基于数值风洞的桥梁断面三分力系数模拟  

Simulation of Mean Aerodynamic Force Coefficient of Bridge Section Based on Numerical Wind Tunnel

作　　者：李楠[1,2] 陈琦 

机构地区：[1]南阳理工学院土木工程学院,河南南阳473004 [2]武汉理工大学交通学院,湖北武汉430063 [3]南阳市市政工程总公司,河南南阳473000

出　　处：《洛阳理工学院学报（自然科学版）》2014年第1期11-14,26,共5页Journal of Luoyang Institute of Science and Technology：Natural Science Edition

摘　　要：用以计算流体动力学（CFD）为基础的数值风洞代替物理风洞模拟桥梁周围的风场特征,不仅能得到流场的压力、速度和涡旋的分布,还能提取桥梁的各种气动参数,为流固耦合的计算奠定基础。以一大跨度桥梁的扁平箱梁为模型进行了-10°~10°攻角下的风场模拟,通过改变边界条件的方法改变风攻角,提取三分力系数,并将计算结果与已有的风洞试验值相比较,吻合较好,最后绘出的0°攻角下的速度、流线和压力云图可以形象地描述流场的变化情况。验证了采用CFD技术模拟风场特征,识别桥梁三分力系数方法的可行性与可靠性。The wind tunnel method has been replaced by CFD based numerical method to simulate the characteristics of wind field around the bridge, which can not only get the flow field distribution of pressure, velocity and vortex, but also extract the aerodynamic parameters of the bridges, so as to lay a foundation for the calculation of fluid-solid coupling. Taking a flat box girder of a large-span bridge as the model, this paper has carried out a wind field simulation under the wind attack angle of-10o~ 10o, with wind attack angle changing on different boundary conditions, the mean aerodynamic force coefficient extracted, and close results achieved in comparison of numerical simulation and wind tunnel test. The finally profiled velocity, streamline and pressure nephogram could vividly demonstrate the changes in flow field. This paper also testifies the feasibility and reliability of CFD technique in simulating the characteristics of wind field and extracting mean aerodynamic force coefficient.

关 键 词：CFD 数值风洞 三分力系数 标准κ-ε模型 

分 类 号：TU442[建筑科学—岩土工程]