球形建筑风荷载及风流场的数值模拟

采用数值模拟方法对一处于设计方案阶段的球形高层建筑的表面风压及周围风流场进行了计算分析,获得了该类建筑与典型钝体高层建筑所不同的风压分布特性及周围风流场特性,例如球面背风区下侧的对称涡漩脱落现象,背风区中心线附近的局部正压作用等。在对不同风向角下的风压分布规律进行分析的基础上,给出了建筑物在最不利风向角下的最不利截面上的风压系数分布曲线,为该建筑方案抗风性能的鉴定及最终方案的确定提供了依据。

NUMERICAL SIMULATION OF WIND LOADS AND WIND FLOW FIELD AROUND A SPHERICAL TALL BUILDING

Numerical simulation is performed to investigate the wind-induced pressures on the surface of and wind flow field around a spherical tall building,which is at the preliminary design phase.Particular wind-pressure and wind-velocity distribution features,which are different from those for typical blunt tall buildings are obtained,such as the symmetrical vortex shedding phenomenon in the leeward area of the sphere and the local positive pressure distribution on the centerline vicinity of the leeward area.Through analysis of the numerical results of wind pressure distributions in different wind directions,the wind-pressure coefficient curves on the most unfavorable sections for the most unfavorable wind directions are presented.The obtained results and variation curves demonstrate the feasibility of the current design scheme of the building.