基于标准建筑群模型的行人高度风环境数值模拟研究  

Numerical simulation of pedestrian-level wind environment based on standard urban building model

作　　者：楚晨晖 孟亮[1,2] 朱瑶瑶 CHU Chenhui;MENG Liang;ZHU Yaoyao(Wuxi Environmental Science&Engineering Research Center,Wuxi 214100,China;School of Architecture and Environmental Engineering,Wuxi City College of Vocational Technology,Wuxi 214100,China)

机构地区：[1]无锡环境科学与工程研究中心,江苏无锡214100 [2]无锡城市职业技术学院建筑与环境工程学院,江苏无锡214100

出　　处：《武汉工程大学学报》2024年第6期699-705,共7页Journal of Wuhan Institute of Technology

基　　金：2021无锡城市职业技术学院“青蓝工程”项目(202138);2022无锡城市职业技术学院校级科研课题(WXCY-2022-KY-07)。

摘　　要：行人高度风环境是人居环境的重要考察指标。为研究建筑群的不同布局形式对行人高度(Z=1.5 m)风环境的影响,采用计算流体力学(CFD)技术对某标准建筑群模型进行了风环境数值模拟。首先,进行了网格无关性检验和模拟准确性检验,确定了可靠的网格方案和模拟条件。然后,通过数值模拟,得到并总结了标准建筑群模型的中心区域范围内的平均风速场、迹线场分布规律。接着改变建筑群模型的建筑密度、相对高度以及错落度等参数,研究不同条件因素对行人高度风环境的影响效应。研究结果表明:中心区域平均风速较来流风速有所增大,且存在若干旋涡区。在中心建筑前部、侧后方存在风速极值区域。中心区域平均风速对建筑密度的变化不敏感,但当建筑密度低于0.55时,风速快速衰减。周围建筑与中心建筑的高度比对中心区域平均风速影响显著,平均风速随高度比增加而降低,当高度比达0.5左右时,存在风速突降点。中心区域平均风速随错落度增加近似线性降低,不同错落形式的风环境差异明显。Pedestrian-level wind environment is an important indicator of human settlements.To study the influence of different layouts of buildings on the wind environment at pedestrian height(Z=1.5 m),computational fluid dynamics was used to simulate the wind environment of a standard urban building model.Firstly,the grid independence test and simulation accuracy test were carried out,and the reliable grid scheme and simulation conditions were determined.Then,through numerical simulation,the distribution law of average wind speed field and trace field in the central area of the standard urban building model was obtained and summarized.By changing the building density,relative height and degree of staggeredness of the building cluster model,the influences of different conditions on the wind environment were studied.The results show that the average wind speed in the central region is higher than that of the incoming flow,and there are several vortex regions.The extreme wind speed zone is directly in front of and behind the central building.The average wind speed in the central area is not sensitive to the change of building density,but when the building density is below 0.55,the wind speed rapidly decays.The height ratio of the surrounding buildings and the central building has a significant impact on the average wind speed in the central area.The average wind speed decreases with the increase of the height ratio.When the height ratio reaches around 0.5,there is a sudden drop in wind speed.The average wind speed in the central region decreases approximately linearly with the increase of the degree of staggeredness,and the wind environment of different staggered forms is significantly different.

关 键 词：行人高度风环境 标准建筑群模型 数值模拟 绿色建筑 计算流体力学 

分 类 号：P425.6[天文地球—大气科学及气象学] TU984[建筑科学—城市规划与设计]