Near-wall turbulence structures in three-dimensional boundary layers
Near-wall turbulence structures in three-dimensional boundary layers
We examine the structure of near-wall turbulence in three-dimensional boundary layers (3DBLs), which we approximate by applying an impulsive spanwise motion to the lower wall of a turbulent channel flow.
Direct numerical simulation (DNS) data are analysed using probability density functions (PDFs), conditional-averaged quadrant analysis about Reynolds-stress-producing events, and visualization of vortices with the ?2-criterion. The evidence suggests that mean three-dimensionality breaks up the symmetry and alignment of near-wall structures, disrupting their self-sustaining mechanisms, and thereby causing a reduction in the turbulence kinetic energy (TKE).
480-488
Le, Anh-Tuan
233e1ea7-5815-4bdb-a143-60a1f5998345
Coleman, Gary N.
ea3639b9-c533-40d7-9edc-3c61246b06e0
Kim, John
6ef2ee34-636c-4183-b129-d3a45f9839fc
2000
Le, Anh-Tuan
233e1ea7-5815-4bdb-a143-60a1f5998345
Coleman, Gary N.
ea3639b9-c533-40d7-9edc-3c61246b06e0
Kim, John
6ef2ee34-636c-4183-b129-d3a45f9839fc
Le, Anh-Tuan, Coleman, Gary N. and Kim, John
(2000)
Near-wall turbulence structures in three-dimensional boundary layers.
International Journal of Heat and Fluid Flow, 21 (5), .
(doi:10.1016/S0142-727X(00)00035-7).
Abstract
We examine the structure of near-wall turbulence in three-dimensional boundary layers (3DBLs), which we approximate by applying an impulsive spanwise motion to the lower wall of a turbulent channel flow.
Direct numerical simulation (DNS) data are analysed using probability density functions (PDFs), conditional-averaged quadrant analysis about Reynolds-stress-producing events, and visualization of vortices with the ?2-criterion. The evidence suggests that mean three-dimensionality breaks up the symmetry and alignment of near-wall structures, disrupting their self-sustaining mechanisms, and thereby causing a reduction in the turbulence kinetic energy (TKE).
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Published date: 2000
Identifiers
Local EPrints ID: 21325
URI: http://eprints.soton.ac.uk/id/eprint/21325
ISSN: 0142-727X
PURE UUID: 905a9b77-57f3-4d86-9b7a-f3c151b74dd7
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Date deposited: 19 Jul 2006
Last modified: 15 Mar 2024 06:29
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Author:
Anh-Tuan Le
Author:
Gary N. Coleman
Author:
John Kim
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