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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.
Computation of large-eddy simulation of wind field in wind engineering is a numerical method to interpret the generation, development and distribution of wind pressure from the perspective of fluid.Wind-wind field needs to be divided into several sub-blocks and different grid densities are specified respectively according to the degree of wind activity. For each three-dimensional sub-block, an algorithm to collect non-matching information is proposed to calculate the wind flux between sub-blocks.According to the regularity of structure grid, The gridlines of the two sub-blocks are merged into a set of grids to divide the common interface into facets and form the joint information to solve the problem in the whole field. The typical example shows that the computational resources can be saved while ensuring the accuracy A smooth transition of the grid density solves a basic problem for the wind field simulation of a long-span structure.