FDTD (Finite-difference time-domain) method have been widely used for numerical analysis of sound wave propagation. In order to model the sound field having boundaries with detailed shape accurately by FDTD, usage of meshes with smaller size is necessary and it increases required memory and computational time. In order to decrease these computational costs, a subgridding scheme was applied. Sound field near the boundaries with detailed shape is discretized by subgrids with finer meshes, and the other fields are discretized by coarser meshes. In this study, numerical method of the subgridding scheme is described and the applicability of the method is discussed through numerical case studies for calculating head-related transfer functions. As a result, it has been confirmed that the total computational time by using subgridding scheme can be shortened with almost the same accuracy of the analysis as that by uniform-mesh FDTD.
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