University of Tasmania
Browse

File(s) under permanent embargo

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

journal contribution
posted on 2023-05-17, 20:05 authored by Johnston, PR, Johnston, BM, David ElliottDavid Elliott

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.

History

Publication title

Engineering Analysis with Boundary Elements

Volume

37

Issue

4

Pagination

708-718

ISSN

1873-197X

Department/School

School of Natural Sciences

Publisher

Pergamon

Place of publication

United Kingdom

Rights statement

Copyright 2013 Elsevier

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the mathematical sciences

Usage metrics

    University Of Tasmania

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC