Details on the intermittent transition to turbulence of a locally forced plane Couette flow

G. Antar 1, * S. Bottin 2 Olivier Dauchot 2 François Daviaud 3, 2 Paul Manneville 4
* Auteur correspondant
1 University of California San Diego, Center for Energy Research, 9500 Gilman Drive, La Jolla, CA 92093-0417, United States
2 SPEC - UMR3680 - Service de physique de l'état condensé
3 SPHYNX - Systèmes Physiques Hors-équilibre, hYdrodynamique, éNergie et compleXes
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
4 LadHyX - Laboratoire d'hydrodynamique
Abstract : Experimental results are presented on the transition to turbulence of a plane Couette flow locally and permanently forced by a small bead. The intermittent aspect of this transition is investigated in a detailed analysis of the transition periods from coherent to turbulent and vice versa. A maximum number of transitions are achieved at a Reynolds number of about 310. It is shown that the breakdown of the flow coherence results from a complex succession of events occurring as follows. A secondary instability takes place leading to a drift of at least one vortex pair away from the excitation source. Consequently, the flow in the bead vicinity is laminar and a vortex pair is generated. Turbulence results from the interaction between the newly born vortex and the one already active. As the fluctuation intensity decreases all over the flow, the laminar state is recovered in the bead vicinity from which two vortex pairs are regenerated. The second main contribution of this paper is the study of the turbulent state using spatio-temporal correlation. The role of lateral streaks and their properties in the turbulent state are investigated. It is demonstrated that the turbulent spot is sustained by a vortex generation near the source followed by convection towards the boundaries. In both coherent and turbulent states, the flow near the bead is found to determine the plane Couette flow evolution.
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Article dans une revue
Experiments in Fluids, Springer Verlag (Germany), 2003, 34 (3), pp.324-331. 〈10.1007/s00348-002-0560-2〉
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Contributeur : Denis Roura <>
Soumis le : jeudi 17 juillet 2014 - 14:16:35
Dernière modification le : jeudi 10 mai 2018 - 02:02:32

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G. Antar, S. Bottin, Olivier Dauchot, François Daviaud, Paul Manneville. Details on the intermittent transition to turbulence of a locally forced plane Couette flow. Experiments in Fluids, Springer Verlag (Germany), 2003, 34 (3), pp.324-331. 〈10.1007/s00348-002-0560-2〉. 〈hal-01024931〉

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