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A three-dimensional, longitudinally-invariant finite element model for acoustic propagation in shallow water
Marcia J Isakson1, Benjamin Goldsberry1, Nicholas P Chotiros1
1Applied Research Laboratories, The University of Texas at Austin, Austin, Texas 78713-8029 misakson@arlut.utexas.edu, goldsbe@arlut.utexas.edu, chotiros@arlut.utexas.edu.
Abstract:
A three-dimensional, longitudinally-invariant finite element (FE) model for shallow water acoustic propagation is constructed through a cosine transform of a series of two-dimensional FE models at different values of the out-of-plane wavenumber. An innovative wavenumber sampling method is developed that efficiently captures the essential components of the integral as the out-of-plane wave number approaches the water wavenumber. The method is validated by comparison with benchmark solutions of two shallow water waveguide environments: a flat range independent case and a benchmark wedge.
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