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Vortex shedding and lock-on of a circular cylinder in oscillatory flow

Published online by Cambridge University Press:  21 April 2006

C. Barbi ,
D. P. Favier ,
C. A. Maresca  and
D. P. Telionis
C. Barbi
Affiliation:
Institut de Mécanique des Fluides, UM34-C.N.R.S., Marseille, France
D. P. Favier
Affiliation:
Institut de Mécanique des Fluides, UM34-C.N.R.S., Marseille, France
C. A. Maresca
Affiliation:
Institut de Mécanique des Fluides, UM34-C.N.R.S., Marseille, France
D. P. Telionis
Affiliation:
Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA
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Abstract

An experimental study has been made of a circular cylinder in steady and oscillatory flow with non-zero mean velocity up to a Reynolds number of 40000. The results for the stationary cylinder are in close agreement with previously published data. Skin-friction measurements revealed the amplitude of fluctuation of the boundary layer for different angular locations. It has been universally accepted that bluff bodies shed vortices at their natural frequency of shedding (Strouhal frequency), or, when synchronized with an external unsteadiness, at the frequency of the disturbance or half of it, depending of the direction of the unsteadiness. Our findings, instead, indicate that the shedding frequency may vary smoothly with the driving frequency before locking on its subharmonic. Moreover, the present results indicate that, at the lowest frequency limit of lock-on, vortices are shed simultaneously on both sides of the model. A more traditional alternate pattern of vortex shedding is then recovered at higher driving frequencies.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 170 , September 1986 , pp. 527 - 544
Copyright
© 1986 Cambridge University Press

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