基于CFD和城市形态参数的风环境评价

风环境对城市居民舒适度影响较大，是城市气候研究的重点。以大庆市东城区为对象，研究基于计算流体力学（computational fluid dynamics，CFD）和城市形态参数的风环境评价方法。首先使用CFD软件对城市中心片区进行风环境模拟，得到风速云图；再将风速云图分割为多个网格，利用SPSS计算得到网格风速比与城市形态参数的回归拟合方程；最后通过回归拟合方程，计算东城区全域的风速比，评价风环境。结果表明,天空开阔度和迎风面积密度是影响风速比的最主要城市形态参数，综合多种城市形态参数能更好地解释风速比的变化；结合风速比计算方程和风环境评价标准能够发现城市中风环境不良的区域并提出优化建议。

Wind environment assessment based on CFD and urban morphology parameters

Wind environment has a considerable influence onurban residents′ comfort,which is the focus of urban climate research. TakingDongcheng District of Daqing City as an example, a wind environment assessmentmethod based on CFDcomputational fluid dynamics） and urban morphology parameters was studied. First, the windenvironment in the central area of the city was simulated by CFD software toobtain the wind speed nephogram. Then, the wind speed nephogram was dividedinto grids, and the regression equation between grid wind speed ratio and urbanshape parameters was obtained by SPSS. Finally, the wind speed ratio ofDongcheng District was calculated by the regression fitting equation, and thewind environment was evaluated. Results show that sky openness and windwardarea density are the most important urban morphological parameters affectingthe wind speed ratio, and the combination of multiple urban morphologyparameters can explain the change in wind speed ratio better. Thus, bycombining the wind speed ratio calculation equation and wind environmentevaluation standard, the bad wind environment areas in a city can be found andrelevant optimization suggestions can be proposed.