A hybrid method to simulate elastic wave scattering of three-dimensional objects.

A hybrid method based on the finite-difference method and equivalence principle to simulate elastic wave scattering of three-dimensional objects is proposed. In this method, the near fields are first calculated in a rectangular volume containing the object by the finite-difference method. Then the displacements and tractions on a virtual surface are transformed to the far field by the application of the equivalence principle in elastodynamics. The feasibility is verified by comparing modeling results with the analytical solution for the canonical point force source radiation problem. Modeling for complex scatterer structures shows the advantage of this method in handling multi-scale scattering problems.