迎面会车二维气动仿真模拟研究

Head Crossing Two-dimensional Aerodynamic Simulation for Automobiles

应用计算流体力学(CFD)中的动网格技术,模拟由于流域边界运动引起的模型运动状态随某一变量变化的流动情况,结合新版公路工程建设标准,对在一级公路和三级公路上的迎面会车过程进行瞬态气动特性仿真研究,根据仿真结果分析速度和间距对汽车稳定性的影响.结果表明:不同间距、不同速度的会车侧向力呈现不稳定波动的变化曲线,并伴有极值出现,侧向力负向最大值出现在两车头平齐时,正向最大值出现在两车身平行时.此仿真结论与在道路行驶过程中的真实会车情况相吻合,可为道路建设和行车安全提供参考.

Based on the dynamic grid technology in computational fluid dynamics（CFD）,and taking into consideration the new highway engineering construction standards,the movement of automobiles on the primary and tertiary roads was simulated and the changes of their movement caused by certain variables were studied,and then the influence of speed and spacing on the stability of the vehicle was analyzed.The results show that the lateral force of the crossing vehicles of different spacing and speed exhibits a fluctuating curve of instability accompanied by extreme values.The maximum negative value of the lateral force appears when the heads of the two automobiles are parallel,while the maximum positive value appears when the bodies of the two vehides are parallel.The simulation results are consistent with the reality in traffic.Terefore,it can provide some reference for road construction and traffic safety.