Flow structure and wind pressure distribution caused by obtuse obstacles are usually the focuses in Computational Wind Engineer researches (CWE). By solving the non-hydrostatical dynamic equations, PUMA model (Peking University Model of Atmospheric Environment) was developed and applied to simulating the flow structure and wind pressure distribution around a tower-shaped building. Evaluation about the wind environment and wind loads around the building was obtained through the analysis of the numerical simulation results and wind tunnel data. Comparisons between the simulation and wind tunnel study indicate that numerical simulation results agree well in the flow field and wind pressure distribution around the tower-shaped building. On the other hand, the horizontal grid interval of 2 m and the vertical grid of 3 m were still too crude to simulate the flow structure and wind pressure distribution on the building surface more exactly in detail; and the absence of suitable pressure perturbation parameterization scheme between the solid and the adjacent space also limits the accuracy of the numerical simulation. The numerical simulation model can be used to evaluate the wind environment and wind load around high buildings.
利用自主开发的模拟建筑物周围风环境数值模式"北京大学大气环境模式"(Peking University Model of Atmospheric Environment,PUMA),通过求解非静力动力学方程,模拟了一个特殊塔型结构建筑物周围的空间流场以及建筑物表面风压系数的分布特征,同时与风洞实验的数据进行了对比,对该拟建项目可能导致的风环境问题以及建筑表面风荷载进行了评估.模拟结果与实验数据的比较显示,两者在速度场与建筑表面风压系数具有较好的吻合度,体现了该模式在风场以及压力场计算方面的良好性能.但通过与实验结果的对比不难发现,模式的结果在某些情况下与试验存在较大的误差.造成这种偏差的原因,一方面是模式现有的分辨率为水平方向2m,垂直方向3m,难以将塔型结构建筑物表面的气压变化完全精确的展现出来;另一方面,固壁面上格点的气压和周边空间气压分布之间关系的参数化方案,仍需要进一步改进.从整体来看,该模式模拟结果与风洞实验基本吻合,可以较好计算特殊形状钝体结构建筑物导致的风场以及风压分布情况.研究表明该数值模式可用以评估建筑物的表面风压及周围的风环境,在建筑物的风工程项目中具有良好的应用前景.
