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Viscous tilting and production of vorticity in homogeneous turbulence

Holzner, M. and Guala, M. and Lüthi, B. and Liberzon, A. and Nikitin, N. and Kinzelbach, W. and Tsinober, A. (2010) Viscous tilting and production of vorticity in homogeneous turbulence. Physics of Fluids, 22 (6). Art. No. 061701 . ISSN 1070-6631.

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Viscous depletion of vorticity is an essential and well known property of turbulent flows, balancing, in the mean, the net vorticity production associated with the vortex stretching mechanism. In this letter, we, however, demonstrate that viscous effects are not restricted to a mere destruction process, but play a more complex role in vorticity dynamics that is as important as vortex stretching. Based on the results from three dimensional particle tracking velocimetry experiments and direct numerical simulation of homogeneous and quasi-isotropic turbulence, we show that the viscous term in the vorticity equation can also locally induce production of vorticity and changes of the orientation of the vorticity vector (viscous tilting).

Item Type:Article
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Additional Information:© 2010 American Institute of Physics. Received 9 February 2010; accepted 9 May 2010; published online 8 June 2010.
Subject Keywords:flow simulation, flow visualisation, turbulence, vortices
Issue or Number:6
Classification Code:PACS: 47.32.-y; 47.80.Jk; 47.11.-j; 47.27.-i
Record Number:CaltechAUTHORS:20100809-120628745
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:19341
Deposited By: Tony Diaz
Deposited On:09 Aug 2010 20:59
Last Modified:03 Oct 2019 01:55

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