为了合理评估轨道交通隧道环境内湍流场的特性, 以上海地铁1 号线的部分参数为设计背景, 采用美国Ansys 公司的商用计算流体力学(computational fluid dynamics, CFD) 软件包FLUENT 模拟了该环境下列车运行所引起的湍流场中的压强场和温度场. 对压强和温度分布图进行采样, 然后对采样数据进行分析, 并进一步将采样结果运用到该环境下无线电波折射率结构常数的求解中; 与已有实验所得经验值数据进行比较, 二者具有较好的一致性, 从而为该环境下电波折射率结构常数的求解提供了一种可靠的方法.
To evaluate the characteristics of turbulent flow in a rail transit tunnel environment, this paper simulates the turbulent flow field due to the fast moving trains in a subway tunnel. Using parameters obtained from Shanghai Metro Line 1, the distribution diagrams of pressure and temperature fields are obtained. In the simulation, a commercial software package for computational fluid dynamics (CFD), FLUENT, is used. A set of data from the distribution diagrams is selected to solve the refractive index structure parameters of radio wave under such environmental condition. The calculated results are compared with published experimental data, showing a good agreement. Therefore, the proposed method provides a useful solution to refractive index structure parameters of radio wave.
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