Effect of Crosswind Angle on the Surface Pressure Distribution of Intercity Trains on Viaducts Under Wind-Driven Rain Environment

The turbulence effect of the pulsating wind is worsened by the strong wind-driven rain environment, which intensifies its impact on the structure, making the aerodynamic safety problem of trains on viaducts under the combined effect of wind and rain more and more prominent. In this work, the impact of the crosswind angle on the surface pressure distribution of the intercity trains operating on viaducts under wind-driven rain scenarios is investigated by numerical simulation. The results show that the airflow surrounding the train caused some raindrops to exhibit a parabolic projectile motion along the surface of trains, with the parabolic projectile distance increasing as the crosswind angle increased, and the increasing tendency is also performed along the longitudinal direction of the train. Compared with the sole crosswind condition, the surface pressure coefficient of the train demonstrates an increasing trend in the rain condition, due to the impact effect of raindrops driven by the crosswind on the surface of intercity trains. In wind-driven rain conditions, the surface pressure coefficient of the train tends to increase as the crosswind angle increases in the crosswind angle range from 30° to 90°.