均匀流中直立圆柱体绕流三维数值模拟

Three-dimensional numerical simulation of the viscous flow past a vertical circular cylinder

研究直立贯底圆柱体的三维粘性绕流问题。以不可压缩Navier-Stokes方程为控制方程,采用有限体积法和SIMPLE算法,建立了数值模拟方法。考察在不同水平和垂直断面上,圆柱体绕流产生的尾涡和流动速度场的分布特性,成功地数值模拟了直立贯底圆柱体绕流场的三维特性。结果表明,在考虑重力影响的情况下,直立圆柱体周围的流动具有明显的三维特性,而且沿圆柱体轴向不同断面上的尾涡分布是不相同的。

The problem of the uniform viscous flow around a vertical circular cylinder is considered.Based on the incompressible Navier-Stokes equation,both the finite volume method and the SIMPLE algorithm were employed for numerically simulating the presented problem.The three-dimensional characteristics of both the wake vortex and the velocity field generated by the vertical circular cylinder past a viscous flow were successfully simulated.Numerical results show that under the circumstance where the effect of the gravity was considered,the threedimensionality of the viscous flow past the vertical circular cylinder is important.Moreover,there are remarkably different characteristics for the vortex patterns on different horizontal and vertical planes along the vertical circular cylinder.