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超高层三塔连体建筑的主塔由于两子塔和裙楼的干扰效应,其风荷载的确定相比单个超高层建筑更加复杂。本文主要基于CFD方法,采用了标准κ-ε、RNGκ-ε、SSTκ-ω、大涡模拟(LES)四种不同的湍流模型对某超高层三塔连体建筑进行了不同风向角下的数值模拟计算,并与风洞试验数据作对比,验证了数值模拟的有效性。结果表明:不同湍流模型对该三塔连体建筑上游影响并不明显,κ-ε和SSTκ-ω模型计算结果较为接近,尾流呈现对称分布,而RNGκ-ε和LES结果较为接近,尾流呈现非对称涡状分布;不同湍流模型计算得到的迎风面风压值大致相同,背风面和侧风面风压系数值有一定波动;主塔迎风面风压极大值出现在塔高2/3高度左右,两侧同一高度处出现极大值,且与风洞实验规律一致,屋顶棱角尖锐部位压力线较密集;整体体型系数的取值需要考虑主塔两侧的子塔遮挡效应。
Due to the interference effect between the two towers and the podium, the main tower of the super high-rise three-tower Siamese building determines the wind load more complex than a single super-tall building. Based on the CFD method, four different turbulence models of standard κ-ε, RNGκ-ε, SSTκ-ω and LES are used to analyze the numerical value of a super high-rise three- Simulation results are compared with wind tunnel test data to verify the effectiveness of numerical simulation. The results show that the turbulence model has no obvious effect on the upstream of the three towers. The calculation results of κ-ε and SSTκ-ω models are close to each other, the wake distribution is symmetrical, and the RNG κ-ε and LES results are close, The windward pressure values of the windward side and the sidewind winds fluctuate a certain amount; the maximum pressure of windward pressure on the windward side of the main tower appears at 2 / 3 height, the same height on both sides of the maximum value, and consistent with the wind tunnel experiment, the sharp corners of the roof pressure lines more intensive; the overall size factor values need to consider the tower on both sides of the sub-shelter effect.