To investigate the applicability of various turbulence models in simulating the aerodynamic characteristics of high-speed train pantographs under different operating environments,based on the theoretical foundations and computational fluid dynamics simulation methodologies of three turbulence models:k-ε,SST k-ω and Spalart-Allmaras,a comparative analysis was conducted on the accuracy and computational efficiency of these models in open and tunnel environments after the simulation results were verified through line tests.The results revealed that at the speed of 300 km·h-1,the variance between SST k-ω and k-ε models in calculating aerodynamic lift forces in open environments were 0.7％and 1.5％for closed and open configurations,respectively.The calculation variance between SST k-ω and Spalart-Allmaras models were 7.1％and 5.5％,respectively.SST k-ω and k-ε models predicted uniformly in the boundary layer,whereas the Spalart-Allmaras model exhibited lower prediction accuracy in boundary layer separation zones.In tunnel environments,the Spalart-Allmaras model outperformed the k-e model in terms of accuracy.Regarding computational efficiency,the Spalart-Allmaras model showed advantages in iteration count and convergence speed over the SST k-ω model.The applicability analysis indicated that the k-ε model excelled in both accuracy and computational efficiency in open environments,making it more suitable,whereas the Spalart-Allmaras model offered higher accuracy and calculation efficiency in tunnel environments,proving more applicable.The SST k-ω model is deemed more suitable for scenarios demanding high accuracy,where computational efficiency can be compromised.
维普
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