三维声波散射的时域仿真

Time Domain Simulation of Three Dimensional Acoustic Scattering

为了研究医学超声中的动态波散射问题,建立了三维声波的速度-压力交错网格时域有限差分模型,讨论了完全匹配层吸收边界的构建及其时域有限差分算法的实现,分析了吸收边界的性能.三维声波场中标准目标散射的动态仿真验证了该计算方法的有效性.

In order to study the dynamic wave scattering in medical ultrasonic diagnosis,the finite-difference time domain method is applied to solve the three-dimensional acoustic scattering in time domain.Three-dimensional model of the velocity-stress staggered-grid finite-difference on acoustic waves has been established.The construction of perfectly matched layer（PML） is discussed,and the finite-difference scheme of the PML boundary conditions is implemented.The property of the PML is analyzed.Active simulation of the scattering of standard three-dimensional object has been finished.Numerical experiments have proved the effectiveness of the proposed algorithm.