【摘要】 对高速列车在隧道中行驶时所引起的湍流场进行了数值模拟，计算了列车所受到的空气阻力。数值计算采用变密度、轴对称的ｋ～ε模型和ＰＩＳＯ算法，并将粗糙面速度分布公式和尼古拉兹公式引入壁函数法中，以反映壁面粗糙度的影响，提出了对不规则边界的速度修正法。针对不同的车速、阻塞比和车头细长比，分别进行了模拟，获得了全场的压力分布，以及空气阻力与基本参数的关系，并与传统的经典方法阻力计算结果进行了对比分析。更多还原

【Abstract】 The aerodynamic drag of train in tunnel is calculated on the basis of the mathematical model of turbulence. The axi symmetric k ε model and PISO method are employed. The roughnes of wall is taken into condsideration on the basis of the Nicurades formula and profile of velocity on a rough wall. The irregular boundary is treated by correcting the velocity near the wall. The calculation is achived under the different conditions. The relations between the aerodynamic drag and the different factors are analysed and compared with that obtained by the classical method.更多还原