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Multiple helical modes of vortex breakdown

Published online by Cambridge University Press:  19 August 2011

J. N. Sørensen ,
I. V. Naumov  and
V. L. Okulov
J. N. Sørensen*
Affiliation:
Department of Mechanical Engineering and Center for Fluid Dynamics, Technical University of Denmark, Nils Koppels Allé, 403, DK-2800 Lyngby, Denmark
I. V. Naumov
Affiliation:
Institute of Thermophysics, SB RAS and Novosibirsk State University, 630090, Novosibirsk, Russia
V. L. Okulov
Affiliation:
Department of Mechanical Engineering and Center for Fluid Dynamics, Technical University of Denmark, Nils Koppels Allé, 403, DK-2800 Lyngby, Denmark
*
†Email address for correspondence: jns@mek.dtu.dk
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Abstract

Experimental observations of vortex breakdown in a rotating lid-driven cavity are presented. The results show that vortex breakdown for cavities with high aspect ratios is associated with the appearance of stable helical vortex multiplets. By using results from stability theory generalizing Kelvin’s problem on vortex polygon stability, and systematically exploring the cavity flow, we succeeded in identifying two new stable vortex breakdown states consisting of triple and quadruple helical multiplets.

JFM classification

Vortex Flows: Vortex breakdown Vortex Flows: Vortex instability
Type
Papers
Information
Journal of Fluid Mechanics , Volume 683 , 25 September 2011 , pp. 430 - 441
Copyright
Copyright © Cambridge University Press 2011

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