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Turbulent boundary layers subjected to multiple curvatures and pressure gradients

Published online by Cambridge University Press:  26 April 2006

Promode R. Bandyopadhyay  and
Anwar Ahmed
Promode R. Bandyopadhyay
Affiliation:
Mail Stop 170, NASA Langley Research Center Hampton, VA 23665–5225, USA Present address: Code 8234, Naval Undersea Warfare Center Division, Newport, RI 02841–5047, USA.
Anwar Ahmed
Affiliation:
Mail Stop 170, NASA Langley Research Center Hampton, VA 23665–5225, USA On leave from: Aero. Department, Texas A. & M. University.
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Abstract

The effects of abruptly applied cycles of curvatures and pressure gradients on turbulent boundary layers are examined experimentally. Two two-dimensional curved test surfaces are considered: one has a sequence of concave and convex longitudinal surface curvatures and the other has a sequence of convex and concave curvatures. The choice of the curvature sequences were motivated by a desire to study the asymmetric response of turbulent boundary layers to convex and concave curvatures. The relaxation of a boundary layer from the effects of these two opposite sequences has been compared. The effect of the accompanying sequences of pressure gradient has also been examined but the effect of curvature dominates. The growth of internal layers at the curvature junctions have been studied. Measurements of the Górtler and corner vortex systems have been made. The boundary layer recovering from the sequence of concave to convex curvature has a sustained lower skin friction level than in that recovering from the sequence of convex to concave curvature. The amplification and suppression of turbulence due to the curvature sequences have also been studied.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 246 , January 1993 , pp. 503 - 527
Copyright
© 1993 Cambridge University Press

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