Given the complexity of the wind environment around bridge–tunnel sections in canyons, flow fields are complex and changeable, resulting in transient aerodynamic loads on vehicles. Consequently, vehicles tend to sideslip or drift off lanes, affecting handling stability. An aerodynamic model coupled with a two-degrees-of-freedom dynamic model is proposed to reveal the aerodynamic performance and dynamic response under canyon–bridge–tunnel condition. The terrain and geomorphology are constructed by extracting the contour map from the geographic information system to obtain a realistic scenario. A numerical simulation platform is established by using commercial solver Ansys Fluent and Matlab. The dynamic grid technology is used to simulate the process of a sedan passing through different positions. The changes in the aerodynamic performance of the sedan as it exits the tunnel and passes through the bridge tower area are revealed. Results show that topography has an important influence on aerodynamic characteristics, affecting trajectory and posture of vehicles.

考虑到峡谷中桥梁隧道部分周围风环境的复杂性，流场是复杂且多变的，从而导致车辆出现瞬态气动载荷。因此，车辆倾向于侧滑或偏离车道，从而影响操纵稳定性。提出了结合两自由度动力学模型的空气动力学模型，以揭示峡谷-桥梁-隧道条件下的空气动力学性能和动力响应。通过从地理信息系统中提取等高线图来构建地形和地貌，以获得真实的场景。使用商业求解器Ansys Fluent和Matlab建立了数值模拟平台。动态网格技术用于模拟轿车通过不同位置的过程。揭示了轿车离开隧道并通过桥塔区域时，其空气动力学性能的变化。结果表明，地形对空气动力学特性有重要影响，会影响车辆的轨迹和姿态。