Comparison of some methods used for prediction of atmospheric sound propagation
Keywords:Acoustic wave propagation, Calculations, Green's function, Numerical methods, Turbulence, Atmospheric sound propagation, Crank-Nicolson method
AbstractThe 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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