中文摘要：

运用修正的k—ε双方程湍流模型分别对非对称性建筑物和对称性建筑物周围的流场和污染物浓度场进行模拟，计算出地面风速为3m／s时不同建筑物周围的流场与污染物浓度场分布。结果表明：建筑物的形状对建筑物周围风场和污染物浓度场有明显的影响，不同形状建筑物尾流区形态各不相同。数值模拟结果对研究建筑物周围的传输特性有一定的指导意义，并对污染物的扩散机理进行了探讨。

英文摘要：

Based on the modified k-ε turbulence model, airflow field and pollutant concentration field around dissymmetry and symmetry buildings were simulated. Airflow field and pollutant concentration field around the different buildings were calculated when the wind speed reaches 3 m/s. The results indicate that the building shapes can influence obviously wind field and pollutant concentration field around the buildings. The characteristics of wake regions are different for the different building shapes. The numerical simulation results are significant to research the transfer characteristics around buildings. Finally, the diffusion mechanisms of pollutants are also discussed.