大气边界层中结构风载的计算方法比较  

Comparison for Computational Methods to Structures of Wind Loads in Atmospheric Boundary Layer

作　　者：杜强[1] 谭三[2] 刘宁[2] 

机构地区：[1]西华大学机械工程与自动化学院,四川成都610039 [2]西华大学数学与计算机学院,四川成都610039

出　　处：《计算机与现代化》2012年第9期137-139,142,共4页Computer and Modernization

基　　金："十一五"总装预研基金资助项目(YG060101C);四川省教育厅自然科学重点项目(12ZA162);西华大学重点科研基金资助项目(Z1120226)

摘　　要：风载是大气边界层中露天结构的主要侧向载荷。针对目前工程中普遍采用的理论计算方法及计算流体动力学(Computational Fluid Dynamics,CFD)方法,分别论述利用CFD方法和理论计算方法计算结构风压及风载的原理。采用基于Reynolds时均N-S方程和标准k-ε湍流模型对一简单结构在不同高度的风压分布进行数值模拟,分析结构表面风压的分布特性,在此基础上比较两种计算方法的优劣。研究结果表明,由于未考虑结构脉动风载,数值计算结果较理论计算更小,但CFD方法可以获得风场中参数的更多信息,在对复杂结构的风载计算方面更方便有效。Wind load is one of mainly lateral loads on structures in atmospheric boundary layer. Aimed to the method of theoreti- cal computation and Computational Fluid Dynamics that are adopted by engineering widely, the principle about two methods to compute the wind pressure and wind loads on structures is elaborated. Furthermore, the pressure distributions on a simple struc- ture with different elevation are numerically computed based on the Reynolds-averaged N-S equations and the standard k-~ turbu- lent model, and the characteristics of the wind pressures on the structure are discussed, then two computational methods are com- pared. The computed results show that the wind loads on the structure computed by numerical method are lower than those of the- oretical method because the fluctuating wind loads on the structure are ignored. But, CFD can obtain more information for the pa- rameters in wind field, and it is more convenience for computation of wind loads on structures with complex shape.

关 键 词：风载 大气边界层 计算方法 结构 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构]