Keywords: high-speed train, crosswind, rain, wind load, rain load, numerical simulation.

A numerical procedure based on the discrete phase method (DPM) combined with an impact force model of raindrops is proposed for computing rain loads on a two-dimensional high-speed train model. The number of raindrops with various diameters are, firstly, computed based on the rainfall intensity, and the trajectories of all raindrops are obtained by the DPM. The total impact force is calculated by adding the impact force of each raindrop that impacts the model, based on the impact force model. As a demonstration of the problem, a two-dimensional model of the CRH1 high-speed train is simulated using the presented method, in which the crosswind speeds correspond to level 8~12 of the Beaufort wind scale, and the rainfall intensities vary from 100 to 300mm/h. The results show that when the rainfall intensity is kept fixed, both the rain induced cross force and overturning moment increase monotonically with increasing crosswind speed. However, the induced lift would rise first and then drop when the rainfall intensity is less than 150mm/h; and increase monotonically when the rainfall intensity is larger than 200mm/h. Moreover, the variations of all the induced cross force, lift, and overturning moment are proportional to the rainfall intensity when the crosswind speed is kept fixed. Finally, the maximum ratio of the rainfall to crosswind induced cross forces, lifts, and overturning moments are 18.2%, 1.54% and 10.9%, respectively. Based on the numerical results, the influences of the rainfall upon the cruise of high-speed trains should be taken into consideration under the rainfall and crosswind conditions studied here.

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