北京交通大学学报2013，Vol.37Issue(1)：140-144,5.
下击暴流作用下平屋面风荷载CFD数值模拟
CFD numerical simulation of downburst wind effect on flat roofs
摘要
Abstract
Wind profiles and characteristics in thunderstorm downburst are significantly different from the regular boundary layer winds. Based on the computational fluid dynamics (CFD) commercial software, thunderstorm downburst is simulated in the 1:2 000 geometry scales, and the results are compared to the theoretical model. Effects on mean pressure coefficients of the distance from the roof to the center of the downburst are investigated by placing flat-roofs at different radial locations. Pressure coefficients and flow velocity around the roof are analyzed and compared to the results in the boundary layer winds. The results show that numerical simulations can appropriately reproduce the wind profiles and characteristics of the downburst. The pressure coefficient distribution of flat-roofs in the thunderstorm downburst is obviously different from that in the boundary layer winds. The pressure coefficient distribution depends on the distance between the flat-roof and the center of the thunderstorm down-burst. The pressure of the roof gradually changes from positive value to negative when the flat-roof is moved away from the center of the impinging jet.关键词
下击暴流/平屋面/CFD数值模拟/风压系数Key words
downburst/ flat roofs/ CFD numerical simulation/wind pressure coefficient分类
建筑与水利引用本文复制引用
陈波,贾蕗宇,田晨..下击暴流作用下平屋面风荷载CFD数值模拟[J].北京交通大学学报,2013,37(1):140-144,5.基金项目
国家自然科学基金资助项目(50938008) （50938008）
中央高校基本科研业务费专项资金资助(2011JBM270) （2011JBM270）
北京市自然科学基金资助项目(8112023) （8112023）
