高层建筑风场的数值模拟和风洞试验结果比较  

Comparison of Numerical Simulation Results with Wind Tunnel Data for Wind Field of High-rise Building

作　　者：张冬兵[1,2] 梁枢果[1] 陈寅[3] 邹垚[1] 

机构地区：[1]武汉大学土木建筑工程学院,武汉430072 [2]江西省交通科学研究院,南昌330038 [3]中南电力设计院,武汉430071

出　　处：《武汉理工大学学报》2011年第4期104-108,共5页Journal of Wuhan University of Technology

基　　金：国家自然科学基金重大研究计划(90715023)

摘　　要：以中华城商业社区高层建筑群为工程背景,采用RNGk-ε湍流模型模拟了建筑群中超高层建筑的表面平均风压分布及周围风环境,计算了与风洞试验等雷诺数及增大来流风速和模型尺寸提高雷诺数后的两类雷诺数工况,并同风洞试验结果进行了对比。结果表明,在等雷诺数情况下,风洞试验和数值模拟得到的超高层建筑表面风压分布较为一致,数值差别在15%以内;数值模拟与试验雷诺数相差25倍的工况中,当多数建筑主轴向与来流风速成一定角度时,超高层建筑的风压分布及周围流场的数值模拟结果与试验较一致;当多数建筑主轴向与来流风速平行时,尾流中旋涡分布的数值模拟结果与试验差异明显,但平均风压分布的数值模拟与试验结果略显差别。Distribution of the mean pressure and surrounding wind environment of high-rise buildings were simulated by using RNGk-ε turbulence model in a group of high-rise buildings named China City Business Community.Two cases were calculated,one was that the Re number was equal to Re number in wind tunnel test,the other was that Re number was about 25 times of Re number in wind tunnel test by increasing wind velocity and model size.The calculated results were compared with those of experiments,and the results showed that the calculated mean of distribution pressure of the high-rise building is almost consistent with the experimental mean when the Re number is equal to each other,and the differences between them are less than 15%.For the case that the numerical Re number is much greater than the experimental one,when there is an angle between the principal axes of majority buildings and the flow velocity,the calculated distribution of the mean pressure and surrounding wind environment of the high-rise buildings are similar with wind tunnel data;when the axes of buildings are parallel to the flow velocity,there are visible differences in vortex distribution and streamline of wake between numerical and experimental results,but the calculated distribution of the mean pressures of the high-rise building is has small difference from results.

关 键 词：高层建筑 风荷载 风洞试验 数值模拟 雷诺数 

分 类 号：TU312.1[建筑科学—结构工程] TU317.1