Wind tunnel measurement of three-dimensional turbulent flow structures around a building group: Impact of high-rise buildings on pedestrian wind environment
Wind tunnel measurement of three-dimensional turbulent flow structures around a building group: Impact of high-rise buildings on pedestrian wind environment
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建筑群周围三维湍流结构的风洞测量：高层建筑对行人风环境的影响
DOI：
10.1016/j.buildenv.2021.108389
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发表时间：
2021-10-01
影响因子：
7.4
通讯作者：
Shirzadi, Mohammadreza
中科院分区：
文献类型：
--
作者：
Tominaga, Yoshihide;Shirzadi, Mohammadreza
采用风洞法测量了以低层建筑为中心，高层建筑为中心的一组城市街区模型的风速和地表压力。不仅研究了时间平均速度场，还研究了湍流统计，即湍流动能、雷诺应力法向分量、阵风因子（GF）、瞬时速度分量的概率密度函数（PDF）和功率谱密度（PSD）。在此基础上，讨论了高层建筑对总体流结构和周围行人风环境的影响。高层建筑的存在极大地改变了建筑周围的行人风环境的时间平均和瞬时流动特性，这是由于建筑周围和周围街道峡谷内部及其上方的流动之间复杂的相互作用。高层建筑创造了一个大的GF区域，在这里下冲流和街道流发生碰撞。无论中心建筑物的高度如何，GF与时间平均水平速度量级之间都存在明显的相关性。高层建筑周围瞬时速度分量的PDF不仅在高层建筑的建筑角附近，而且在周围街道上都具有较大的倾斜特征。高层建筑产生较大的速度波动分量的psd，特别是在迎风角附近的高频和周围街道的中频。此外，时间平均和瞬时流动特性的结果为计算流体动力学（CFD）验证和模型开发研究提供了有用的数据库。
The wind velocity and surface pressure of the model of a group of urban blocks made of low-rise buildings with a high-rise building in the center were measured using a wind tunnel. Not only the time-averaged velocity field, but also the turbulent statistics, i.e., the turbulent kinetic energy, normal component of the Reynolds stresses, gust factor (GF), and probability density function (PDF), and power spectrum density (PSD) of instantaneous velocity components were investigated. Based on the results, the impact of high-rise buildings on the general flow structure and the surrounding pedestrian wind environment was discussed. The presence of high-rise buildings drastically changes the pedestrian wind environment around buildings in terms of time-averaged and instantaneous flow properties due to the complex interaction between the flows around the building and in and above the surrounding street canyons. High-rise buildings create a large GF region where the downwash flow and the street flow collide. A clear correlation between the GF and the time-averaged horizontal velocity magnitude was observed regardless of the height of the central building. The PDF of instantaneous velocity components around the high-rise building was characterized by a large skew not only near the building corners of the high-rise building but also on the surrounding streets. The high-rise building produces large PSDs of the velocity fluctuation components, particularly near the upwind corner at a high frequency and on the surrounding street at an intermediate frequency. Furthermore, the results of the time-averaged and instantaneous flow properties provide a useful database for computational fluid dynamics (CFD) validation and model development studies.