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On the wake-induced vibration of tandem circular cylinders: the vortex interaction excitation mechanism

Published online by Cambridge University Press:  16 August 2010

G. R. S. ASSI ,
P. W. BEARMAN  and
J. R. MENEGHINI
G. R. S. ASSI*
Affiliation:
Department of Aeronautics, Imperial College, London SW7 2AZ, UK
P. W. BEARMAN
Affiliation:
Department of Aeronautics, Imperial College, London SW7 2AZ, UK
J. R. MENEGHINI
Affiliation:
Department of Mechanical Engineering, NDF, POLI, University of São Paulo, São Paulo, 05508-900, Brazil
*
†Present address: Department of Naval Architecture and Ocean Engineering, NDF, POLI, University of São Paulo, Av. Prof Mello Moraes 2231, 05508-900, São Paulo SP, Brazil. Email address for correspondence: g.assi@usp.br
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Abstract

The mechanism of wake-induced vibrations (WIV) of a pair of cylinders in a tandem arrangement is investigated by experiments. A typical WIV response is characterized by a build-up of amplitude persisting to high reduced velocities; this is different from a typical vortex-induced vibration (VIV) response, which occurs in a limited resonance range. We suggest that WIV of the downstream cylinder is excited by the unsteady vortex–structure interactions between the body and the upstream wake. Coherent vortices interfering with the downstream cylinder induce fluctuations in the fluid force that are not synchronized with the motion. A favourable phase lag between the displacement and the fluid force guarantees that a positive energy transfer from the flow to the structure sustains the oscillations. If the unsteady vortices are removed from the wake of the upstream body then WIV will not be excited. An experiment performed in a steady shear flow turned out to be central to the understanding of the origin of the fluid forces acting on the downstream cylinder.

JFM classification

Vortex Flows: Vortex Flows Wakes/Jets: Wakes/Jets
Type
Papers
Information
Journal of Fluid Mechanics , Volume 661 , 25 October 2010 , pp. 365 - 401
Copyright
Copyright © Cambridge University Press 2010

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