Low Frequency Acoustic Intensity Propagation Modeling in Shallow Water Waveguides

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 COMSOLs 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.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 2016
Accession Number
AD1026729

Entities

People

  • Geoffrey R. Moss

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Energy and Power Technologies
  • Sensors

DTIC Thesaurus Topics

  • Accuracy
  • Acoustic Propagation
  • Acoustic Properties
  • Acoustic Waves
  • Acoustics
  • Computational Science
  • Differential Equations
  • Experimental Data
  • Finite Element Analysis
  • Frequency
  • Geometry
  • Helmholtz Equations
  • Physics
  • Reflection
  • Shallow Water
  • Two Dimensional
  • Wave Propagation

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Mathematical Modeling and Probability Theory.
  • Ocean-Atmosphere Mesoscale Modeling, Data Assimilation, and Flux Boundary Layers