On the effects of nonequilibrium on the subgrid-scale stresses
On the effects of nonequilibrium on the subgrid-scale stresses
An a priori study of the subgrid-scale (SGS) stresses and dissipation in two nonequilibrium, wall-bounded flows is carried out. The velocity fields were computed by direct simulations of two- and three-dimensional boundary layers obtained, respectively, by a sudden change in the Reynolds number and by an impulsive motion in the spanwise direction of the lower wall of a plane channel in fully developed turbulent flow conditions. Several realizations of the transient period of the flow were examined. The SGS stresses react to the imposition of the secondary shear more rapidly than the large-scale ones, and return to equilibrium before the resolved stresses do. In general, the subgrid scales are less sensitive than the large ones to the near-wall and nonequilibrium effects. Scale-similar and dynamic models appear well-suited to reproduce the correlation between resolved Reynolds stress production and events with significant production of SGS energy
2740-2748
Piomelli, U.
f42cc594-6f1b-4730-b774-15963c4de0da
Coleman, G.N.
ea3639b9-c533-40d7-9edc-3c61246b06e0
Kim, J.
611401fb-38dd-4c8a-a240-d8b21ca969a6
September 1997
Piomelli, U.
f42cc594-6f1b-4730-b774-15963c4de0da
Coleman, G.N.
ea3639b9-c533-40d7-9edc-3c61246b06e0
Kim, J.
611401fb-38dd-4c8a-a240-d8b21ca969a6
Piomelli, U., Coleman, G.N. and Kim, J.
(1997)
On the effects of nonequilibrium on the subgrid-scale stresses.
Physics of Fluids, 9, .
(doi:10.1063/1.869385).
Abstract
An a priori study of the subgrid-scale (SGS) stresses and dissipation in two nonequilibrium, wall-bounded flows is carried out. The velocity fields were computed by direct simulations of two- and three-dimensional boundary layers obtained, respectively, by a sudden change in the Reynolds number and by an impulsive motion in the spanwise direction of the lower wall of a plane channel in fully developed turbulent flow conditions. Several realizations of the transient period of the flow were examined. The SGS stresses react to the imposition of the secondary shear more rapidly than the large-scale ones, and return to equilibrium before the resolved stresses do. In general, the subgrid scales are less sensitive than the large ones to the near-wall and nonequilibrium effects. Scale-similar and dynamic models appear well-suited to reproduce the correlation between resolved Reynolds stress production and events with significant production of SGS energy
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Published date: September 1997
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Local EPrints ID: 71968
URI: http://eprints.soton.ac.uk/id/eprint/71968
ISSN: 1070-6631
PURE UUID: f8273cc0-5b2a-4ca3-b73a-eb0b77675a71
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Date deposited: 13 Jan 2010
Last modified: 13 Mar 2024 20:54
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Author:
U. Piomelli
Author:
G.N. Coleman
Author:
J. Kim
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