Aeroacoustic formulation based on compressible flow data

Abstract. The classical hybrid approach, of first performing an incompressible flow computation, evaluate the acoustic sources and finally compute the acoustic field does not consider any feedback of the acoustic field on the flow. Therefore, we propose the following approach: (1) Perform a compressible flow simulation on a restricted domain, which incorporates two-way coupling of flow and acoustics; (2) Filter the flow data by the Helmholtz-Hodge decomposition, such that we obtain a pure non-radiating field with which the acoustic sources are computed; (3) Perform the acoustic propagation computation. Computations of the sound generated by a flow over a cavity involving acoustic feedback show promising results and demonstrate the applicability of our approach.