平稳风荷载的数值模拟及CFD应用  

Numerical simulation of steady wind load and CFD application

作　　者：白泽升 王孟鸿 王世方 BAI Zesheng;WANG Menghong;WANG Shifang(School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]北京建筑大学土木与交通工程学院,北京100044

出　　处：《建筑结构》2021年第S02期248-252,共5页Building Structure

摘　　要：大气边界层内自然风具有非定常性,而大涡模拟(LES)技术是基于计算流体力学进行风场瞬态模拟计算的有效方法,同时风场来流边界条件的给定是模拟结果准确性的关键。基于谐波叠加法采用Matlab编程实现脉动风速合成,模拟风能很好满足自然风功率谱、空间相关性和相位角等特性。对FLUENT平台进行二次开发,将模拟得到的自然风速作为入口边界条件,采用大涡模拟(LES)技术进行某筒壳结构周围风场的数值风洞模拟计算,得到结构表面风压时程数据,模拟结果与风压分布规律相吻合。将风荷载模拟技术应用于实际工程结构的CFD模拟计算中,为相关研究提供借鉴。Natural wind in the atmospheric boundary layer is unsteady, and Large Eddy Simulation(LES) is an effective method for transient simulation calculation of wind field based on computational fluid dynamics. At the same time, the boundary conditions of the wind field are given by the accuracy of simulation results. Based on the harmonic superposition method, Matlab programming is used to realize the synthesis of fluctuating wind speed, and the simulated wind energy satisfies the characteristics of natural wind power spectrum, spatial correlation and phase angle. The FLUENT platform was redeveloped. The simulated natural wind speed was used as the inlet boundary condition, and the LES technology was used to carry out the numerical wind tunnel simulation calculation of the wind field around a cylindrical shell structure to obtain the time history data of the wind pressure on the surface of the structure.The simulation results are consistent with the wind pressure distribution law.The wind load simulation technology is applied to the CFD simulation of practical engineering structures to provide reference for related research.

关 键 词：大涡模拟 谐波叠加法 数值风洞 工程应用 

分 类 号：TU312.1[建筑科学—结构工程]