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Comparison of turbulence models in simulating swirling pipe flows
Authors:Andrew Escue  Jie Cui
Institution:Mechanical Engineering Department, Tennessee Technological University, Box 5014, Cookeville, TN 38505, USA
Abstract:Swirling flow is a common phenomenon in engineering applications. A numerical study of the swirling flow inside a straight pipe was carried out in the present work with the aid of the commercial CFD code fluent. Two-dimensional simulations were performed, and two turbulence models were used, namely, the RNG kε model and the Reynolds stress model. Results at various swirl numbers were obtained and compared with available experimental data to determine if the numerical method is valid when modeling swirling flows. It has been shown that the RNG kε model is in better agreement with experimental velocity profiles for low swirl, while the Reynolds stress model becomes more appropriate as the swirl is increased. However, both turbulence models predict an unrealistic decay of the turbulence quantities for the flows considered here, indicating the inadequacy of such models in simulating developing pipe flows with swirl.
Keywords:Swirling flows  RNG k&ndash  ε model  RSM model  Numerical simulation  Turbulence models
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