Abstract
Aerodynamic analysis of trains with different longitudinal section lines under crosswind was studied using the CFD methods in this paper. The slopes of five different longitudinal section lines are 0.58, 0.54, 0.5, 0.46, 0.42, respectively. The results show that the drag coefficient increases 27.6% and the lift force increases 12.3% with the slope of longitudinal section line increases from 0.42 to 0.58, but the lateral force varies little. The drag coefficient and lift force increase logarithmically with the slope of longitudinal section lines. With the increase of the slope of longitudinal section line, the surface pressure coefficient of the windward side is basically unchanged, but the surface pressure coefficient of the leeward side is decreasing. Comparing the flow field around the train, it is found that the longitudinal section line has no obvious influence on the flow field structure of the lead car, the vortex of the leeward of the middle car and the tail car increases with the slope of longitudinal section line increases.
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