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Flow past a cylinder close to a free surface

Published online by Cambridge University Press:  10 January 1997

J. SHERIDAN ,
J.-C. LIN  and
D. ROCKWELL
J. SHERIDAN
Affiliation:
Department of Mechanical Engineering and Mechanics, 354 Packard Laboratory, 19 Memorial Drive West, Lehigh University, Bethleham, 18015, USA
J.-C. LIN
Affiliation:
Department of Mechanical Engineering and Mechanics, 354 Packard Laboratory, 19 Memorial Drive West, Lehigh University, Bethleham, 18015, USA
D. ROCKWELL
Affiliation:
Department of Mechanical Engineering and Mechanics, 354 Packard Laboratory, 19 Memorial Drive West, Lehigh University, Bethleham, 18015, USA
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Abstract

Flow past a cylinder beneath a free surface gives rise to fundamental classes of nearwake structure that are distinctly different from the wake of a completely submerged cylinder. A central feature is the generation of a vorticity layer from the free surface due to: localized separation, in the form of small-scale breaking of a free-surface wave; or complete separation from the free surface. This vorticity layer appears adjacent to a layer from the surface of the cylinder, thereby forming a jet-like flow. It is shown that the instantaneous vorticity flux on either side of this jet is rapidly balanced immediately after the onset of separation from the free surface.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 330 , 10 January 1997 , pp. 1 - 30
Copyright
© 1997 Cambridge University Press

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