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New oscillatory instability of a confined cylinder in a flow below the vortex shedding threshold

Published online by Cambridge University Press:  24 November 2011

B. Semin*
Affiliation:
Laboratoire FAST, Université Paris-Sud, Université Pierre et Marie Curie–Paris 6, CNRS, Bat. 502, Campus Univ., Orsay, F-91405, France
A. Decoene
Affiliation:
Department of Mathematics, Université Paris-Sud, Bat. 452, Campus Univ., Orsay, F-91405, France
J.-P. Hulin
Affiliation:
Laboratoire FAST, Université Paris-Sud, Université Pierre et Marie Curie–Paris 6, CNRS, Bat. 502, Campus Univ., Orsay, F-91405, France
M. L. M. François
Affiliation:
Laboratoire FAST, Université Paris-Sud, Université Pierre et Marie Curie–Paris 6, CNRS, Bat. 502, Campus Univ., Orsay, F-91405, France
H. Auradou
Affiliation:
Laboratoire FAST, Université Paris-Sud, Université Pierre et Marie Curie–Paris 6, CNRS, Bat. 502, Campus Univ., Orsay, F-91405, France
*
Email address for correspondence: semin@fast.u-psud.fr

Abstract

A new type of flow-induced oscillation is reported for a tethered cylinder confined inside a Hele-Shaw cell (ratio of cylinder diameter to cell aperture, ) with its main axis perpendicular to the flow. This instability is studied numerically and experimentally as a function of the Reynolds number and of the density of the cylinder. This confinement-induced vibration (CIV) occurs above a critical Reynolds number much lower than for Bénard–Von Kármán vortex shedding behind a fixed cylinder in the same configuration (). For low values, CIV persists up to the highest value investigated (). For denser cylinders, these oscillations end abruptly above a second value of larger than and vortex-induced vibrations (VIV) of lower amplitude appear for . Close to the first threshold , the oscillation amplitude variation as and the lack of hysteresis demonstrate that the process is a supercritical Hopf bifurcation. Using forced oscillations, the transverse position of the cylinder is shown to satisfy a Van der Pol equation. The physical meaning of the stiffness, amplification and total mass coefficients of this equation are discussed from the variations of the pressure field.

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Papers
Copyright
Copyright © Cambridge University Press 2011

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New oscillatory instability of a confined cylinder in a flow below the vortex shedding threshold
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