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为了探索有效的钝体结构气动特性三维数值分析方法,对钝体结构倒U形梁的气动特性进行了风洞试验和数值模拟研究.通过风洞试验得到与结构气动特性相关的气动力系数和颤振导数.利用二维或三维模型分别对结构的气动特性进行了数值模拟研究,并计算了相关的气动参数.计算过程中基于分块迭代耦合方法考虑流体-固体耦合效应,利用自编程序结合CFX软件实现不同物理场间的数据交换和传递,采用快速有效的网格移动控制算法处理移动边界问题.风洞试验测量和数值计算中均考虑了湍流效应,其中数值计算应用了k-ω剪切应力输运模型和分离涡模型.通过风洞试验测量与数值模拟研究可以发现,钝体结构倒U形梁的气动稳定性较差.对气动参数的计算结果表明,本文的三维数值计算方法可以有效地获取钝体结构的气动参数,在风工程领域具有重要应用价值.
In order to explore the effective three-dimensional numerical analysis method of aerodynamic characteristics of bluff body, wind tunnel test and numerical simulation are conducted on the aerodynamic characteristics of bluff body inverted U-shaped beam.An aerodynamic coefficient Flutter derivative. The aerodynamic characteristics of the structure were numerically simulated by two-dimensional or three-dimensional models and the related aerodynamic parameters were calculated. The fluid-solid coupling effect was considered based on the iterative block coupling method in the calculation process. Combining CFX software to realize the data exchange and transfer between different physics fields, a fast and effective mesh movement control algorithm is used to deal with the moving boundary problem.Value turbulence effect is taken into account both in wind tunnel test and numerical calculation, in which k-ω Shear stress transport model and separation vortex model.According to the wind tunnel test and numerical simulation, it can be found that the aerodynamic stability of inverted U-shaped beam with bluff body is poor.The calculation results of aerodynamic parameters show that the three-dimensional numerical calculation The method can effectively obtain the aerodynamic parameters of bluff body structure and has an important application value in the wind engineering field.