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 is found to differ significantly from previously studied cases involving step changes in roughness of infinite extent in the direction normal to the flow. Extensive experiments are reported in a wind tunnel having a length of nearly 100 ft with a boundary layer thickness of the order of 18-20 in. Pitot tube and hot-wire anemometer measurements were made of mean velocity and Reynolds stress quantities throughout the flow field. Secondary flow components were measured by a new x-wire technique. (Modified author abstract)

  • Corporate Authors:

    Colorado State University, Fort Collins

    Fluid Dynamics and Diffusion Laboratory
    Fort Collins, CO  United States  80523

    Office of Naval Research

    Department of the Navy, 800 North Quincy Street
    Arlington, VA  United States  22217
  • Authors:
    • Edling, W H
    • Cermak, J E
  • Publication Date: 1974-4

Media Info

  • Pagination: 261 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00084308
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: CER73-74WHE-JEC34 Tech. Rpt., THEMIS-CER-TR-27
  • Contract Numbers: N00014-68-A0493-0001
  • Files: TRIS
  • Created Date: Jun 26 1975 12:00AM