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Boundary conditions and vortex wandering

Jammy, SP, Hills, N and Birch, DM (2014) Boundary conditions and vortex wandering Journal of Fluid Mechanics, 747. pp. 350-368.

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A direct numerical simulation of a Batchelor vortex has been carried out in the presence of freely-decaying turbulence, using both periodic and symmetric boundary conditions; the latter most closely approximates typical experimental conditions, while the former is often used in computational simulations for the purposes of numerical convenience. The higher-order velocity statistics were shown to be strongly dependent upon the boundary conditions, but the dependence could be mostly eliminated by correcting for the random, Gaussian modulation of the vortex trajectory commonly referred to as 'wandering' using a technique often employed in the analysis of experimental data. Once corrected for this wandering, the strong peaks in the Reynolds stresses normally observed at the vortex centre were replaced by smaller local extrema located within the core region but away from the centre. The distributions of the corrected Reynolds stresses suggested that the formation and organization of secondary structures within the core is the main mechanism in turbulent production during the linear growth phase of vortex development.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
Jammy, SP
Hills, N
Birch, DM
Date : 1 May 2014
DOI : 10.1017/jfm.2014.169
Additional Information : Copyright 2014 Cambridge University Press. Reprinted with permission.
Depositing User : Symplectic Elements
Date Deposited : 13 May 2014 09:33
Last Modified : 31 Oct 2017 16:42

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