深凹露天矿流场与污染物散布的模拟研究

利用高阶矩湍流闭合方案建立了一个三维非静力高分辨率ＰＢＬ数值模式，并用此模式模拟了中性层结条件下一个深凹露天矿区实际地形的流场结构与湍流特性，分析并揭示露天矿自然通风特性，为进一步研究露天矿污染扩散规律提供背景流场。数值模拟的一些结果与同样试验条件下的风洞试验结果吻合甚好。

SIMULATION STUDY ON THE FLOW FIELD AND AIR POLLUTANT DISPERSION IN DEEP OPEN PIT

A 3-D non-hydrostatic higher-order turbulence closure PBL numerical model with higherresolution was developed. The mean flow and turbulence structure in a deep open-pit under neutral condition were investigated numerically. Results showed that there is a circulation in the deep open-pit. The direction of flow interesting levels is contrary to that at upstream. The most interesting feature of turbulence structure is that the Reynolds Stress, turbulence energy and turbulence intensity in the open-pit. The distribution of turbulence energy is homoeneous in the open-pit. The features of mean flow and turbulence structure depend on the slope of open-pit, wind speed of upstream and iwnd shear. Results obtained from the model has been compared with the date from the wind tunnel simulations and it was accordant reasonably.