Accession Number:

ADA158037

Title:

Sensitivity to Mean Flow Parameters of the Low Wavenumber Content of the Wall Pressure under a Turbulent Boundary Layer.

Descriptive Note:

Final rept. 1 Dec 83-31 May 85,

Corporate Author:

CAMBRIDGE ACOUSTICAL ASSOCIATES INC MA

Personal Author(s):

Report Date:

1985-04-26

Pagination or Media Count:

45.0

Abstract:

The objective of this study is to examine the sensitivity of the low wavenumber portion of the wall pressure field under a turbulent boundary layer to both flow and wall conditions. The analytical procedure makes use of a method for calculating the broadband correlation function of the wall pressure field in which the specific flow characteristics enter through profiles of the mean velocity shear and turbulence intensity across the boundary layer. The basic assumption used to extend the results of this procedure to narrowband frequency characteristics is that there is a range of large spatial separations in which Strouhal scaling is not important. Several specific boundary layers are considered including flows on smooth and rough walls and in zero, favorable, and adverse pressure gradients. Results are presented for the point pressure, the spatial correlation function, and the low wavenumber spectral level. Keywords GHRGeneral Hydromechanics Research program Wall pressure fluctuations Low Wavenumber.

Subject Categories:

  • Numerical Mathematics
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE