The scientific field of aeroacoustics deals with the interaction between a background mean flow and an acoustic field propagating in this flow. In general, this concerns both the very complex description of the creation of sound by turbulence in the background flow, that is, flow induced noise and the influence the background mean flow has on the propagation of an externally created sound field, that is,
flow borne noise or
convected acoustics. The
computational aeroacoustics (CAA) capabilities of the aeroacoustics interfaces in COMSOL Multiphysics only cover the convected acoustics situation.
is the sum of the background mean pressure p0 and the acoustic pressure variations
p (sometimes labeled
p’ or
p1).