Simulation and modelling of a skewed turbulent channel flow
Simulation and modelling of a skewed turbulent channel flow
A time-dependent three-dimensionally skewed flow is investigated using direct numerical simulations of the incompressible Navier–Stokes equations. The effect on the instantaneous and mean turbulent field is investigated. Instantaneous flowfields reveal that the skewing has the effect of initially reducing the strength and height of quasi-streamwise vortices of both signs of rotation with respect to the skewing. A mechanism for this process is put forward. The mean flowfields show drops in turbulence quantities such as turbulence kinetic energy. In addition to this, two-equation turbulence modelling of the flow is carried out. This highlights a deficiency, in that the standard turbulence models are unable to capture the drop in turbulence intensity due to the skewing. A modification based on the exact dissipation equation is found to significantly improve the model behaviour for this flow.
83-109
Howard, R.J.A.
00df2480-b821-4d0a-8f20-c485ea816f6d
Sandham, N.D.
0024d8cd-c788-4811-a470-57934fbdcf97
2000
Howard, R.J.A.
00df2480-b821-4d0a-8f20-c485ea816f6d
Sandham, N.D.
0024d8cd-c788-4811-a470-57934fbdcf97
Howard, R.J.A. and Sandham, N.D.
(2000)
Simulation and modelling of a skewed turbulent channel flow.
Flow Turbulence and Combustion, 65 (1), .
(doi:10.1023/A:1009963827954).
Abstract
A time-dependent three-dimensionally skewed flow is investigated using direct numerical simulations of the incompressible Navier–Stokes equations. The effect on the instantaneous and mean turbulent field is investigated. Instantaneous flowfields reveal that the skewing has the effect of initially reducing the strength and height of quasi-streamwise vortices of both signs of rotation with respect to the skewing. A mechanism for this process is put forward. The mean flowfields show drops in turbulence quantities such as turbulence kinetic energy. In addition to this, two-equation turbulence modelling of the flow is carried out. This highlights a deficiency, in that the standard turbulence models are unable to capture the drop in turbulence intensity due to the skewing. A modification based on the exact dissipation equation is found to significantly improve the model behaviour for this flow.
This record has no associated files available for download.
More information
Published date: 2000
Organisations:
Engineering Sciences
Identifiers
Local EPrints ID: 32800
URI: http://eprints.soton.ac.uk/id/eprint/32800
ISSN: 1386-6184
PURE UUID: 9af763b5-8bde-435e-9fec-9c4a568b4768
Catalogue record
Date deposited: 12 May 2006
Last modified: 16 Mar 2024 03:03
Export record
Altmetrics
Contributors
Author:
R.J.A. Howard
Author:
N.D. Sandham
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics