某高层建筑群室外风环境数值模拟分析

Numerical Analysis of the Wind Environment Outdoor Around Some High Buildings

利用Stream数值模拟软件对某高层建筑群的室外风环境进行了模拟,并分析了冬季、夏季以及过渡季室外风环境的流场、速度分布场以及风压分布场对建筑的影响。结果表明,冬季建筑周围人行区距地1.5m高处最大的风速为3.97rr/s,最大风速放大系数为1.07,冬季迎风面建筑物前后压差最大压力为4.37Pa,建筑前后压差最大为2.78 Pa,其他方向建筑物前后压差均小于5Pa,不影响行人舒适要求。夏季、过渡季盛行风向平均风速条件下建筑前后压差分别为4.16Pa、6.56 Pa,室内可利用自然通风。

The wind environment outdoor of some high buildings is simulated using the Stream software. The influence of flow field, velocity field and wind pressure distribution in winter, summer and transition season on the building is analyzed. The result indicates that the wind velocity can be 3.97m/s in the pedestrian area around the building at the height of 1.5 meter in winter. And the amplification ratio of the maximum wind velocity is 1.07. The maximum pressure difference before and after the building in the windward in winter is 4.37Pa, and the pressure difference in other directions of the building is all less than 5.0Pa. All the parameters demonstrate that the comfort requirements of the pedestrian is not be affected in winter. The pressure difference before and after the building at the average wind velocity of prevailing winds is respectively 4.16Pa and 6.56Pa in summer and transition season and the natural ventilation can be used indoor.