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.

Media Info

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

Subject/Index Terms

Filing Info

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