建筑物尾流区气流与污染物扩散的数值计算

Numerical simulation of flow fleld and dispersion in wake region of building

采用了细网格非静力能量闭合边界层模式和随机游动模拟方法建立了一套分析建筑物尾流流场和污染物扩散的数值模拟系统．作为应用研究的例子，在对某城市地下交通隧道排废气的风井塔尾流区流场和浓度场进行风洞流体物理实验的基础上，利用所建的模拟系统对风井塔尾流区气流和污染物扩散特征进行研究．结果表明，所建的模拟系统的模拟结果与风洞试验的结果吻合较好，对一些小尺度带有明显湍流不均匀性的流场和局地空气污染物散布的情况有较好的模拟效果和良好的应用前景．

A numerical model containing a 3 dimensional fine mesh non hydrostatic submode and a random walk submodel was developed and used for simulation of turbulence and dispersion in wake area of building. Based on measured flow field and concentration field behind the exhaust tower of one city in NJU meteorological wind tunnel, experiments were performed using the model. The results obtained from numerical modeling were in accordanc with those observed in the wind tunnel.