Time-Domain Simulations of Problems in Ocean Acoustics

Abstract

A total-field scattered-field (TFSF) boundary can be used to introduce incident plane waves into finite-difference time-domain (FDTD) simulations. For fields which are traveling obliquely to the grid axes, there is no simple way to account fully for the effects of the inherent numerical artifacts associated with plane-wave propagation in the FDTD grid. Failure to account for these artifacts causes erroneous fields to leak across the TFSF boundary. The work performed under this grant developed a TFSF boundary for problems involving a planar interface that is theoretically exact. Such a boundary is essential when modeling the scattering from objects in the vicinity of ocean sediment. Although the TFSF boundary assumes a planar interface, the actual interface used in a simulation can take any shape and the space within the total-field region is arbitrary. A suite of C programs was written to implement the boundary.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 2006
Accession Number
ADA448246

Entities

People

  • John B. Schneider

Organizations

  • Washington State University

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustics
  • Boundaries
  • Discrete Fourier Transforms
  • Dispersion Relations
  • Electric Fields
  • Electromagnetic Fields
  • Finite Difference Time Domain
  • Frequency
  • Magnetic Fields
  • Plane Waves
  • Scattering
  • Simulations
  • Three Dimensional
  • Time Domain
  • Two Dimensional
  • Wave Propagation
  • Waves

Fields of Study

  • Physics

Readers

  • Allergy and Immunology.
  • Computational Fluid Dynamics (CFD)
  • Electromagnetic Wave Scattering and Antenna Radiation Engineering

Technology Areas

  • Space