Aeroacoustic formulation for flow-acoustic feedback

Using existing aeroacoustic wave equations, we propose a general hybrid aeroacoustic method, based on compressible flow data. By applying the Helmholtz-Hodge decomposition on arbitrary domains, we extract the incompressible projection (non-radiating base flow) of the compressible flow velocity by solving the vector valued curl-curl equation with the vorticity as forcing term. The resulting vortical flow part is used for computing the acoustic source term. Computations of the aeroacoustic benchmark case, cavity with a lip, which involve acoustic feedback, show promising results.