A novel numerical method for simulating wave propagation in moving media

A novel boundary integral method for simulating acoustic wave propagation in nonuniformly moving media is introduced. It is based on a generalized free-space Green's function which utilizes parameters obtained by solving the ray-tracing equations. Inserted into the Helmholtz integral, this approximate Green's function allows prediction of acoustic fields in moving media at low Mach numbers using the given boundary data. In order to validate the method, the acoustic field generated by a vibrating piston in a nonuniform shear flow is computed and compared with the results of a FEM simulation. Furthermore, an application of the method to simulation of wave propagation across a 2D cylindrical duct is presented.