A Comparative Study of Different Turbulence Models in Computation of Flow Around Simplified Train

Abstract:

An evaluation of the most frequenytly used five turbulence models on the flow around a simplified train model is presented. Based on numerical simulation and test results, a conclusion can be drawn that the most accurate prediction for drag is achieved by Realizable k ε, the minimum error is 2.5%, while shear stress transport(SST) k w is more accurate for lift, 0.5% is the minimum error. In addition, quasi two dimensional separation captured by Standard k w and SST k w approximates oil flow visualization, however, the three dimension separation is more exactly captured by Realizable k ε Model.

Key words:turbulence model; wind tunnel test; flow around train; numerical simulation; oil flow visualization