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Numerical evaluation of wind-induced dispersion of pollutants around buildings.

机译：风在建筑物周围污染物扩散引起的数值评估。

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A detailed and comprehensive numerical study of wind-induced pollutant dispersion around buildings has been carried out. Research in this area was reviewed and analyzed. The results from various studies were compared. Based on the review and the comparison with various studies, a more effective methodology for the numerical evaluation of dispersion of pollutants around buildings has been proposed.; Computed results of a two-layer approach show various degrees of improvement for the concentration field in the wake region and on the back wall of the building. Results from two-layer approach also show improvement on the building roof for along-wind direction. However, the two-layer approach does not seem to work well for roof concentration along the cross-wind direction; this is probably due to the drawback of the isotropic turbulence model used.; The previous numerical studies on pollutant dispersion around rectangular buildings only investigated the concentration profiles for along-wind direction or vertical direction, and these were only for limited situations. A systematic examination of pollutant concentration in the wake of a rectangular building has been carried out for two different release sources. The concentration profiles have been investigated for along-wind, across-wind and vertical directions for various locations. The numerical simulation results have been compared with those from the experiments and from the Modified Gaussian Model. Results from numerical simulation generally agree well with those from the experiments. It was found that the numerical simulation predicts ground level pollutant concentrations better than the Modified Gaussian Model in the near building wake area.; The influence of numerical errors on the computed results and the effects of thresholds in the demoralization and convergence process have been investigated for the first time in the area of numerical simulation of pollutant dispersion around buildings.
机译：已经对建筑物周围的风致污染物扩散进行了详细而全面的数值研究。对该领域的研究进行了回顾和分析。比较了各种研究的结果。在回顾和与各种研究进行比较的基础上，提出了一种更有效的数值方法来评估建筑物周围污染物的扩散。两层方法的计算结果表明，在尾流区域和建筑物后壁上的集中场都有不同程度的改善。两层方法的结果还显示，建筑物屋顶沿顺风方向有所改善。但是，对于沿侧风方向的屋顶集中，两层方法似乎效果不佳。这可能是由于使用了各向同性湍流模型的缺点。先前关于矩形建筑物周围污染物扩散的数值研究仅研究了沿风向或垂直方向的浓度分布，并且这些仅用于有限的情况。对于两种不同的排放源，已经对矩形建筑物后的污染物浓度进行了系统的检查。已经针对不同位置的顺风，横风和垂直方向研究了浓度分布。数值模拟结果已与实验结果和改进的高斯模型进行了比较。数值模拟的结果通常与实验结果一致。结果发现，数值模拟预测在建筑物近尾流区地面污染物浓度要比改进高斯模型好。在建筑物周围污染物扩散的数值模拟领域，首次研究了数值误差对计算结果的影响以及阈值在消减和收敛过程中的影响。

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