Underwater low frequency sound field simulation with the digital waveguide mesh method

Abstract

Digital waveguide mesh method has been widely used to model musical instruments and simulation for room acoustics. In this paper, this method was applied to calculation the acoustic vector fields in the Pekeris waveguide. After introducing a boundary condition treatment method for the ocean bottom in the digital waveguide mesh, the acoustic pressure and particle velocity fields are calculated in spatial and temporal dimensions. Using these calculation results, the waveforms for the received signals and distribution of acoustic intensity in the underwater sound channel can also be obtained. Numerical simulation shows that the digital waveguide mesh method can be used to simulate the low frequency two‐dimensional acoustic vector fields in shallow water and this method is easy to applied to three‐dimensional acoustic fields calculation.