THREE-DIMENSIONAL BOUNDARY LAYER FLOW ON ROUGHNESS STRIP OF FINITE WIDTH

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

• TRT Terms: Boundary layer; Reynolds stress; Roughness; Turbulence; Turbulent boundary layer; Velocity
• Old TRIS Terms: Reynolds stresses; Velocity profiles
• Subject Areas: Design; Marine Transportation;

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