Simulation and Modelling of a Skewed Turbulent Channel Flow |
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Authors: | Richard JA Howard Neil D Sandham |
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Institution: | (1) Equipe MOST, LEGI, INP Grenoble, BP 53, 38041 Grenoble Cedex 9, France;(2) Aeronautics & Astronautics, School of Engineering Sciences, University of Southampton, Southampton, SO17 1BJ, U.K. |
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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 revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | skew flow DNS turbulence modelling |
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