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On vortex rings around vortices: an optimal mechanism

Published online by Cambridge University Press:  26 April 2007

ARNAUD ANTKOWIAK  and
PIERRE BRANCHER
ARNAUD ANTKOWIAK
Affiliation:
Institut de Mécanique des Fluides de Toulouse (IMFT), 2, Allée du Professeur Camille Soula, 31 400 Toulouse, France
PIERRE BRANCHER
Affiliation:
Institut de Mécanique des Fluides de Toulouse (IMFT), 2, Allée du Professeur Camille Soula, 31 400 Toulouse, France
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Abstract

Stable columnar vortices subject to hydrodynamic noise (e.g. turbulence) present recurrent behaviours, such as the systematic development of vortex rings at the periphery of the vortex core. This phenomenon lacks a comprehensive explanation, partly because it is not associated with an instability stricto sensu. The aim of the present paper is to identify the physical mechanism triggering this intrinsic feature of vortices using an optimal perturbation analysis as a tool of investigation. We find that the generation of vortex rings is linked to the intense and rapid amplification of specific disturbances in the form of azimuthal velocity streaks that eventually evolve into azimuthal vorticity rolls generated by the rotational part of the local Coriolis force. This evolution thus appears to follow a scenario opposite to the classical lift-up view, where rolls give rise to streaks.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 578 , 10 May 2007 , pp. 295 - 304
Copyright
Copyright © Cambridge University Press 2007

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