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Exterior stable domain segmentation integral equation method for scattering problems
Author(s) -
Zeng Xiaogang,
Bielak Jacobo
Publication year - 1994
Publication title -
international journal for numerical methods in engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.421
H-Index - 168
eISSN - 1097-0207
pISSN - 0029-5981
DOI - 10.1002/nme.1620370505
Subject(s) - integral equation , discretization , mathematics , mathematical analysis , algebraic equation , boundary (topology) , domain (mathematical analysis) , scattering , harmonic , boundary value problem , field (mathematics) , plane (geometry) , geometry , physics , optics , acoustics , pure mathematics , quantum mechanics , nonlinear system
Abstract This paper is concerned with the development of an exterior domain segmentation method for the solution of two‐ or three‐dimensional time‐harmonic scattering problems in acoustic media. This method, based on a variational localized , symmetric, boundary integral equation formulation leads, upon discretization, to a sparse system of algebraic equations whose solution requires only O ( N ) multiplications, where N is the number of unknown nodal pressures on the scatterer surface. The new procedure is analogous to the one developed recently 1 except that in the present formulation we avoid completely the use of the hypersingular operator, thereby reducing the computational complexity. Numerical experiments for a rigid circular cylindrical scatterer subjected to a plane incident wave serve to assess its accuracy for normalized wave numbers, ka , ranging from 0 to 30, both directly on the scatterer and in the far field, and to confirm that, contrary to standard boundary integral equation formulations, the present procedure is valid for critical frequencies.