Extraction and Investigation of the Large Scale Structure of Pressure Distribution in a Compressible Turbulent Boundary Layer

Abstract

In order to investigate turbulence structures and to clarify the sustaining mechanism of aeroacoustic sound sources in wall turbulence in the future, a turbulent boundary layer of compressible flow was simulated by using the direct numerical simulation technique. After that, the characteristics of large scale and fine scale pressure structures were observed by applying a spatial filter to the structures of pressure distribution. The simulation results showed that the large scale structures are correlated with pressure fluctuation on the wall surface. In addition, the frequency of the growing large scale structures corresponded to the frequency of the propagating pressure wave. The analysis results suggested that the large scale structures could be associated with sound sources.