COMPUTATIONAL AEROACOUSTICS SIMULATIONS USING THE EXPANSION ABOUT INCOMPRESSIBLE FLOW APPROACH

摘要

A series of two-dimensional numerical simulations is conducted in an effort to understand the behavior and validate the performance of a split hydrodynamic-acoustic computational aeroacoustics approach coupled with a specially tailored nonreflecting boundary condition. Validation cases considered include the classic aeroacoustic problem of the spinning vortex pair, the far-field aeolian tone prediction for a cylinder in crossflow, and the prediction of sound generation in a shear layer. In all cases good results are obtained based on comparisons with analytical solutions, experimental measurements, and direct numerical simulations. The split computational aeroacoustics approach is shown to be a cost-effective method for computing sound generation and propagation for a wide range of flows, including flows with noncompact source regions.