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Unsteady behavior of a confined jet in a cavity at moderate Reynolds numbers

Bouchet, Gilles and Climent, Eric Unsteady behavior of a confined jet in a cavity at moderate Reynolds numbers. (2012) Fluid Dynamics Research, vol. 44 (n° 2). pp.1-11. ISSN 0169-5983

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Official URL: http://dx.doi.org/10.1088/0169-5983/44/2/025505

Abstract

Self-sustained oscillations in the sinuous mode are observed when a jet impinges on a rigid surface. Confined jet instability is experimentally and numerically investigated here at moderate Reynolds numbers. When the Reynolds number is varied, the dynamic response of the jet is unusual in comparison with that of similar configurations (hole-tone, jet edge, etc). Modal transitions are clearly detected when the Reynolds number is varied. However, these transitions result in a reduction of the frequency, which means that the wavelength grows with Reynolds number. Moreover, the instability that sets in at low Reynolds number, as a subcritical Hopf bifurcation, disappears only 25% above the threshold. Then, the flow becomes steady again and symmetric. This atypical behavior is compared with our previous study on a submerged fountain (Bouchet et al 2002 Europhys. Lett. 59 826).

Item Type:Article
Additional Information:Thanks to Institute of Physics editor . The definitive version is available at http://dx.doi.org/10.1088/0169-5983/44/2/025505
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Université de Provence - Aix-Marseille I (FRANCE)
Other partners > Université de la Méditerranée - Aix-Marseille II (FRANCE)
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Deposited By: Eric CLIMENT

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