University of Surrey

Test tubes in the lab Research in the ATI Dance Research

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.

[img]
Preview
Text
jammy2014.pdf - ["content_typename_Accepted version (post-print)" not defined]
Available under License : See the attached licence file.

Download (506kB) | Preview
[img]
Preview
PDF (licence)
SRI_deposit_agreement.pdf
Available under License : See the attached licence file.

Download (33kB) | Preview

Abstract

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 :
AuthorsEmailORCID
Jammy, SPUNSPECIFIEDUNSPECIFIED
Hills, NUNSPECIFIEDUNSPECIFIED
Birch, DMUNSPECIFIEDUNSPECIFIED
Date : 1 May 2014
Identification Number : 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 : 09 Jun 2014 13:58
URI: http://epubs.surrey.ac.uk/id/eprint/805432

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year


Information about this web site

© The University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
+44 (0)1483 300800