某大型体育场屋盖风致积雪飘移的数值模拟  

Numerical Simulation on Snow Drifting for a Large Cantilevered Stadium

作　　者：李雪峰[1] 李洪求 周晅毅[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092 [2]北京维拓时代建筑设计有限公司,北京100025

出　　处：《结构工程师》2010年第6期64-69,共6页Structural Engineers

基　　金：国家自然科学基金(50608060)资助

摘　　要：大型悬挑屋盖上的积雪在风力作用下会发生复杂的飘移运动,导致积雪不均匀分布,对结构的强度和稳定性产生较大的影响。基于空气相和雪相的关系为单向耦合的假设,采用两相流理论模拟了积雪在风作用下的飘移过程。以某大型体育场为研究对象,通过对商业流体软件FLUENT二次开发,计算了在风作用下屋盖积雪发生迁移后的雪压分布,并对雪压分布的规律进行了分析,为结构设计提供依据。Snow on large cantilevered roof surface will be drifted when wind blows,which probably leads to uneven snow distribution.Certain situation of uneven snow load would affect strength and stability of the structure greatly.Drifting snow in wind is considered in this paper as a two-phase flow problem.The mixture of air and snow is assumed to be one-way coupled so that the air phase can be treated as unaffected by the airborne snow,and the snow transport is mainly controlled by the air flow and surface conditions.The numerical simulation employs the commercial CFD software,FLUENT,with additional user C code added to model snow drift.The regularity of the redistribution of snow loads on the roof surface of a certain large cantilevered stadium is discussed in the paper,which provides a basis for design of the structure.

关 键 词：大型悬挑屋盖 两相流 飘移运动 

分 类 号：TU312.1[建筑科学—结构工程]