Comparison of some methods used for prediction of atmospheric sound propagation

Authors

  • Marta Galindo Natl Research Council, Ottawa, Canada
  • Michael R. Stinson Natl Research Council, Ottawa, Canada
  • Gilles Daigle Natl Research Council, Ottawa, Canada

Keywords:

Acoustic wave propagation, Calculations, Green's function, Numerical methods, Turbulence, Atmospheric sound propagation, Crank-Nicolson method

Abstract

The sound field in inhomogeneous atmospheric conditions above an impedance plane is computed using three different numerical procedures, to assess their advantages and disadvantages. Two implementations of the parabolic equation are considered, the Green's function method and a Crank-Nicolson method; these are contrasted with a version of the fast field program. As test cases, both upward and downward refracting conditions are considered, with and without turbulence. Calculations made using the Green's function implementation are considerably faster, making it the method of choice when large numbers of calculations (as when many realizations of turbulence are required) are necessary. However, considerable care is required in setting computational parameters and parallel calculations with one of the other techniques for validation is advisable.

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Published

1997-12-01

How to Cite

1.
Galindo M, Stinson MR, Daigle G. Comparison of some methods used for prediction of atmospheric sound propagation. Canadian Acoustics [Internet]. 1997 Dec. 1 [cited 2021 Sep. 25];25(4):3-11. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1105

Issue

Section

Technical Articles