Perturbed convective wave equation for low-to-medium Mach number subsonic flows

A generalization of the perturbed convective wave equation is proposed. It allows extracting the acoustic field and the vortical dynamics from a compressible high-fidelity flow simulation. The wave equation computes the acoustic velocity potential, with a source term based on a source potential. This source potential describes the pressure dynamics of vortices and is identical to the incompressible pressure for incompressible-modeled flows. The application to an isothermal, subsonic two-dimensional mixing layer sound generation problem validates the wave equation. The results of the acoustic far-field pressure are comparable to the direct numerical reference solution, deviating less than 1 . 8 dB . • Generalized scalar Perturbed Convective Wave Equation. • Helmholtz Decomposition for Acoustic Field Extraction. • Insight into Aeroacoustic Source Mechanisms for vorticity dominated sound sources.