Galerkin Boundary Integral Analysis for the 3D Helmholtz Equation
A linear element Galerkin boundary integral analysis for the three-dimensional Helmholtz equation is presented. The emphasis is on solving acoustic scattering by an open (crack) surface, and to this end both a dual equation formulation and a symmetric hypersingular formulation have been developed. A...
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Published in | Computer methods in applied mechanics and engineering Vol. 58; no. 3 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
United States
01.01.2010
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Subjects | |
Online Access | Get full text |
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Summary: | A linear element Galerkin boundary integral analysis for the three-dimensional Helmholtz equation is presented. The emphasis is on solving acoustic scattering by an open (crack) surface, and to this end both a dual equation formulation and a symmetric hypersingular formulation have been developed. All singular integrals are defined and evaluated via a boundary limit process, facilitating the evaluation of the (finite) hypersingular Galerkin integral. This limit process is also the basis for the algorithm for post-processing of the surface gradient. The analytic integrations required by the limit process are carried out by employing a Taylor series expansion for the exponential factor in the Helmholtz fundamental solutions. For the open surface, the implementations are validated by comparing the numerical results obtained by using the two different methods. |
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Bibliography: | DE-AC05-00OR22725 USDOE Office of Science (SC) |
ISSN: | 0045-7825 1879-2138 |