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Simulation and Statistical Understanding of Turbulent Wind Flow Past a Prismatic Cylinder by Hybrid RANS/ LES models

Sarat Maharana, Amit G


The motivation to study the three-dimensional flows over bluff bodies has come from the wider scope of applications of the flow over building models, vehicles, any earth-fixed structures which are not stream-lined. Bluff bodies are widely available in engineering applications. There are still areas to comprehend in the flow physics of bluff bodies. In these cases the flow is typically turbulent and hence the complexity of the flow phenomenon is not easily explored until many attempts are made to establish the finding of a particular problem in this type of flow. These flows involve complex phenomena like separation and reattachment, unsteady vortex shedding and bimodal behaviour, high turbulence, large-scale turbulent structures as well as curved shear layers. There is a great need in practice to predict such flows and the loading imposed on the bodies, but this is a difficult task even for relatively simple geometries. An attempt has been made through numerical simulation to understand the turbulent flow behavior over a prismatic cylinder. The RANS/LES hybrid model has been used for the study. The turbulent flow features were extracted for both the cases and it was quite satisfactory to note that RANS/LES hybrid seems to be superior in terms of predicting the physics of flow. The mean velocity profiles obtained from using RANS, hybrid LES/RANS and experiments were drawn in the centerline of prismatic cylinder

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