An integral boundary-layer method is examined for its applicability to unsteady turbulent boundary layers. The method employs an analytical velocity profile formulation modeled after the law of the wall and the law of the wake and recently applied successfully to calculation of steady separated turbulent boundary layers. Analytical solutions developed from a small perturbation analysis indicate the method is valid for unsteady flow over a certain range of frequencies. Good comparisons were obtained between the linearized theory and results produced by a finite-difference solution of the complete nonlinear unsteady boundary-layer equations. Examination of the nature of the integral equations in the vicinity of a point of zero wall shear stress indicates that that point does not necessarily correspond to a point of separation in unsteady flow. That result is also consistent with the results of other researchers. (Author)

  • Supplemental Notes:
    • Prepared in cooperation with Nielsen Engineering and Research, Inc., Mountain View, Calif.
  • Corporate Authors:

    Purdue University

    Project Squid Headquarters
    Lafayette, Indiana,   United States 
  • Authors:
    • Kuhn, G D
    • Nielsen, J N
  • Publication Date: 1973-10

Media Info

  • Pagination: 41 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00051778
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: SQUID-TR-NEAR-2-PU Tech Rpt
  • Contract Numbers: N00014-67-0226-0005
  • Files: TRIS
  • Created Date: Mar 25 1974 12:00AM