BOUNDARY LAYER WALL-PRESSURE FLUCTUATIONS NEAR AN ABRUPT CHANGE IN SURFACE ROUGHNESS
The wall-pressure fluctuations beneath a turbulent boundary layer have been investigated immediately down stream from an abrupt change in surface roughness, the change being from a slightly-rough to a very-rough surface. It is shown that the r.m.s. pressure decreases slightly at first, then rises to a peak value about 250 mm from the change in surface roughness before decreasing once more. Pressure spectra for a range of free-stream velocities and at various stations in the first 150 mm scale on wall variables. Further downstream this behavior breaks down.
- Australas Conf on Hydraul and Fluid Mech, 5th, Proceedings, V1, Univ of Canterburg, Christchurch, NZ, Dec. 9-13, 1974.
University of CanterburyChristchurch, New Zealand
- Mulhearn, P J
- Publication Date: 1974
- Features: References;
- Pagination: p. 568-574
- TRT Terms: Atmospheric pressure; Pressure fields; Roughness; Shear stress; Walls
- Old TRIS Terms: Pressure fluctuations; Wall shear stress
- Subject Areas: Design; Marine Transportation;
- Accession Number: 00129876
- Record Type: Publication
- Source Agency: Engineering Index
- Files: TRIS
- Created Date: Mar 10 1976 12:00AM