The numerical modeling of acoustic wave propagation using the multiple pressure variables approach

摘要

Based on an asymptotic analysis of the compressible Navier–Stokes equations, the basic concept of the Multiple Pressure Variables (MPV) approach is to split up the pressure into three different terms representing global background effects, acoustic waves and the incompressible pressure, respectively. Special attention is payed to aeroacoustic phenomena and the numerical treatment of the generation and spreading of sound waves. To this aim, further perturbation analysis is done about the incompressible limit solution. This gives hints how to extract acoustic waves responsible for the noise generation from the flow field.