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风驱雨(Wind-Driven Rain,简称WDR)是建筑立面最主要的水分来源之一,对结构耐久性和建筑温湿性能存在重要影响。目前,WDR分布特性的研究主要针对单体布局,考虑群体布局条件下建筑立面WDR受气动干扰影响的研究仍比较缺乏,并且基于立面区域性特征的WDR气动干扰研究更为缺少。基于欧拉多相流模型的CFD数值模拟方法,在利用某群布局建筑WDR实测数据验证数值方法的基础上,模拟分析某两串列布局建筑WDR场,通过对气动干扰不同影响因素的定量分析,获取不同影响因素下受扰建筑迎风面中线位置抓取率、测点抓取率比值、局部区域干扰因子的气动干扰变化规律。结果表明:受扰建筑迎风面WDR干扰效应受施扰建筑高度和风速变化影响较大,而受建筑间距和雨强变化影响相对较小。对于建筑WDR干扰研究,局部区域干扰因子能更好地反映气动干扰对立面WDR分布的影响。
Wind-Driven Rain (WDR) is one of the most important sources of moisture in building façades and has important implications for structural durability and building’s temperature and moisture performance. At present, the research on the distribution characteristics of WDR mainly focuses on the layout of single cells. However, there are still few studies on the influence of aerodynamic interference on the WDR of building facades under the conditions of population distribution. Moreover, the study of WDR aerodynamic interference based on the regional characteristics of the façade is still scarce. Based on Eulerian multiphase flow model CFD numerical simulation method, WDR field of a series of serial and serial buildings was simulated and analyzed by using the numerical method of WDR measured data of a group of buildings. Based on the quantitative analysis of different influencing factors of aerodynamic interference The variation rules of the air disturbance of the disturbed building windward surface midline location, the ratio of measuring points and the disturbance factor of local area were obtained under different influence factors. The results show that the interference effect of the WDR on the windward side of the disturbed building is greatly affected by the height of the disturbance building and the change of the wind speed, but is relatively less affected by the variation of the building spacing and the rainfall intensity. For the research of WDR interference in buildings, the local interference factor can better reflect the influence of the WDR distribution on the obverse surface of the aerodynamic interference.