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Vortex shedding frequency in open-channel lateral cavity

Published online by Cambridge University Press:  06 April 2020

C. Perrot-Minot*
Affiliation:
Univ Lyon, Ecole Centrale de Lyon, INSA Lyon, Universite Claude Bernard Lyon I, CNRS, Laboratoire de Mecanique des Fluides et d’Acoustique, UMR 5509, 36 Avenue Guy de Collongue, F-69134, Ecully, France
E. Mignot
Affiliation:
Univ Lyon, INSA Lyon, Ecole Centrale de Lyon, Universite Claude Bernard Lyon I, CNRS, LMFA, UMR 5509, 20 Avenue Albert Einstein, F-69621, Villeurbanne, France
R. Perkins
Affiliation:
Univ Lyon, Ecole Centrale de Lyon, INSA Lyon, Universite Claude Bernard Lyon I, CNRS, Laboratoire de Mecanique des Fluides et d’Acoustique, UMR 5509, 36 Avenue Guy de Collongue, F-69134, Ecully, France
D. Lopez
Affiliation:
Univ Lyon, INSA Lyon, Ecole Centrale de Lyon, Universite Claude Bernard Lyon I, CNRS, LMFA, UMR 5509, 20 Avenue Albert Einstein, F-69621, Villeurbanne, France
N. Riviere
Affiliation:
Univ Lyon, INSA Lyon, Ecole Centrale de Lyon, Universite Claude Bernard Lyon I, CNRS, LMFA, UMR 5509, 20 Avenue Albert Einstein, F-69621, Villeurbanne, France
*
Email address for correspondence: clement.perrot-minot@insa-lyon.fr

Abstract

This article aims at predicting the oscillation frequency of open-channel lateral cavities, which are common sheltered zones of riverine environments, and have important ecological impact. Using a theoretical analysis based on an existing model for acoustic cavities and a free-surface lateral cavity experiment, we show that the vortex shedding in the mixing layer between the cavity and the open channel is always constrained by gravity waves even for low Froude numbers ($F<0.6$). This expands previous results from the literature showing the impact of gravity waves on the vortex shedding frequency for high Froude number ($F>0.6$). Measurements of the free-surface oscillation and transverse velocity oscillation frequencies reveal a unique frequency along the mixing layer, equal to the free-surface oscillation frequency anywhere in the cavity. Hence, it is shown that the vortex shedding frequency in an open-channel lateral cavity always equals a match between a natural frequency of the cavity and a solution of the feedback model developed herein for low to moderate Froude numbers.

Type
JFM Papers
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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