Direct numerical simulation of axisymmetric wakes embedded in turbulence
Direct numerical simulation of axisymmetric wakes embedded in turbulence
Direct numerical simulation has been used to study the effects of external turbulence on axisymmetric wakes. In the absence of such turbulence, the time-developing axially homogeneous wake is found to have the self-similar properties expected whereas, in the absence of the wake, the turbulence fields had properties similar to Saffman-type turbulence. Merging of the two flows was undertaken for three different levels of external turbulence (relative to the wake strength) and it is shown that the presence of the external turbulence enhances the decay rate of the wake, with the new decay rates increasing with the relative strength of the initial external turbulence. The external turbulence is found to destroy any possibility of self-similarity within the developing wake, causing a significant transformation in the latter as it gradually evolves towards the former
482-504
Rind, Elad
b06dbedd-70cd-4476-acc5-a8cbcb029804
Castro, Ian P.
66e6330d-d93a-439a-a69b-e061e660de61
2012
Rind, Elad
b06dbedd-70cd-4476-acc5-a8cbcb029804
Castro, Ian P.
66e6330d-d93a-439a-a69b-e061e660de61
Rind, Elad and Castro, Ian P.
(2012)
Direct numerical simulation of axisymmetric wakes embedded in turbulence.
Journal of Fluid Mechanics, 710, .
(doi:10.1017/jfm.2012.374).
Abstract
Direct numerical simulation has been used to study the effects of external turbulence on axisymmetric wakes. In the absence of such turbulence, the time-developing axially homogeneous wake is found to have the self-similar properties expected whereas, in the absence of the wake, the turbulence fields had properties similar to Saffman-type turbulence. Merging of the two flows was undertaken for three different levels of external turbulence (relative to the wake strength) and it is shown that the presence of the external turbulence enhances the decay rate of the wake, with the new decay rates increasing with the relative strength of the initial external turbulence. The external turbulence is found to destroy any possibility of self-similarity within the developing wake, causing a significant transformation in the latter as it gradually evolves towards the former
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Published date: 2012
Organisations:
Engineering Science Unit
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Local EPrints ID: 342805
URI: http://eprints.soton.ac.uk/id/eprint/342805
ISSN: 0022-1120
PURE UUID: 594a22d0-431e-456f-8902-527ca315aebf
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Date deposited: 13 Sep 2012 13:59
Last modified: 14 Mar 2024 11:55
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Author:
Elad Rind
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