Turbulent Flow Control Prediction Using LES and RSM Modeling


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Abstract


The common ability of the riblets or grooved surfaces to reduce turbulent skin friction has been well demonstrated over the latest years for numerous flow conditions.  In this paper, turbulent flow simulation was performed in periodic channel with longitudinal grooved wall.  Blade and V grooves are examined. The numerical approach was carried out by FLUENT code adopting both Large Eddy Simulation (LES) and Reynolds Stress Model (RSM).  The numerical study investigated in the case of low Reynolds number to ascertain riblets efficiency is given.  Drag reduction is found to be in good agreement with the available data.  Moreover, typical features related to the effects of grooved surface on the behavior of turbulent secondary motion are provided. It is shown that, LES and RSM can reproduce such phenomena over grooved wall. Furthermore, eddy viscosity variation is provided by comparison between smooth and grooved wall. However, the RSM is clearly superior for situations in which the anisotropy of turbulence has a dominant effect on the mean flow.
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Keywords


Grooved Surfaces; Large Eddy Simulation (LES); Riblets; Reynolds Stress Model (RSM)

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