Three-dimensional finite difference-time domain simulation of moving sound source and receiver

In this paper, moving sound source and receiver with an arbitrary trajectory are implemented in the three-dimensional compact explicit finite-difference time-domain method. To implement a moving sound source, a driving method in which the grid points around the source position are driven by the source distribution function is proposed. It is confirmed that the Gaussian distribution driving is suitable for the analysis of the moving sound sources. For a moving receiver, the sound pressure at the receiver is interpolated from the sound pressures of the adjacent eight grid points. The formulations and the numerical experiments are made for the three-dimensional sound field, and the accuracy of the proposed method is discussed. It is confirmed that the proposed method can be applied accurately to the moving sound source and receiver including the Doppler effect.