Aerodynamic Load Characteristics of High-Speed Train under Different Wind Load Models

Abstract

In order to study the difference of unsteady aerodynamic loads of high-speed train under different wind load models, considering the assumption of uniform wind and the random characteristics of wind, the turbulent velocity field is generated by CDRFG method. A numerical model of cross-wind aerodynamics for high-speed trains was established by using STAR-CCM+, and solved by the IDDES method. The time history curve of fluctuating wind was transported into the computational domain as a function to calculate the computational fluid dynamics directly. The variation law and difference of aerodynamic load of high-speed train under two kinds of wind load models are obtained. With the increase of yaw angle, the maximum, average and standard deviation of aerodynamic load coefficient increase, and the coefficient fluctuation becomes more intense. The aerodynamic performance of the head car is the worst among the three cars. The PSD of aerodynamic load under stochastic wind is higher than that under uniform wind. With the increase of yaw angle, the corresponding PSD difference of aerodynamic load between stochastic wind and uniform wind increases, which indicates that the effect of pulsation is more obvious.