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An analysis of the vortex street generated in a viscous fluid

Published online by Cambridge University Press:  28 March 2006

John W. Schaefer  and
Salamon Eskinazi
John W. Schaefer
Affiliation:
Syracuse University, Syracuse, New York
Salamon Eskinazi
Affiliation:
Syracuse University, Syracuse, New York
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Abstract

An analytic solution for the velocity field of a vortex street generated in a viscous fluid is developed. A method is presented for the determination of the true transverse spacing of vortices. Experimental geometry and velocity data, obtained by hot-wire techniques, are presented.

The experimental results verified the validity of the analytic solution. The vortices of a real viscous vortex street were found to resemble very closely the exponential solution of the Navier-Stokes equations for an isolated axisymmetric rectilinear vortex. Three basic regions of vortex street behaviour were apparent at each Reynolds number investigated-a ‘formation region’ in which the vortex street is developed and large dissipation of vorticity occurs, a ‘stable region’ in which the vortices display a stable periodic laminar regularity, and an ‘unstable region’ in which the street disappears and turbulence develops. Geometry and velocities were determined.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 6 , Issue 2 , August 1959 , pp. 241 - 260
Copyright
© 1959 Cambridge University Press

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