Based on 3- D, unsteady compressible Navier-Stokes equations and SST k-ω two-equation IDDES turbulence model, the effect of cross passage on aerodynamic characteristics of evacuated tube transportation is simulated by overset mesh technology. The flow structure, aerodynamic force and aerothermal environment in three train/tube configurations are studied. The results show that there is a linear relationship between the length of the disturbed region of normal shock wave and running time. Cross passage can reduce both aerodynamic drag and aerothermal environment in the case of a single train passing. The transport channel and diffusion channel are formed to transport the air from tube A (B) to tube B (A). However, the lateral force fluctuates greatly. After the train leaves the cross passage, the lateral force coefficient periodically decays and oscillates. While, in the case of two train crossing, the existence of the cross passage could aggravate pressure field and aerothermal environment in the tube. Besides, the aerodynamic drag coefficient fluctuates during the intersection of two trains and the lateral force coefficient of the train fluctuates greatly and the maximum lateral force coefficient of two trains crossing is 2.86 times that of a single train passing.

基于3-D非定常可压缩Navier-Stokes方程和SST k - ω在两方程式IDDES湍流模型中，采用过冲网格技术模拟了交叉通道对真空管输送空气动力学特性的影响。研究了三种列车/管道结构的流动结构，空气动力和空气热环境。结果表明，正常冲击波受扰区域的长度与运行时间之间存在线性关系。在单列火车通过的情况下，交叉通道可以减少空气阻力和空气热环境。形成输送通道和扩散通道以将空气从管A（B）输送到管B（A）。但是，侧向力波动很大。列车离开交叉通道后，横向力系数会定期衰减和振荡。而如果是两列火车的穿越，交叉通道的存在会加剧管内的压力场和空气热环境。此外，在两列火车相交时，空气阻力系数会发生波动，火车的侧向力系数也会发生很大波动，两列火车相交的最大侧向力系数是单列火车通过时的2.86倍。