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为了研究局部开洞的折叠网壳结构表面风压分布,基于流体动力学基本原理,探讨了房屋局部开洞下计算域的选取,计算方法、边界及壁面条件的确定。运用计算流体动力学软件Fluent6.3建立了计算模型,数值模拟得到开洞结构内外表面风压系数等值线的分布。在此基础上,分析了开洞结构房屋在不同风速,不同风向角,不同开洞位置及大小等主要因素下风场的分布规律,并与未开洞结构表面风压分布规律和内压系数估算公式所得到的结果进行了对比,其规律性吻合较好。通过内外表面风压系数,得到净体型系数的分布,提出应用于抗风设计的净体型系数分布表。
In order to study the wind pressure distribution on the surface of the folded reticulated shell with partially open holes, the selection of computational domain, calculation method, boundary and wall conditions are discussed based on the basic principles of fluid dynamics. The computational fluid dynamics software Fluent6.3 was used to establish the computational model, and the distribution of the air pressure coefficient isoline was obtained by numerical simulation. On this basis, the distribution of wind field under different wind speed, different wind direction angle, different location and size of open hole is analyzed, and the distribution of wind pressure on the surface of unopened structure and the estimation of internal pressure coefficient The results obtained by the formula are contrasted, and their regularity is good. Through the inner and outer surface wind pressure coefficient, the distribution of the net body coefficient is obtained, and the net body coefficient distribution table applied to the wind resistance design is proposed.