Comparison of the Reynolds-averaged Turbulence Models on Single Phase Flow Simulation in Agitated Extraction Columns

摘要

The flow field of liquid phase (water) of agitated extraction columns is simulated with the help of computational fluid dynamics (CFD). Four kinds of Reynolds-averaged turbulence models, i.e. the standard κ-ε model, the RNG (renormalization group) κ-ε model, the realizable κ-ε model and the Reynolds stress model, are compared in detail in order to judge which is the best model in terms of the accuracy, less CPU time and memory required. The performance of the realizable κ-ε model is obviously improved by reducing the model constant from C_2 = 1.90 to C_2 = 1.61. It is concluded that the improved realizable κ-ε model is the optimal model.