基于SST k-ω湍流模型的高层建筑体型系数数值研究

Numerical Anlysis of Shape Coefficient of High-Rise Building Based on SST k-ω Turbulence Model

目的研究建筑物高度和宽度的变化对其表面绕流流场的影响,分析建筑物风荷载体型系数的变化,为结构设计人员在结构抗风设计方面提供参考.方法利用计算流体动力学软件STAR-CCM+,选用基于雷诺平均(RANS)的SST k-ω湍流模型,对不同高度和宽度的建筑物进行数值模拟,计算建筑物风荷载体型系数.结果在宽度相同的情况下,随着高度的增加,正面、侧面和背面的体型系数绝对值增加;随着宽度的增加,侧面和背面的体型系数绝对值增加,而正面影响不大.结论高层建筑的体型和体量对风荷载体型系数有一定的影响,在结构抗风设计中应该适当予以考虑.

This paper aims at researching the shape coefficient of tall buildings with the different height and width by comparing some influences on the velocity distribution and pressure field to provide reference for the structure designers in the structure design of wind resistance. Based on SST k-ω turbulence model of STAR-CCM ＋ （ software of Computational Fluid Dynamics）, several numerical models with different height and width are founded. The surface pressures are simulated, and then the shape coefficient of these tall build- ings is calculated and compared. The result shows that the absolute values of the shape coefficients of the fa- cade, the side and the back of the building increase when the height of the building increases. The absolute value of shape coefficient of the side and the back of the building increases when the height of the building increases, but shape coefficient of the facade of the building is influenced unobviously. The shape and size of the building has some influences on the shape coefficient, it should be considered appropriately in wind resistant design of the high-rise buildings.