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Smoke observations of the wake of a group of three cylinders at low Reynolds number

Published online by Cambridge University Press:  28 March 2006

M. M. Zdravkovich
M. M. Zdravkovich
Affiliation:
Cambridge University Engineering Department
On leave from the Department of Mechanical Engineering, University of Belgrade.
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Abstract

A smoke visualization technique was used to study the laminar wake behind a group of three cylinders. The main characteristic of the interaction between the three cylinders was the appearance of strong sinuous oscillations some distance downstream in the wake, which led to the formation of a new single vortex street. The mechanism of the formation process of this vortex street and the part played in it by the sinuous oscillations is demonstrated by a series of photographs. The effects of variation of the spacing of the configuration have been examined in detail.

In an interaction between three fully developed vortex streets, some of the rows of vortices crossed, and there was an extremely complicated re-arrangement of vorticity in the wake.

Transition to turbulence in such wakes was also studied. The most interesting result observed was an asymmetric transition. Wakes were sometimes observed which were laminar on one side and turbulent on the other.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 32 , Issue 2 , 3 May 1968 , pp. 339 - 351
Copyright
© 1968 Cambridge University Press

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