高层建筑典型断面绕流的非定常数值模拟

Unsteady Numerical Simulation of Flow Around Typical Sections of High-Rise Buildings

基于专业计算流体动力学软件ANSYS FLUENT12.0,采用SST湍流模型对4种典型钝体断面的非定常绕流特性进行了研究。对方形断面绕流的模拟结果表明,SST湍流模型应用于钝体绕流的模拟是可行的。获得了倒圆角、倒斜角和倒凹角方形断面的阻力系数、斯托哈托数及时均流场图,为此类断面的抗风分析提供了合理的气动参数,并从流场的角度定性地对计算结果进行了机理解释。

Based on the ANSYS FLUENT 12.0, the characteristics of the unsteady flow around four typical bluff body sections are investigated using the SST turbulence model. The simulated results of flow around a square section show that the SST turbulence model is feasible on simulating the flow around a bluff body. The drag coefficient, Strouhal number and time-averaged flow field of a square section with rounded, bevel and concave corner cutoffs are obtained, which provide a reasonable aerodynamic parameters for the wind resistance analysis of this kind of section. The mechanism of the results is explained qualitatively from the view of the flow field.