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利用计算流体动力学(CFD)方法,对粘性不可压缩流体流过平板上直立圆柱的绕流进行了三维数值模拟,采用了有限体积法和SIMPLE计算程式,利用不可压缩的Navier-Stokes方程,模拟了雷诺数在200的层流绕流流动。在建立贴体的结构化精细网格之后,成功模拟了马蹄涡,与经典的理论对比具有较好的吻合性。同时得到了交接部区域的剪切力云图。计算结果表明,主/附体结构交接部区域流动机理十分复杂,在这个区域有马蹄涡的存在,是产生交接部冲蚀的根本原因。计算结果表明本文所用方法在模拟含有复杂流动机理的圆柱绕流中是可靠性的。
Using CFD method, a three-dimensional numerical simulation of the flow of viscous incompressible fluid through an upright cylinder on a flat plate was performed. The finite volume method and the SIMPLE calculation program were used. The incompressible Navier-Stokes equation was used to simulate The Reynolds number of 200 laminar flow around the flow. After building the structured fine mesh body, the horseshoe vortex has been successfully simulated, which is in good agreement with the classical theory. At the same time, we got the shear force cloud image in the area of junction. The calculation results show that the flow mechanism of the interface between the main structure and the annex structure is very complicated, and the presence of horseshoe vortex in this area is the root cause of the junction erosion. The results show that the method used in this paper is reliable in simulating circular flow around a complex flow mechanism.