doi: 10.3850/S201042861100016X

Numerical Analysis of Unsteady Aerodynamics for
High-Speed Trains

Liu Jiangtao^1,2,a, Lu Jingjing¹, Chen Gang^1,b and Li Yueming^{1 1}State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Areospace, Xi’an Jiaotong University, Xi’an, China, 710049. ^aliujiangtao_tt621@126.com ^baachengang@mail.xjtu.edu.cn ²China Aerodynamics Research and Development Center, Mianyang City, China, 621000

ABSTRACT

The transient behavior of the unsteady flow is very important for structure design of new type of high-speed trains. Different turbulent models and motion realization methods were investigated thoroughly for the simulation of unsteady flow around the trains passing by each other. Two-dimensional and three-dimensional models were simulated. The large eddy simulation (LES) for two-dimensional case indicates that LES can give better results, however the computational cost is too expensive for three-dimensional model. For the simulation of three-dimensional train pass-by event, sliding mesh method is more adaptive and robust than dynamic mesh method. The simulation results of the three-dimensional CRH3 model were compared with experimental data. The results show that the numerical method based on RANS equation with k – ε model and sliding mesh method provides a good tool for high-speed train design.

Keywords: High-speed train, Train pass-by event, Unsteady aerodynamics, Numerical simulation.

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