Abstract
A finite difference analysis method is developed to simulate outdoor sound propagation under the influence of inhomogeneous or unsteady meteorological conditions by applying the separable solution of aeroacoustics to the outdoor sound. It is verified that the perfectly reflecting boundary on ground surfaces and the nonreflective boundary to realize the sound transmission from finite domain to infinite domain virtually perform properly in the numerical analysis. Then the numerical analysis precisely simulated the advective effect of wind on sound propagation and the change of sound wavelength due to the difference of air temperature. Furthermore, a shadow zone of acoustic waves was identified from the computation of sound propagation with the nonuniform vertical distribution of wind flow.
