风场大涡模拟中网格非匹配算法  

Non-matching algorithm in large eddy simulation of wind field

作　　者：李重阳[1] 魏德敏[1] 王仕统[1] 

机构地区：[1]华南理工大学土木与交通学院,广东广州510640

出　　处：《空间结构》2010年第4期8-13,共6页Spatial Structures

基　　金：科技部重大基础研究前期研究专项项目(2004CCA03300)

摘　　要：计算风工程中对风场进行大涡模拟是从流体角度诠释风压产生、发展、分布的数值方法.风场需分割为多个子块,并根据风活跃程度分别指定不同的网格密度,在各块界面上网格非一一匹配.本文针对三维子块,提出了一种搜集非匹配信息的算法,用以计算子块间的风流体通量.根据结构网格规律性,将公共界面上两个子块的网格线合并为一套网格,从而将公共界面划分为小面,形成联接信息进行全场联立求解.典型算例表明可在节省计算资源的同时保证精确性,同时实现网格密度平滑过渡,为大跨度结构风场模拟解决了一个基础问题.Large eddy simulation in computational wind engineering investigates generation,development and distribution of wind pressure in the view of fluid.The wind field should be divided into sub-blocks which are appointed different grid density according to local wind activity.The grids do not match in common interfaces.For three-dimensional sub-blocks,an algorithm collectting connection information to calculate fluxes is proposed.According to the regularity of structural grid system,grid lines of two sub-blocks are merged and then splited common interface into small facets.The domain is solved simultaneously with the collected connection information.Large eddy simulation for typical case shows that computing resource can be saved while ensuring accuracy and mesh density varies between sub-blocks,which solves one of the basic problem in wind simulation of large span structures.

关 键 词：计算风工程 多块结构网格 非匹配 风场 大涡模拟 

分 类 号：TU312.1[建筑科学—结构工程]