串列双圆柱静止绕流的二维数值仿真分析

TWO-DIMENSIONAL NUMERICAL SIMULATION OF STATIC FLOW INTERFERENCE BETWEEN TWO CIRCULAR CYLINDERS IN TANDEM

利用CFX软件建立二维流场模型,采用有限体积法针对串列双圆柱的静止绕流现象进行了数值模拟计算。首先计算了雷诺数Re=200,不同间距时上下游圆柱的斯托罗哈数,并与参考文献的计算结果进行了对比,证明了该文计算的可靠性。然后分析了不同间距时上下游圆柱的升力系数和阻力系数的变化特点,得出了Re=200时双圆柱绕流的临界间距在3.375D^3.5D之间。最后通过对不同间距下流场变化的研究得出:上下游圆柱的间距小于临界间距时,上游圆柱不存在旋涡脱落;超过临界间距时,上游圆柱出现旋涡脱落;下游圆柱始终存在旋涡脱落现象。研究成果能够为计算流体力学和空气动力学技术的发展提供理论基础。

With CFX software, a two-dimensional model of a flow field is built to study on the flow past two circular cylinders in a tandem arrangement by using the finite volume method. Firstly, the upstream and downstream cylinder Strouhal in different spacing are analyzed at Re=200. Through the comparison between the calculation results and previous literature results, the computation in this paper is proved reliable. Then the changing characteristics of lift and drag coefficients of the upstream and downstream cylinders in different spacing are researched. It is obtained that the critical distance of the flow between two circular cylinders in tandem is 3.375D-3.5D at Re= 200. Finally, some conclusions are gained though the changes in the flow field in different spacing： when the distance between the upstream and downstream cylinders is less than the critical distance, vortex shedding of the upstream cylinder does not exist; when the distance between the upstream and downstream cylinders is more than the critical distance, vortex shedding of the upstream cylinder occurs; the phenomenon of vortex shedding of downstream cylinder always exists. The results of the research provide a theoretical basis for the development of computational fluid dynamics and Aerodynamics.