中文摘要：

利用计算流体动力学（CFD）软件对三维街谷模型进行数值模拟,采用附加源项法模拟植物的多孔介质特性,对街谷中种植树木前后的流场变化进行分析,并且从街谷中风速分布变化、街区理想风速比例及建筑周围平均风速3个方面进行评价.结果表明：在两种典型风向下,街谷中的风速在种植树木后均有不同程度的降低,不合理极端风速得到一定改善,可以认为植物对降低风速、稳定流场、改善行人区舒适性有一定的意义;同时从降低建筑物周围风速、减少墙面对流换热的角度而言,种植树木对降低建筑能耗也有一定意义.

英文摘要：

Based on the CFD（computational fluid dynamics）method, using additional source term, 3D numerical calculation was used to simulate air flow in street canyon to study the influence of plants in the street canyon. The flow field of street with plants was analyzed and evaluated on three aspects, including wind speed in street, the ideal wind velocity distribution performance index and the average wind speed around the buildings. The results indicate that street with plants can reduce wind speed and improve pedestrian comfort in different wind directions cases. And from the perspective of reducing the wind speed around the buildings and convective heat transfer of the wall, planting trees is significant for reducing building energy consumption in the winter.