CALCULATIONS OF UNSTEADY TURBULENT BOUNDARY LAYERS WITH FLOW REVERSAL

The present studies relate to incompressible time-dependent flow over a two-dimensional surface which is flat or of large radius. The paper reports the results of a series of computational experiments aimed at studying the characteristics of time-dependent turbulent boundary layers with embedded reversed-flow regions. A calculation method, developed earlier by the authors and their co-workers, was extended to boundary layers with reversed flows for this purpose. The calculations were performed for an idealized family of external velocity distributions, and covered a range of degress of unsteadiness. The results confirmed those of previous studies in demonstrating that the point of flow reversal is nonsingular in a time-dependent boundary layer. However, a singularity was observed to develop downstream of reversal, under certain conditions, accompanied by the breakdown of the boundary-layer approximations.

  • Corporate Authors:

    National Aeronautics and Space Administration

    400 Maryland Avenue, SW
    Washington, DC  USA  20546
  • Authors:
    • Nash, J F
    • Patel, V C
  • Publication Date: 1975-5

Media Info

  • Features: References;
  • Pagination: 46 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00127015
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Report/Paper Numbers: CR-2546 Contra Rpt
  • Files: TRIS
  • Created Date: Nov 5 1975 12:00AM