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Flow past short circular cylinders with two free ends

Published online by Cambridge University Press:  26 April 2006

M. M. Zdravkovich ,
V. P. Brand ,
G. Mathew  and
A. Weston
M. M. Zdravkovich
Affiliation:
Department of Aeronautical and Mechanical Engineering, University of Salford, Salford M5 4WT, UK
V. P. Brand
Affiliation:
Department of Aeronautical and Mechanical Engineering, University of Salford, Salford M5 4WT, UK
G. Mathew
Affiliation:
Department of Aeronautical and Mechanical Engineering, University of Salford, Salford M5 4WT, UK Present address: Arthur Andersen & Co., The Information Consultancy, Chicago, Illinois, USA.
A. Weston
Affiliation:
Department of Aeronautical and Mechanical Engineering, University of Salford, Salford M5 4WT, UK
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Abstract

Preliminary tests have been carried out on short circular cylinders with both ends free. Drag force is measured across the range 6 × 104 < Re < 2.6 × 105 for cylinders of length to diameter ratio L/D between 1 and 10. The effect of hemispherical ends is also investigated. A kind of periodic vortex shedding is found in the range 2 < L/D < 8. The oil-film surface flow visualization shows that the ‘eyes’ near the free ends (regions of low pressure) gradually disappear as L/D is reduced to 3. An asymmetric flow pattern is established for very short cylinders (L/D < 3). The detailed measurements of pressure distribution along and across models shows asymmetries of minimum and base pressures along the span. The asymmetric flow produces yawing and rolling moments which are also measured.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 203 , June 1989 , pp. 557 - 575
Copyright
© 1989 Cambridge University Press

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