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Direct numerical simulation of a decelerated wall-bounded turbulent shear flow

Direct numerical simulation of a decelerated wall-bounded turbulent shear flow
Direct numerical simulation of a decelerated wall-bounded turbulent shear flow
A fully developed turbulent channel flow is subjected to a mean strain that approximates that in a spatially developing adverse-pressure-gradient (APG) boundary layer. This is done by applying uniform irrotational temporal deformations to the flow domain of a conventional direct numerical simulation channel code. The velocity difference between the inner and outer layer is also controlled by accelerating the walls in the streamwise plane, in order to duplicate the defining features of both the inner and outer regions of an APG boundary layer. Eventually, the flow reverses at the wall. We address basic physics and modelling issues, and create a database that makes detailed testing of turbulence models easy. As in the corresponding spatial layers, distinct inner- and outer-layer dynamics are observed: a decrease in turbulence intensity near the wall is accompanied by increased energy in the outer layer. The ‘extra strain’ effect associated with the diverging outer-layer streamlines is documented, particularly in the Reynolds-stress budgets.
0022-1120
1-18
Coleman, G.N.
ea3639b9-c533-40d7-9edc-3c61246b06e0
Kim, J.
611401fb-38dd-4c8a-a240-d8b21ca969a6
Spalart, P.R.
b90f3552-3126-4a78-b0e6-5153151433ef
Coleman, G.N.
ea3639b9-c533-40d7-9edc-3c61246b06e0
Kim, J.
611401fb-38dd-4c8a-a240-d8b21ca969a6
Spalart, P.R.
b90f3552-3126-4a78-b0e6-5153151433ef

Coleman, G.N., Kim, J. and Spalart, P.R. (2003) Direct numerical simulation of a decelerated wall-bounded turbulent shear flow. Journal of Fluid Mechanics, 495, 1-18. (doi:10.1017/S0022112003005883).

Record type: Article

Abstract

A fully developed turbulent channel flow is subjected to a mean strain that approximates that in a spatially developing adverse-pressure-gradient (APG) boundary layer. This is done by applying uniform irrotational temporal deformations to the flow domain of a conventional direct numerical simulation channel code. The velocity difference between the inner and outer layer is also controlled by accelerating the walls in the streamwise plane, in order to duplicate the defining features of both the inner and outer regions of an APG boundary layer. Eventually, the flow reverses at the wall. We address basic physics and modelling issues, and create a database that makes detailed testing of turbulence models easy. As in the corresponding spatial layers, distinct inner- and outer-layer dynamics are observed: a decrease in turbulence intensity near the wall is accompanied by increased energy in the outer layer. The ‘extra strain’ effect associated with the diverging outer-layer streamlines is documented, particularly in the Reynolds-stress budgets.

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Published date: 2003

Identifiers

Local EPrints ID: 22544
URI: http://eprints.soton.ac.uk/id/eprint/22544
ISSN: 0022-1120
PURE UUID: 46b11536-5aa3-402d-a219-b1e2db4ebed4

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Date deposited: 22 Mar 2006
Last modified: 08 Jan 2022 06:49

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Contributors

Author: G.N. Coleman
Author: J. Kim
Author: P.R. Spalart

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