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Evolution of vortex structures in a model of the turbulent trailing vortex

Faddy, J. M. and Pullin, D. I. (2006) Evolution of vortex structures in a model of the turbulent trailing vortex. In: IUTAM Symposium on Elementary Vortices and Coherent Structures : Significance in Turbulence Dynamics. Fluid mechanics and its applications. No.79. Springer , Dordrecht, pp. 259-264. ISBN 1-4020-4180-2.

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We present results obtained from a direct numerical simulation for a model of incompressible trailing vortices consisting of an array of counter-rotating vortices and a superposed axial velocity in a doubly-periodic domain, infinite in the vertical direction. The Reynolds number based on vortex circulation is 1000. It is found that for suffciently strong axial flow, helical instability modes develop on each vortex. This leads to a decrease in the magnitude of the axial flow and subsequent relaminarization of each vortex. At later times, modes corresponding to the more slowly growing co-operative instability become dominant. These produce their own helical structures followed by the rapid growth of small scales, then vorticity cancellation and decay of the vortex array. In the presence of strong axial flow the helical structure persists and the vortices appear more resistant to the breakdown phenomena than for arrays with no axial flow.

Item Type:Book Section
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Additional Information:© 2006 Springer.
Subject Keywords:trailing vortices; axial flow; M&M vortex
Series Name:Fluid mechanics and its applications
Issue or Number:79
Record Number:CaltechAUTHORS:20110322-102528073
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:23049
Deposited By: Tony Diaz
Deposited On:22 Mar 2011 21:36
Last Modified:09 Nov 2021 16:10

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