Abstract
Sound propagating outdoors is influenced by turbulent fluctuations of the atmosphere. Unfortunately, theories only exist in limited configurations and outdoor experimentation is difficult. Numerical simulation is a good alternative for fully understanding the physics in place. The Finite-Difference Time-Domain (FDTD) model has already proven to reproduce many aspects of linear acoustics. It remains to demonstrate that it catches the physics of turbulence-induced effects. This is the aim of this contribution. FDTD simulations of sound propagation through turbulent atmosphere are performed. The general behavior and the statistical characteristics of the sound field are evaluated and compared to available theories. In the limiting configurations of weak or strong (saturated) sound perturbations, the simulations are in excellent agreement with the tested theories. In the intermediate configurations, some theoretical results agree with the simulations, while others show notable discrepancies. For example, the FDTD results suggest that there is a significant correlation between phase and amplitude fluctuations. These findings generally suggest that FDTD is an appropriate modeling tool to investigate sound propagation through complex configurations of the atmospheric fluctuations.
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