The improved delayed detached eddy simulation (IDDES) was used to study the influence of the platoon configuration of trains on its aerodynamic performance. CFD simulations were validated against the wind tunnel test and different mesh refinement to further verify the flow field around the high-speed train. The platoon configuration mainly affects the aerodynamic forces of the tail car of the front train (car3) and the head car of the rear train (car4) through flow interference. The surface pressure distribution of the train and the time domain and frequency domain characteristics of the aerodynamic force under different spacing are analyzed, and the changing law of the aerodynamic force and the lateral stability of the trains are summarized. The boundary layer and slipstream of trains in platoon are also compared with those of single trains. Meanwhile, both the time-averaged and instantaneous near-wake structures are compared for different cases.

改进的延迟分离涡模拟（IDDES）被用来研究列车排结构对其空气动力性能的影响。针对风洞测试和不同的网格细化对CFD模拟进行了验证，以进一步验证高速列车周围的流场。排结构主要通过流动干扰影响前列火车（car3）的尾厢和后列火车（car4）的头厢的空气动力。分析了列车的表面压力分布，分析了不同间距下空气动力的时域和频域特性，总结了空气动力的变化规律和列车横向稳定性。还比较了单排列车的边界层和滑流。