组合布局对建筑立面风驱雨分布影响特性的数值分析

风驱雨（Wind-Driven Rain，简称WDR）是建筑外立面最主要的水分来源，为外墙材料耐久性能及建筑温湿环境的重要影响因素。目前，WDR分布特性的研究主要针对单体建筑布局，考虑群体布局条件下建筑立面WDR分布以及受布局扰动影响的研究仍比较缺乏。基于欧拉多相流模型的WDR数值模拟方法，在验证方法对两建筑串列布局下较复杂WDR场具有较好模拟适用性的前提下，针对两建筑串列布局方式，考虑施扰建筑高度(h)及间距(d)变化，模拟不同工况下受扰建筑迎风面WDR分布，通过与单体布局情况进行比较，重点分析受扰建筑迎面风WDR分布特点及局部区域WDR变化规律，获取该布局变化时气动干扰对受扰建筑迎风面WDR分布的影响特性。结果表明：受扰建筑迎风面WDR分布受施扰建筑高度变化影响较大，受间距变化的影响相对较小，而局部区域干扰因子更能有效反映受扰建筑立面WDR分布的气动干扰影响。

Numerical simulation for influence of combination layout on wind-driven rain distribution on building facades

 Wind-driven rain (WDR) is one of the main moisture sources of building facades and an important influencing factor for the durability of wall material and hygrothermal performance of building. Nowadays, most of wind-driven rain (WDR) studies reported in the literature focused on isolated building layout, while studies for WDR distribution on building facades affected by combination layout and aerodynamic interference of layout were relatively absent. The WDR simulation approach based on the Eulerian multiphase model was employed here. After verifying the good applicability of this approach to complex situations of WDR field for two tandem buildings, WDR simulations were performed for the interfered building under different working conditions, considering the tandem layout of two buildings and the interfering building with different building height (h) and different building spacing (d). WDR distribution on the windward facades for the interfered building were obtained and compared with isolated building. The characteristics of WDR distribution on the interfered building and the variation law of WDR in local region were analyzed. Consequently, the influence characteristics of aerodynamic interference of WDR distribution on the interfered building facades under different layouts were obtained. The results show that the WDR distribution on windward facades of the interfered building may be significantly affected by the height of the interfering building, but the influence of building spacing is relatively smaller. The influence of aerodynamic interference on WDR distribution on the interfered building facade can be effectively reflected by the local region interference factor.