Abstract
New lightweight material has been applied in the vehicle manufacture of the raised speed and high speed train. In order to strength the intensity of the vehicle, some stiffeners were designed on the vehicle top. In strong cross wind, stiffeners would change the flow field distribution of the vehicle top. Phenomenon of the flow separation would occur on the part of area. In order to study the aerodynamics effected by stiffeners in cross wind, the aerodynamics performance of the 300km/h high-speed vehicle have been calculated by FLUENT when there were stiffeners on the vehicle top or not. Result obtained shows that in cross wind, the side force and the overturning moment of the vehicle with stiffeners will increase; it is greater than those of the vehicle without stiffeners. The increase values are 52.94% and 39.49%. And the lift force of the vehicle with stiffeners has some drops.
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