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On the inversion of the von Kármán street in the wake of a confined square cylinder

Published online by Cambridge University Press:  15 February 2007

SIMONE CAMARRI  and
FLAVIO GIANNETTI
SIMONE CAMARRI
Affiliation:
Dipartimento di Ingegneria Aerospaziale, Università di Pisa, Italy
FLAVIO GIANNETTI
Affiliation:
Dipartimento di Ingegneria Meccanica, Università di Salerno, Italy
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Abstract

This paper considers the incompressible two-dimensional laminar flow around a square cylinder symmetrically positioned in a channel. In this type of flow, even if vortices of opposite sign are alternately shed from the body into the wake as in the unconfined case, an inversion of their position with respect to the flow symmetry line takes place further downstream. A numerical analysis is carried out to investigate the physical origin of this phenomenon and to characterize the position in the wake at which the vortices cross the symmetry line. It is shown that, for low to moderate blockage ratios, the fundamental cause of the inversion of the vortices is the amount of vorticity present in the incoming flow, and a dynamic interpretation in terms of vorticity interference in the wake is given. Further insight is gained through a linear stability analysis of the vortex shedding instability.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 574 , 10 March 2007 , pp. 169 - 178
Copyright
Copyright © Cambridge University Press 2007

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