Conference Proceedings

Sound extrapolation methods for turbulent flows based on indirect acoustic variables

S Zhong, X Zhang, CL Morfey, R Sandberg, R Fattah

2018 AIAA/CEAS Aeroacoustics Conference | Published : 2018

Abstract

In computing sound radiation from a turbulent flow, the far-field directivity solutions based on sound extrapolation methods can be contaminated if the expensive volume integrals are neglected while the non-acoustic fluctuations are collected on the integration surface. In earlier work by the first two authors, a sound extrapolation method was developed by filtering out the eddies before the far-field computation. A convection operator Dc was applied on the pressure fluctuation p′ under the assumption that the motion of the eddies is mainly convected by the mean flow, as indicated by Taylor's hypothesis. Good results were obtained when the method was applied to typical aeroacoustic problems...

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