基于“Spalart-Allmaras”湍流模型的高速公路大型车车头间距

Headway of Large Scale Vehicles on Freeway Based on “Spalart-Allmaras” Turbulence Model

为了解决高速公路排水产生的安全问题,以交通工程学、水力学等理论为基础,通过分析高速公路大型车的运行特性,采用GAMBIT构建了模拟路面排水形式的仿真模型,并运用FLUENT软件中的"Spalart-Allmaras"湍流模型进行模拟分析,得到高速公路单辆车、高密车流出口压力变化规律和压力云图.结果表明:在降雨强度为0. 05～0. 50 mm/min的情况下,不形成连续移动水坝现象的临界车头间距为20～100 m,高速公路安全行车的临界运行速度为86 km/h至29 km/h.

To solve the safety problem caused by highway drainage,based on the theories of traffic engineering and hydraulics,by analyzing the running characteristics of large scale vehicles on freeway,a simulation model of road surface drainage was constructed by using GAMBIT.The'Spalart-Allmaras'turbulence model in FLUENT software was used to simulate and analyze the safety problem.The variation law of the pressure at the outlet of the single and high density vehicle and the pressure cloud chart were obtained.Results show that the critical headway spacing is 20-100 m and the critical speed of expressway safe operation is from 86 km/h to 29 km/h without continuous moving dam under rainfall intensity of 0.05-0.50 mm/min.