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Time-resolved volumetric measurement of fine-scale coherent structures in turbulence.

Worth, NA and Nickels, TB (2011) Time-resolved volumetric measurement of fine-scale coherent structures in turbulence. Phys Rev E Stat Nonlin Soft Matter Phys, 84. 025301-.

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Abstract

We present full volumetric (three-dimensional) time-resolved (+one-dimensional) measurements of the velocity field in a large water mixing tank, allowing us to assess spatial and temporal rotational energy (enstrophy) and turbulent energy dissipation intermittency. In agreement with previous studies, highly intermittent behavior is observed, with intense coherent flow structures clustering in the periphery of larger vortices. However, further to previous work the full volumetric measurements allow us to separate out the effects of advection from other effects, elucidating not only their topology but also the evolution of these intense events, through the local balance of stretching and diffusion. These findings contribute toward a better understanding of the intermittency phenomenon, which should pave the way for more accurate models of the small-scale motions based on an understanding of the underlying flow physics.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div A > Fluid Mechanics
Div A > Energy
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:56
Last Modified: 06 Oct 2014 01:21
DOI:

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