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This research presents the predictions of flow past a rotating cylinder at a subcritical Reynolds number of 130,000. The main objective is to identify turbulence effective modelling strategies for unsteady RANS computations. For this reason both effectiveviscosity and stress-transport models have been used with different strategies for the modelling of near-wall turbulence which include standard log-law-based, and more refined wall functions, the latter based on the analytical solution of 1-D equations for the transport of wall-parallel momentum. The models' effectiveness is assessed through comparisons with available experimental and Large Eddy Simulation (LES) data. It is important that these present studies are in a good agreement with those obtained by the decreasing drag coefficient and increasing lift coefficient when a spin ratios ( : proportional tangential velocity of the cylinder wall to inlet flow velocity) of a cylinder grow up. Moreover, the stability of the flow domain is well improved with the suppressed vortex shedding, as well. Significantly, the prediction of the position of stagnation and separation flow position correspond to the magnitude of lift, drag coefficient and the rotation direction. Overall, this research has confirmed that the RSMs is capable to examine the external flow and more sensitized on the curvature surface flow.

The Reynolds Stresses Equation Modelling in the Prediction of Flow Past a Rotating Cylinder at High Reynolds Number