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Investigating vortex streets behind real and virtual bluff bodies

This paper describes a laboratory experiment designed to study regular arrays of vortices occurring behind an object in a stream of fluid. This phenomenon is observed in industrial flows, flows in the ocean, and in the atmosphere. In the first part of the experiment we consider the flow behind a cir...

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Bibliographic Details
Published in:American journal of physics 2006-03, Vol.74 (3), p.236-240
Main Authors: Afanasyev, Y. D., Deacon, C. G.
Format: Article
Language:English
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Summary:This paper describes a laboratory experiment designed to study regular arrays of vortices occurring behind an object in a stream of fluid. This phenomenon is observed in industrial flows, flows in the ocean, and in the atmosphere. In the first part of the experiment we consider the flow behind a circular cylinder. In the second part of the experiment the effect of a body on the fluid is imitated by using an appropriate force field, with no real body present in the fluid. The force field (virtual body) is created by a permanent magnet located above the surface of water in combination with an electric current applied in the horizontal direction. The apparatus required for the experiment is inexpensive and easy to construct.
ISSN:0002-9505
1943-2909
DOI:10.1119/1.2173274