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Breakdown of Streamwise Vortices near a Wall

  • J. D. Swearingen
  • R. F. Blackwelder
Conference paper
Part of the International Union of Theoretical and Applied Mechanics book series (IUTAM)

Abstract

Counter-rotating streamwise vortices within a laminar boundary layer were produced by a Görtler instability mechanism on a concave wall. Contour maps of constant streamwise velocity in the y–z plane normal to the mean flow revealed that the vortices produce strong distortions in the mean flow. Fluid was removed from the wall outward and produced regions where low speed fluid lay over higher momentum fluid. This highly unstable situation produced strongly inflectional profiles in both the normal and spanwise directions. Contour maps of the fluctuations suggest that the velocity oscillations are more closely related to the gradients in the spanwise direction rather than to the normal velocity gradient. The fluctuations broke down into turbulence at a Görtler number of approximately 9.

Keywords

Streamwise Velocity Laminar Boundary Layer Spanwise Direction Streamwise Vortex Eddy Structure 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer, Berlin Heidelberg New York 1983

Authors and Affiliations

  • J. D. Swearingen
    • 1
  • R. F. Blackwelder
    • 1
  1. 1.Department of Aerospace EngineeringUniversity of Southern CaliforniaLos AngelesUSA

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