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Three-dimensional separated flow structure over a cylinder with a hemispherical cap

Published online by Cambridge University Press:  26 April 2006

T. Hsieh  and
K. C. Wang
T. Hsieh
Affiliation:
Information Sciences and Systems Branch, Naval Surface Warfare Center, Silver Spring, MD 20903, USA
K. C. Wang
Affiliation:
Aerospace Engineering and Engineering Mechanics, San Diego State University, San Diego, CA 92182, USA
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Abstract

Thin-layer Navier–Stokes solutions are obtained for an incompressible laminar flow over a hemisphere–cylinder at 10°, 30° and 50° incidence to exhibit some three-dimensional separated flow characteristics. Some of the results are compared with a previous water-tunnel investigation for the same body geometry. Good agreement is found, even for some detailed features. Although the geometry is relatively simple, the separated flow surprisingly embraces a number of intricate structural characteristics unique to three-dimensional flows. Particularly noteworthy are the separation sequence at increasing incidence, tornado-like vortices, outward-spiralling vortices, limit cycles, coaxial counter-spiralling patterns and horseshoe vortex systems. Physical insights to these new features are offered.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 324 , 10 October 1996 , pp. 83 - 108
Copyright
© 1996 Cambridge University Press

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