to evaluate nearly weakly singular integrals which arise in the boundary element method. These transformations have been applied to the evaluation of nearly weakly singular integrals arising in the solution of Laplace's equation in both two and three dimensions and have been shown to evaluate the integrals more accurately than existing techniques.

More recently, the sinh transformation was extended in an iterative fashion and shown to evaluate one dimensional nearly strongly singular integrals with a high degree of accuracy. Here the iterated sinh technique is extended to evaluate the two dimensional nearly singular integrals which arise as derivatives of the three dimensional boundary element kernel. The test integrals are evaluated for various basis functions and over flat elements as well as over curved elements forming part of a sphere.

It is found that two iterations of the sinh transformation can give relative errors which are one or two orders of magnitude smaller than existing methods when evaluating two dimensional nearly strongly singular integrals, especially with the source point very close to the element of integration. For two dimensional nearly weakly singular integrals it is found that one iteration of the sinh transformation is sufficient.

Item Details

Item Type:Refereed Article
Keywords:non-linear coordinate transformation, boundary element method, nearly singular integrals, numerical integration, sinh transformation
Research Division:Mathematical Sciences
Research Group:Applied mathematics
Research Field:Theoretical and applied mechanics
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the mathematical sciences
UTAS Author:Elliott, D (Professor David Elliott)
ID Code:87009
Year Published:2013
Web of Science® Times Cited:17
Deposited By:Mathematics and Physics
Deposited On:2013-11-05
Last Modified:2015-01-27

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