摘要
结合某塔楼群玻璃幕墙的风灾实例,进行了塔楼群玻璃幕墙碎粒飞掷物的运动轨迹预测,研究了4种不同风场条件对幕墙碎粒飞行轨迹的影响。首先,在对大涡模拟方法及参数设置的有效性验证的基础上,通过紊流边界层风场内塔楼群的非定常绕流大涡模拟,获取了建筑周围的三维非定常绕流场。然后,采用五阶龙格库塔法,求解粒状飞掷物的三维刚体运动方程,通过均匀流场下飞掷物轨迹计算方法与文献试验结果的对比,验证了本文方法的有效性。最后,对比分析了不同流场条件对颗粒的飞行轨迹及飞行速度的影响。结果表明,本文飞掷物运动轨迹计算方法结合大涡模拟获取的流场能够对飞掷物飞行轨迹进行有效预测;对同一位置释放的颗粒,与理想均匀流场相比,三维自由来流场中颗粒的飞行速度和飞行距离相对较低;三维自由来流场忽略湍流成分时,会使颗粒的飞行速度进一步降低,而飞行距离增大;对于塔楼群三维非定常绕流场,与理想均匀流和三维自由来流场的飞掷物轨迹预测的结果相差较大,且飞掷物的飞行轨迹受绕流场中不同初始位置的影响较大,并可能显著影响最终的评估结果。因此,飞掷物的飞行轨迹应充分考虑建筑群周围的三维非定常绕流场和初始破坏位置的影响。
Based on a case of wind induced damage to glass curtain wall of a tower building group,the motion trajectory of glass curtain wall debris is predicted,and the influence of four different wind field conditions on the flight trajectory of glass curtain wall debris are studied.Firstly,based on the validation of the large eddy simulation method and parameter setting,the unsteady flow field around the tall buildings is obtained through the large eddy simulation of the unsteady flow around the tower group in the turbulent boundary layer wind field.Then,the fifth-order Runge-Kutta method is used to solve the governing equations of three-dimensional rigid body motion,and the validity of the method is verified by comparing the trajectory calculation method of the debris in a uniform flow field with the experimental results in the literature.Finally,the influence of different flow field conditions on the flight path and velocity of particles are analyzed.The results show that the trajectory calculation method with large eddy simulation can predict the trajectory effectively.For the debris released from the same position,the predicted flight speed and flight distance of the debris in three-dimensional free flow field are relatively lower than those in an ideal uniform flow field.When the turbulent component is ignored in the three-dimensional free flow field,the flight speed of the debris is further reduced and the flight distance is increased.For the three-dimensional unsteady flow around the tower buildings,there is a large difference between the trajectory prediction for the ideal uniform flow and the three-dimensional free flow.Moreover,the trajectory of the debris is greatly affected by the different initial positions in the flow field,which may significantly affect the final evaluation results.Therefore,the three-dimensional unsteady flow around the buildings and the initial failure position should be fully considered in the prediction of trajectory of the debris.
作者
郑德乾
张香港
唐意
赵明伟
ZHENG Deqian;ZHANG Xianggang;TANG Yi;ZHAO Mingwei(School of Civil Engineering,Henan University of Technology,Zhengzhou 450001,China;China Academy of Building Research,Beijing 100013,China;School of Applied Science,Taiyuan University of Science and Technology,Taiyuan 030024,China)
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2024年第5期162-170,共9页
Journal of Harbin Institute of Technology
基金
国家自然科学基金(51408196)。
关键词
塔楼群
玻璃幕墙
颗粒飞掷物
飞行轨迹
大涡模拟
high-rise building groups
glass curtain wall
wind-borne debris
flying trajectory
large eddy simulation
