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 2013 Elsevier
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 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)|
|Web of Science® Times Cited:||16|
|Deposited By:||Mathematics and Physics|
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