摘要
基于欧拉-欧拉多相流模型,以雨滴谱及雨滴降落末速度确定雨滴体积分数并构成雨相组分边界;采用Realizable k-ε湍流模型封闭求解N-S方程的新型WDR数值方法,模拟研究了单体多层、高层建筑及群体布局建筑的迎风面雨量分布特性。分析结果表明:单体建筑WDR抓取率分布呈由下至上、由中间向两侧增加的规律,整体WDR抓取率随风速和雨强的增大而呈增大趋势;群体布局时,前排建筑迎风面WDR抓取率分布仍类似于单体,随间距减小而减小;后排建筑在迎风面顶端两侧仍出现较大抓取率,其值随前后间距(顺风向)减小而大致减小,随左右间距(横风向)减小而大致增大;后排建筑迎风面与前排建筑等高的两侧区域,WDR抓取率出现突增,其值随前后间距减小而增大,随左右间距减小而先增大后减小;交错布局时,后排建筑迎风面顶端拐角区域的WDR抓取率较单体增加显著。模拟分析获得的建筑迎风面雨量分布规律及布局干扰特性可为相关领域的研究与设计提供指导。
In view of the increasing influence on building due to the extreme rainfall, it is necessary to research on the distribution characteristics of wind-driven rain(WDR) on building. Based on Euler-Euler multiphase flow model, the volume fraction of raindrop and velocity of raindrop are determined to define the component boundary conditions with the raindrop spectrum and raindrop terminal velocity formula, and the Realizable k-ε turbulence model are used to solve Navier-Stokes equations closely to acquire the information of WDR field. With this new numerical method, WDR around a single multi-story and high-rise building and building complex are researched.The distribution features of WDR catch ratio on windward facades are analyzed. For a single building, WDR catch ratio increases from bottom to top and from middle to both sides gradually on its windward facade. WDR catch ratio increases with increasing wind velocity and rain intensity. Under the complex layout, WDR catch ratio distribution on the windward facades of front buildings is similar to that of single building, and it decreases with decreasing spacing between buildings. For the back buildings, the lager WDR catch ratio appears on the top-corner area of windward facades, and it decreases with decreasing spacing between the front and back direction(downwind direction) approximately, but it increases with decreasing spacing between the left and right direction(across-wind direction) approximately. WDR catch ratio on the areas of windward facades where height is equal to height of front buildings increases sharply, and it increases with decreasing spacing between the front and back direction, but increases at first then decreases with decreasing spacing between the left and right direction. Under the staggered layout, WDR catch ratio on the top-corner area of windward facade for back building exceeds the maximum of single building significantly. The laws about WDR distribution on windward facades of buildings and the interference characteristics about layouts
出处
《应用力学学报》
CSCD
北大核心
2014年第4期539-544,5,共8页
Chinese Journal of Applied Mechanics
基金
中央高校基本科研业务费专项资金(2013HGXK0015)
安徽省自然科学基金(11040606M116)
教育部留学回国人员科研启动基金
关键词
建筑风驱雨
欧拉模型
抓取率
群体布局
建筑间距
wind-driven rain around building,Euler-Euler model,catch ratio,complex layout,spacing between buildings
