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Convective instability in inhomogeneous media : impulse response in the subcritical cylinder wake
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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. doi:10.1063/1.3531724 ISSN 10706631.
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Official URL: http://dx.doi.org/10.1063/1.3531724
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, Engineering and Medicine > Science > Mathematics | ||||
| Journal or Publication Title: | Physics of Fluids | ||||
| Publisher: | American Institute of Physics | ||||
| ISSN: | 10706631 | ||||
| Official Date: | January 2011 | ||||
| Dates: |
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| Volume: | Vol.23 | ||||
| Number: | No.1 | ||||
| Page Range: | Article no. 014104 | ||||
| DOI: | 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) |
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