大跨度椭球屋盖结构风压分布的风洞试验和数值模拟

Wind tunnel experiment and numerical simulation of wind pressure distribution of long-span ellipsoidal shell structure

根据九寨沟甘海子国际会议度假中心温泉泳浴中心的风洞试验结果,分析了该结构屋面在风荷载作用下的受力性能.分别采用基于雷诺时均方程的标准k-ε、重正化群(RNG)k-ε、可实现的k-ε和雷诺应力模型(RSM)4种湍流模型对屋面平均风压进行了数值模拟,并将4种湍流模型的模拟结果与风洞试验数据进行了比较.结果表明,此类大跨度椭球屋面风压分布主要以吸力为主,靠近地面的屋面迎风面和背风面风压为正压.4种湍流模型的模拟结果之间差异较小,数值方法能够较准确地模拟该类大跨度椭球屋面的风压分布.在定量分析时采用高精度的离散格式可以提高计算精度.

The wind tunnel experiment of the hot spring swimming center in Jiuzhaigou International Convention and Vacation Center was carried out to investigate the structure behavior under wind loads. The mean wind pressures on the roof were simulated using the Reynolds averaged Navier-Stockes equation with four turbulence models, standard k-ε, renormalization group （RNG） k-ε, realizable k-ε and Reynolds stress model （RSM）. The results show that the wind loads on the roof structure are mainly suctions, and the wind loads on the windward and leeward of the roof structure near the ground are positive. The differences among the results of four turbulence models were not notable. Numerical simulation is effective to predict the wind pressures on the long-span ellipsoidal shell structure, and the quantitative analysis precision can be improved using high-order discretization scheme.