The unsteady boundary-layer flow produced by a two-dimensional vortex in motion above an infinite plane wall in an otherwise stagnant fluid is considered in the limit of infinite Reynolds number. This study is part of a continuing investigation into the nature of the physical processes that occur near the surface in transitional and fully turbulent boundary layers. The adverse pressure gradient due to the vortex leads to the development of a zone of recirculation in the viscous flow near the surface, and the boundary-layer flow then focuses rapidly toward an eruption along a band which is very narrow in the streamwise direction. The evolution of the unsteady boundary layer is posed in Lagrangian co-ordinates and computed using an efficient, factored ADI numerical method. The boundary-layer solution is found to develop a separation singularity and to evolve toward a terminal stage which is generic in two-dimensional unsteady flows. The computed results are compared with the results of asymptotic theory of two-dimensional boundary-layer separation and the agreement is found to be excellent. See also the following abstract.

  • Supplemental Notes:
    • J Fluid Mechanics, v 232, Nov 1991, p 99 [33 p, 50 ref, 1 tab, 9 fig]
  • Authors:
    • Peridier, V J
    • Smith, F T
    • Walker, J D
  • Publication Date: 1991


  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00716240
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Feb 28 1996 12:00AM