Marais, C., Godoy-Diana, R., Barkley, Dwight and Wesfreid, J. E.. (2011) Convective instability in inhomogeneous media : impulse response in the subcritical cylinder wake. Physics of Fluids, Vol.23 (No.1). Article no. 014104. ISSN 10706631

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Abstract

We study experimentally the impulse response of a cylinder wake below the critical Reynolds number of the Benard-von Karman instability. In this subcritical regime, a localized inhomogeneous region of convective instability exists which causes initial perturbations to be transiently amplified. The aim of this work is to quantify the evolution resulting from this convective instability using two-dimensional particle image velocimetry in a hydrodynamic tunnel experiment. The velocity fields allow us to describe the evolution of wave packets in terms of two control parameters: the Reynolds number and the magnitude of the imposed perturbation. The temporal evolution of energy exhibits a transient algebraic growth at short times followed by an exponential decay. (c) 2011 American Institute of Physics. doi:10.1063/1.3531724]

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Mathematics
Journal or Publication Title:	Physics of Fluids
Publisher:	American Institute of Physics
ISSN:	10706631
Official Date:	January 2011
Dates:	Date Event January 2011 Published
Volume:	Vol.23
Number:	No.1
Page Range:	Article no. 014104
Identification Number:	10.1063/1.3531724
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Leverhulme Trust , Royal Society , French Research Agency
Grant number:	ANR-08-BLAN-0099 (French Research Agency)
URI:	http://wrap.warwick.ac.uk/id/eprint/41899

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