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.

• Supplemental Notes:
  • Australas Conf on Hydraul and Fluid Mech, 5th, Proceedings, V1, Univ of Canterburg, Christchurch, NZ, Dec. 9-13, 1974.
• Corporate Authors:

  University of Canterbury

  Christchurch,   New Zealand 
• Authors:
  • Mulhearn, P J
• Conference:
  • Australas Conf on Hydraul and Fluid Mech, 5th, Proceedings, V1, Univ of Canterburg, Christchurch, NZ, Dec. 9-13, 1974.
• Publication Date: 1974

Media Info

• Features: References;
• Pagination: p. 568-574

Subject/Index Terms

• TRT Terms: Atmospheric pressure; Pressure fields; Roughness; Shear stress; Walls
• Old TRIS Terms: Pressure fluctuations; Wall shear stress
• Subject Areas: Design; Marine Transportation;

Filing Info

• Accession Number: 00129876
• Record Type: Publication
• Source Agency: Engineering Index
• Files: TRIS
• Created Date: Mar 10 1976 12:00AM