時間領域差分法を用いた超音波伝搬シミュレーションの並列演算による高速化

概要

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In recent years, a finite-difference time-domain (FDTD) method has been used to simulate various phenomena of ultrasonic wave propagations. The FDTD method has some advantages, e.g., it is able to easily calculate a temporal waveform because of a time-domain method. On the other hand, enormous computer performances, CPU and memory, are required for an accurate simulation in three dimensions (3D) because these requirements increase with the spatial region of the simulation model. In this study, the reduction of computation time and memory was attempted using four personal computers (PCs) connected with a local network. The exchanges of the data between PCs were performed by utilizing a message-passing interface (MPI). The ultrasonic pulse wave propagating through water-saturated honeycomb ceramics, that is the phantom of a cancellous bone, was simulated using the 3D FDTD method with parallel processing, and the computation time and memory used in this simulation were measured to evaluate the performance of the parallel FDTD method.
明石工業高等専門学校の論文