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Passive scalar tagging for the study of coherent structures in the plane mixing layer

Passive scalar tagging for the study of coherent structures in the plane mixing layer
Passive scalar tagging for the study of coherent structures in the plane mixing layer
Data obtained from the two-dimensional numerical simulation of a plane mixing layer have been used to study the feasibility of tagging one side of the flow by a passive scalar and using the instantaneous concentration of the scalar to detect the typical coherent events in the flow. The study has shown that this technique works quite satisfactorily and yields results similar to those obtained by using the instantaneous vorticity as a detection criterion. The contribution from the coherent events to the time-averaged turbulent momentum and scalar transport has been estimated. It is found that this contribution is of the same order as the time-mean transport during most of the dynamical evolution of the coherent structure. However, it may attain very large values for short periods of time in the neighborhood of pairing. The increase is particularly spectacular in the case of the Reynolds shear stress. While the present findings obtained from a two-dimensional simulation seem to support earlier results obtained from actual experiments, it is desirable to conduct additional studies with three-dimensional simulations when they become available
1070-6631
2034-2041
Ramaprian, B.R.
248222bc-6283-4464-8d5a-8aa2d173a2df
Sandham, N.D.
0024d8cd-c788-4811-a470-57934fbdcf97
Mungal, M.G.
fa05a937-c0ed-4f98-a5f6-a7c4aa358d2a
Reynolds, W.C.
88dbc442-722d-424c-ac5b-cbd69bd5dacc
Ramaprian, B.R.
248222bc-6283-4464-8d5a-8aa2d173a2df
Sandham, N.D.
0024d8cd-c788-4811-a470-57934fbdcf97
Mungal, M.G.
fa05a937-c0ed-4f98-a5f6-a7c4aa358d2a
Reynolds, W.C.
88dbc442-722d-424c-ac5b-cbd69bd5dacc

(1989) Passive scalar tagging for the study of coherent structures in the plane mixing layer. Physics of Fluids, 1 (12), 2034-2041.

Record type: Article

Abstract

Data obtained from the two-dimensional numerical simulation of a plane mixing layer have been used to study the feasibility of tagging one side of the flow by a passive scalar and using the instantaneous concentration of the scalar to detect the typical coherent events in the flow. The study has shown that this technique works quite satisfactorily and yields results similar to those obtained by using the instantaneous vorticity as a detection criterion. The contribution from the coherent events to the time-averaged turbulent momentum and scalar transport has been estimated. It is found that this contribution is of the same order as the time-mean transport during most of the dynamical evolution of the coherent structure. However, it may attain very large values for short periods of time in the neighborhood of pairing. The increase is particularly spectacular in the case of the Reynolds shear stress. While the present findings obtained from a two-dimensional simulation seem to support earlier results obtained from actual experiments, it is desirable to conduct additional studies with three-dimensional simulations when they become available

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Published date: 1989
Organisations: Engineering Sciences

Identifiers

Local EPrints ID: 72049
URI: http://eprints.soton.ac.uk/id/eprint/72049
ISSN: 1070-6631
PURE UUID: ffaf4423-16d1-4059-85bd-022996e53d7c
ORCID for N.D. Sandham: ORCID iD orcid.org/0000-0002-5107-0944

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Date deposited: 18 Jan 2010
Last modified: 06 Jun 2018 12:55

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Contributors

Author: B.R. Ramaprian
Author: N.D. Sandham ORCID iD
Author: M.G. Mungal
Author: W.C. Reynolds

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