Wind Effects on Dome Structures and Evaluation of CFD Simulations through Wind Tunnel Testing
Wind Effects on Dome Structures and Evaluation of CFD Simulations through Wind Tunnel Testing
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DOI：
10.3390/su15054635
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发表时间：
2023-03
期刊：
影响因子：
3.9
通讯作者：
Tiantian Li;H. Qu;Yi Zhao;R. Honerkamp;G. Yan;A. Chowdhury;I. Zisis
中科院分区：
文献类型：
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作者：
Tiantian Li;H. Qu;Yi Zhao;R. Honerkamp;G. Yan;A. Chowdhury;I. Zisis
本文通过一系列风洞试验，研究了雷诺数为106的直线风对穹顶结构（1/60尺度）的风效应。并进行了计算流体力学（CFD）模拟，包括大涡模拟（LES）和reynolds - average Navier-Stokes （RANS）模拟，并通过与风洞试验数据的对比验证了其性能。结果表明，风荷载一般随上游风速增大而增大，而在近郊地形上，风荷载由于地面摩擦而减小。最大正压通常出现在顶盖迎风面底部附近，这是由于流线的滞止区和发散造成的。由于圆顶的堵塞和流线的收敛，吸力压力最小出现在圆顶的顶端。在所有风荷载中，吸力是最重要的，屋面设计应特别注意适当的抗风能力。数值模拟结果也表明，在穹顶表面平均压力系数和总吸力的分布规律上，LES计算结果与风洞试验吻合较好。与LES相关的子午压力系数的平均误差和均方根误差比与RANS相关的结果小60%左右，而吸力的误差约小40-70%。此外，LES在预测边界层分离位置和再现圆顶后复杂流场方面更为准确，在模拟圆顶周围的涡结构方面更有优势，可以进一步了解流场的非定常和动力学。
In the study, a series of wind tunnel tests were conducted to investigate wind effects acting on dome structures (1/60 scale) induced by straight-line winds at a Reynolds number in the order of 106. Computational Fluid Dynamics (CFD) simulations were performed as well, including a Large Eddy Simulation (LES) and Reynolds-Averaged Navier–Stokes (RANS) simulation, and their performances were validated by a comparison with the wind tunnel testing data. It is concluded that wind loads generally increase with upstream wind velocities, and they are reduced over suburban terrain due to ground friction. The maximum positive pressure normally occurs near the base of the dome on the windward side caused by the stagnation area and divergence of streamlines. The minimum suction pressure occurs at the apex of the dome because of the blockage of the dome and convergence of streamlines. Suction force is the most significant among all wind loads, and special attention should be paid to the roof design for proper wind resistance. Numerical simulations also indicate that LES results match better with the wind tunnel testing in terms of the distribution pattern of the mean pressure coefficient on the dome surface and total suction force. The mean and root-mean-square errors of the meridian pressure coefficient associated with the LES are about 60% less than those associated with RANS results, and the error of suction force is about 40–70% less. Moreover, the LES is more accurate in predicting the location of boundary layer separation and reproducing the complex flow field behind the dome, and is superior in simulating vortex structures around the dome to further understand the unsteadiness and dynamics in the flow field.