Publication:
Low frequency acoustic intensity propagation modeling in shallow water waveguides

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Authors
Moss, Geoffrey R.
Subjects
wave propagation
normal modes
parabolic equation
finite element method
acoustic intensity
linear acoustics
PACS codes are: 43.20.-f general linear acoustics
43.20.Mv waveguides
wave propagation in tubes and ducts
43.30.Bp normal mode propagation of sound in water
43.30.Gv backscattering
echoes
and reverberation in water due to combinations of boundaries
Advisors
Smith, Kevin B.
Howarth, Thomas R.
Date of Issue
2016-06
Date
16-Jun
Publisher
Monterey, California: Naval Postgraduate School
Language
Abstract
Three popular numerical techniques are employed to examine the acoustic pressure and intensity features present in several environments of interest. Free field propagation and analytically tractable planar interfacial two-fluid transmission and reflection are used to benchmark the commercial software package COMSOL. Canonical Pekeris-type waveguides are used as initial points of comparison to illustrate COMSOL's ability to capture all pertinent physics. Additional environments with non-trivial bathymetry and varying sound speed profiles are then used to examine the rich feature set anticipated in experimental data. Predictions of recently estimated and experimentally verified physical phenomena serve as further proof of the accuracy of implementation of the Finite Element Method. Guidelines and recommendations are provided for future studies using COMSOL along with circumstances under which traditional treatment of the air-water interface is appropriate and when an explicit full-physics model is required.
Type
Thesis
Description
Series/Report No
Department
Engineering Acoustics Academic Committee
Organization
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NPS Report Number
Sponsors
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Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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