A numerical study of laterally strained wall-bounded turbulence
A numerical study of laterally strained wall-bounded turbulence
Direct numerical simulation (DNS) is used to study the effects of mean lateral divergence and convergence on wall-bounded turbulence, by applying uniform irrotational temporal deformations to a plane-channel domain. This extends a series of studies of similar deformations. Fast and slow straining fields are considered, leading to a matrix of four cases, all corresponding to zero-pressure-gradient (ZPG) flows along the centreplane in ducts with constant rectangular cross-sectional area but varying aspect ratio. The results are used to address basic physical and modelling questions, and create a database that allows detailed yet straightforward testing of turbulence models. Initial tests of three representative one-point models reveal meaningful differences. The extra-strain effects introduced by the matrix of fast and slow divergence and convergence are documented, separating the direct effects of the strain from the indirect ones that alter the shear rate and change the distance from
the wall. Some findings are predictable, and none contradict experimental findings. Others require more thought, notably an asymmetry between the effect of convergence and divergence on the peak turbulence kinetic energy.
wall-bounded turbulence, direct numerical simulation, turbulence modelling
443-478
Coleman, G.N.
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Fedorov, D.
fbf3b402-05ea-4de9-b199-4d9c4c46de1f
Spalart, P.R.
b90f3552-3126-4a78-b0e6-5153151433ef
Kim, J.
611401fb-38dd-4c8a-a240-d8b21ca969a6
November 2009
Coleman, G.N.
ea3639b9-c533-40d7-9edc-3c61246b06e0
Fedorov, D.
fbf3b402-05ea-4de9-b199-4d9c4c46de1f
Spalart, P.R.
b90f3552-3126-4a78-b0e6-5153151433ef
Kim, J.
611401fb-38dd-4c8a-a240-d8b21ca969a6
Coleman, G.N., Fedorov, D., Spalart, P.R. and Kim, J.
(2009)
A numerical study of laterally strained wall-bounded turbulence.
Journal of Fluid Mechanics, 639, .
(doi:10.1017//S0022112009991042).
Abstract
Direct numerical simulation (DNS) is used to study the effects of mean lateral divergence and convergence on wall-bounded turbulence, by applying uniform irrotational temporal deformations to a plane-channel domain. This extends a series of studies of similar deformations. Fast and slow straining fields are considered, leading to a matrix of four cases, all corresponding to zero-pressure-gradient (ZPG) flows along the centreplane in ducts with constant rectangular cross-sectional area but varying aspect ratio. The results are used to address basic physical and modelling questions, and create a database that allows detailed yet straightforward testing of turbulence models. Initial tests of three representative one-point models reveal meaningful differences. The extra-strain effects introduced by the matrix of fast and slow divergence and convergence are documented, separating the direct effects of the strain from the indirect ones that alter the shear rate and change the distance from
the wall. Some findings are predictable, and none contradict experimental findings. Others require more thought, notably an asymmetry between the effect of convergence and divergence on the peak turbulence kinetic energy.
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Published date: November 2009
Keywords:
wall-bounded turbulence, direct numerical simulation, turbulence modelling
Organisations:
Aerodynamics & Flight Mechanics
Identifiers
Local EPrints ID: 71717
URI: http://eprints.soton.ac.uk/id/eprint/71717
ISSN: 0022-1120
PURE UUID: 13a85125-be23-4484-b29b-c33641f4980f
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Date deposited: 21 Dec 2009
Last modified: 13 Mar 2024 20:40
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Contributors
Author:
G.N. Coleman
Author:
D. Fedorov
Author:
P.R. Spalart
Author:
J. Kim
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