平板上直立圆柱三维绕流的CFD计算研究

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。

CFD Calculation and Research of the Flow around a Circular Cylinder Mounded on a Flat Plate

A uniform viscous and incompressible flow around a circular cylinder mounded on a flat plate was numerically simulated.The CFD method is used to calculate hydrodynamic characteristics of the flow and the finite volume method for incompressible Navier-Stokes equations is employed in this paper.The Reynolds numbers is 200 in the present laminar flow computation. With the help of fine grid we get the horseshoe vortex which is suited to the classic theory.At the same time we get the contours of wall shear stress. It is found that there are horseshoe vortexes in the connected area,which is the cause of wall shear stress. It is also found that that our method is reliable in the flow simulation around the circular cylinder mounded on a flat plate.