Journal Article

Acoustic scattering by an arbitrarily shaped body: an application of the boundary-element method

Tsuyoshi Okumura, Toshikazu Masuya, Yoshimi Takao and Kouichi Sawada

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 60, issue 3, pages 563-570
Published in print January 2003 | ISSN: 1054-3139
Published online January 2003 | e-ISSN: 1095-9289 | DOI: http://dx.doi.org/10.1016/S1054-3139(03)00060-2
Acoustic scattering by an arbitrarily shaped body: an application of the boundary-element method

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The boundary-element method (BEM) is applied to calculate target strength (TS) and extinction cross-section of a scatterer. The scattering amplitudes of four types of prolate spheroid, namely, the vacant, rigid, liquid-filled, and gas-filled, are calculated using the BEM. Comparison between the results of the BEM and the prolate-spheroid model (PSM), which is a numerical calculation using spheroidal-wave functions, shows excellent agreement for the vacant, rigid, and liquid-filled spheroids. The TS of a gas-filled prolate spheroid, calculated by the BEM, shows resonance at a low frequency. The lowest resonant frequency, the peak ratio, and the quality factor (Q) of this resonance are compared with those given by the T-matrix and an analytical solution. Again the results show excellent agreement.

Keywords: boundary-element method; Kirchhoff approximation; extinction cross-section; target strength

Journal Article.  3840 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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