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Experimental investigation of flow behind a cube for moderate Reynolds numbers

Published online by Cambridge University Press:  30 May 2014

L. Klotz ,
S. Goujon-Durand ,
J. Rokicki  and
J. E. Wesfreid
L. Klotz
Affiliation:
Physique et Mécanique des Milieux Hétérogènes - PMMH - (UMR 7636, ESPCI - CNRS - UPMC - UPD) Paris 75005, France Institute of Aeronautics and Applied Mechanics, Warsaw University of Technology, Nowowiejska 24, 00-665 Warsaw, Poland
S. Goujon-Durand
Affiliation:
Physique et Mécanique des Milieux Hétérogènes - PMMH - (UMR 7636, ESPCI - CNRS - UPMC - UPD) Paris 75005, France
J. Rokicki
Affiliation:
Institute of Aeronautics and Applied Mechanics, Warsaw University of Technology, Nowowiejska 24, 00-665 Warsaw, Poland
J. E. Wesfreid*
Affiliation:
Physique et Mécanique des Milieux Hétérogènes - PMMH - (UMR 7636, ESPCI - CNRS - UPMC - UPD) Paris 75005, France
*
†Email address for correspondence: wesfreid@pmmh.espci.fr
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Abstract

The wake behind a cube with a face normal to the flow was investigated experimentally in a water tunnel using laser induced fluorescence (LIF) visualisation and particle image velocimetry (PIV) techniques. Measurements were carried out for moderate Reynolds numbers between 100 and 400 and in this range a sequence of two flow bifurcations was confirmed. Values for both onsets were determined in the framework of Landau’s instability model. The measured longitudinal vorticity was separated into three components corresponding to each of the identified regimes. It was shown that the vorticity associated with a basic flow regime originates from corners of the bluff body, in contrast to the two other contributions which are related to instability effects. The present experimental results are compared with numerical simulation carried out earlier by Saha (Phys. Fluids, vol. 16, 2004, pp. 1630–1646).

JFM classification

Vortex Flows: Vortex Flows Vortex Flows: Vortex shedding Wakes/Jets: Wakes
Type
Papers
Information
Journal of Fluid Mechanics , Volume 750 , 10 July 2014 , pp. 73 - 98
Copyright
© 2014 Cambridge University Press 

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