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[01101] Supersonic Pre-Transitional Disturbances in Boundary Layers on Porous Surfaces

  • Session Time & Room : 5D (Aug.25, 15:30-17:10) @E817 A715
  • Type : Contributed Talk
  • Abstract : The effect of wall permeability on the response of pre-transitional supersonic boundary layers subject to low-amplitude, free-stream vortical disturbances is investigated via asymptotic methods and numerically. Equally-spaced cylindrical pores couple the pressure and wall-normal velocity fluctuations when the spanwise diffusion is negligible, thereby reducing the growth of low-frequency laminar streaks and Görtler vortices on concave porous walls. Highly-oblique Tollmien-Schlichting waves that develop further downstream are instead enhanced. This finding is confirmed by a triple-deck analysis.
  • Classification : 76N20, 76N25, 35C20
  • Format : Talk at Waseda University
  • Author(s) :
    • Ludovico Fossà (The University of Sheffield)
    • Pierre Ricco (The University of Sheffield)