並列演算FDTD法による浅海内の音波伝搬解析

抄録

The numerical analysis method of sound propagation is developed in ultrasonic field because calculating performance of the personal computer improved in very high pace. Finite Difference Time Domain (FDTD) method is very useful method to calculate the sound propagation in the field, although it is requires very large memory and long calculation time. In order to shorten the calculation time of FDTD method, we proposed a new algorithm of parallel calculation using Message-Passing Interface (MPI).
In this paper, we proposed a new algorithm of parallel computing using MPI in Personal Computer (PC) clusters to shorten the calculation time of FDTD method. PC clusters with 8 nodes in connected by gigabit Ethernet is used for calculation. In order to confirm the accuracy of calculation, we calculated sound propagation in homogenous media, and calculated propagation of sound pulse in shallow water. As a result, it is shown that FDTD method with parallel processing can be calculated accurately in sound propagation model. The calculation speed becomes about 6 times of normal personal computer in shallow water model. It is clear that FDTD method with parallel processing is very efficient method for numerical analysis of sound propagation.