Aerodynamic performance and dynamic response of high-speed trains passing by each other on cable-stayed bridge under crosswind

Abstract

High-speed trains (HSTs) passing by each other on cable-stayed bridges (CSBs) generated aerodynamic forces that significantly reduced the operational safety and stability of the trains. This study conducted a systematic analysis of the process through the co-simulation of Computational Fluid Dynamics (CFD) and Multi-Body Dynamics (MBD). First, a CFD model was established to analyze the flow field and aerodynamic forces of HSTs passing by each other on the CSB, based on the overset grid technology. Then, a finite element model for the CSB-track was established to obtain the deformation of the rail under winds. Finally, the MBD model was established and the time series of aerodynamic forces were applied to the HSTs, allowing for the analysis of the dynamic response. The results were as follows: when HSTs passed by each other on the CSB, there was a noticeable alteration in the distribution of air pressure on trains. The aerodynamic force variations of each vehicle on the windward side were greater than those on the leeward side. The safety and stability of each vehicle were decreasing, with the head vehicles having the lowest safety. As the crosswind speed increased, the dynamic response of trains was significantly heightened.