2012. The Society of Naval Architects and Marine Engineers
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This paper presents results predicted by three different RANS models: k-epsilon RNG, k-omega SST and Reynolds Stress for uniform and oscillating flows around a circular cylinder. First the models are applied to a uniform inflow case at Re=2,000, and the predicted Strouhal number, drag and lift coefficients are compared with experimental measurements of a reference paper in order to validate the proposed methodology and to test the three turbulence models. The models are then applied to the case of oscillating flow at KC=9 and Re=2,000, and the effects of turbulence model and grid size on the results are investigated. Then, in the case of oscillating flow, the vortex patterns from the numerical simulations and from a flume test conducted in the Fluids & Hydraulics lab at UT Austin, are presented. The results predicted by the Reynolds Stress model using two different meshes are also compared. By changing the velocity magnitude of the oscillating inflow, the Reynolds Stress model is then applied to conduct a parametric study for a wide range of Reynolds and KC numbers. The in-line forces on the cylinder, predicted by the RANS model, in the case of oscillating flow, are finally compared with those from Morison equation, using the experimental determined values for the drag and inertial coefficients by Sarpkaya (1985).
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