Described are the results of an experimental study of a well-developed, turbulent boundary layer on a smooth, flat surface encountering an area of much rougher surface. The roughened area is a strip with its length extending in the direction of the mean flow but of finite width in the surface direction normal to the flow. The resulting three-dimensional flow differs significantly from previously studied cases involving step changes in roughness of infinite extent in the direction normal to the flow. Extensive experiments were carried out in a wind tunnel having a length of nearly 100 ft (30.5 m) with a boundary layer thickness of the order of 18-20 in. (0.5 m). Pitot tube and hot-wire anemometer measurements were made of mean velocity and Reynolds stress quantities in great detail throughout the flow field.

  • Supplemental Notes:
    • Project Themis Tech Report.
  • Corporate Authors:

    Colorado State University, Fort Collins

    Fort Collins, CO  United States  80523
  • Authors:
    • Edling, W H
    • Cermak, J E
  • Publication Date: 1974-4

Media Info

  • Features: References;
  • Pagination: 245 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00130867
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Report/Paper Numbers: No. 27
  • Files: TRIS
  • Created Date: Apr 7 1976 12:00AM