Computation of Aerodynamic Sound around Complex Stationary and Moving Bodies

Aerodynamic sound generation at low Mach numbers around complex stationary and moving bodies is computed directly with an immersed-boundary method-based hybrid approach. The complex flow field is solved by the immersed-boundary incompressible Navier-Stokes flow solver and the sound generation and propagation are computed by the linearized perturbed compressible equations with a high-order immersed boundary method, on a non-body conformal Cartesian grid. The present method is applied to the prediction of noise generated by turbulent flow over a tandem cylinder arrangement as well as a rudimentary landing gear noise. For a moving body problem, the aerodynamic sound generated by modeled flapping wings is computed.