轿车客车隧道中会车过程的瞬态CFD仿真

Transient aerodynamic computational simulation on vehicles crossing each other in tunnel

应用大型商业CFD软件对轿车和大客车隧道中会车过程的瞬态空气动力学特性进行研究.使用STAR-CD软件的滑动交界面和动网格技术模拟瞬态的轿车和大客车隧道会车过程,分析在此过程中可产生的瞬态连续定性的汽车与空气相互作用规律,分别得到会车过程中轿车和大客车随时间变化的空气动力学参数,找到轿车和大客车空气动力学参数随时间变化的趋势和规律,为进一步进行空气动力学瞬态问题试验和研究汽车操纵稳定性提供参考数据.仿真结果证明轿车和大客车会车过程中气动力产生很大变化,会对车辆的行驶性能产生重大影响.

The transient flow field around a saloon car and a coach when they passed each other was simulated using CFD software. The process that saloon car and coach passed each other in tunnel was simulated using the sliding interface and moving mesh technology provided by STAR-CD. The transient aerodynamic characteristics of simple shape （a saloon car and a coach） were analyzed to find the aerodynamic interactional rules about the car body and coach when they passed each other. The change trends of aerodynamic coefficients with time were obtained, which provides some data reference for further study about automotive stability and controlling capability as well as wind tunnel transient test. The simulation results indicate that the aerodynamic force is changed markedly when ear and coach passing each other in tunnel, which will affect the controlling capability of vehicles in this case.