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Journal of the Acoustical Society of America

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Jun 2010

Volume 127, Issue 6, pp. EL235-3881

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Finite-element modeling of depth and range dependent acoustic propagation in oceanic waveguides

Chiruvai P. Vendhan, Ganesh C. Diwan, and Subrata K. Bhattacharyya

J. Acoust. Soc. Am. Volume 127, Issue 6, pp. 3319-3326 (2010); (8 pages)

Online Publication Date: 09 Jun 2010

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Show Abstract
Finite-element models (FEMs) of ocean acoustic waveguides are capable of predicting the full wave solution including the effect of inhomogeneities and interfaces. However the method appears computationally feasible at present only for low to intermediate frequencies. The FEM discussed in this paper treats the radiation boundary condition involving multiple propagating modes using a penalty function approach. The effect of a point source has been represented as a pressure boundary condition on a small boundary surrounding the source. The FEM has been validated with a few examples of ideal waveguides. The FE results for a range and depth dependent parallel waveguide—an ASA benchmark problem [ F. B. Jensen and C. M. Ferla, J. Acoust. Soc. Am. 87, 1499–1520 (1990) ]—compare well with published results.
Show PACS
43.20.Mv Waveguides, wave propagation in tubes and ducts
43.30.Bp Normal mode propagation of sound in water
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