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Effect of turbulence modelling on the computation of the near-wake flow of a circular cylinder |
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| Authors: | Ug?ur Oral Ünal Mehmet Atlar Ömer Gören |
| Institution: | a Istanbul Technical University, Faculty of Naval Architecture and Ocean Engineering, Istanbul, Turkey b Newcastle University, School of Marine Science and Technology, Newcastle upon Tyne, UK c Istanbul Technical University, Faculty of Naval Architecture and Ocean Engineering, Istanbul, Turkey |
| Abstract: | An evaluation of four well-known Reynolds-Averaged Navier-Stokes (RANS)-based turbulence models was performed in comparison with the results of a dedicated experimental measurement on the near-wake of a circular cylinder in a large water (cavitation) tunnel using a state-of-the-art two-dimensional Digital Particle Image Velocimetry (DPIV) device.The turbulence models investigated were Spalart-Allmaras (S-A), Realizable k-ε (RKE), Wilcox k-ω (WKO) and Shear-Stress-Transport k-ω (SST), which were assessed based on their comparative performances in predicting some important flow field characteristics of the near-wake region of the experimental circular cylinder flow. Within the flow range investigated in this study, which implied a cylinder diameter-based Reynolds Number of 41,300, the qualitative and quantitative comparisons revealed that the application of the SST model to the wall-bounded unsteady flow - that experienced severe adverse pressure gradient, massive flow separation and vortex shedding - presents more successful predictions compared to other models investigated for such challenging flow conditions. |
| Keywords: | RANS Turbulence modelling Circular cylinder Near-wake flow |
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