Simulation of acoustic scattering by the fast BEM approach

Boundary element method accelerated by the precorrected-FFT (pFFT) algorithm is developed and implemented for acoustic scattering problems. Because models with very fine meshes can be computed using this method, high frequency responses.can be simulated. In the implementation; constant triangular elements are applied. An example of a plane acoustic wave scattering by a rigid sphere is simulated to validate the in-house fast BEM code for acoustic scattering problems. Numerical results are compared with the corresponding analytical solutions and the solutions by the conventional boundary element method. As a result, the pFFT accelerated boundary element method greatly improve the computational efficiency and reduce the requirement of storage largely. The accuracy by this method is comparable to that by the conventional boundary element method as the grid-order is no less than 4.