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大跨度球面网壳在其风工程分析中包含了风的分离、再附着等最复杂部分,曲面表面风压系数的分布变得异常复杂。针对风压系数分布问题利用FLUENT和计算流体力学(CFD)技术,在选用SST-湍流物理模型的基础上,改变球面网壳矢跨比、球面网壳高度、风速、风向攻角及球面网壳半径等不同参数,计算分析了球面网壳表面风压系数的变化规律。为快速准确的得出网壳表面风压系数,提出了风压系数分布的二维几何平面拟合方法并得出拟合公式。最后将公式应用到已有的风洞实验结果,得到其风压分布趋势和实验结果基本相符。
In its wind engineering analysis, the long-span spherical reticulated shell contains the most complicated parts such as wind separation and reattachment, and the distribution of wind pressure coefficient on the surface becomes extremely complicated. Based on the SST-turbulence physical model, FLSENT and computational fluid dynamics (CFD) were used to change the ratio of spatiotemporal reticular shell to span, the reticular shell height, wind speed, wind direction and angle of attack, Radius and other parameters, calculated the variation of the pressure coefficient of the surface of the spherical reticulated shell. In order to obtain the wind pressure coefficient of the shell surface quickly and accurately, a two-dimensional geometric plane fitting method of wind pressure coefficient distribution was proposed and the fitting formula was obtained. Finally, the formula is applied to the existing wind tunnel experiment results, and the wind pressure distribution trend is basically consistent with the experimental results.