中文摘要：

在与相关实验研究结果进行比对的基础上，利用数值模拟的方法描述了中庭空间的流场分布和中庭内环境空气中的粒子浓度分布。结果表明，气溶胶粒子浓度的空间分布将受到中庭内部顺时针局部气流涡旋的影响；粒径和背景风速亦影响粒子浓度的分布，并低于背景浓度值．因此，中庭建筑结构可以有效地降低开放式空间内的粒子浓度．

英文摘要：

The flow field features and the dispersion characteristics of aerosol particles in a courtyard are simulated by employing a computational fluid dynamic （CFD） code when compared with the experimental data in the pervious literature obtained from the wind-tunnel study. The numerical results indicate that the spatial distribution of aerosols is influenced by a local clockwise vortex in the courtyard, and the particle size and ambient air velocities outside the courtyard can also affect the distribution of aerosols, and the concentrations in the internal space are lower than that of the ambient ones. It means that the courtyard configuration of buildings may reduce aerosol concentration levels in such semi-opening spaces.