层流状态下有限长圆柱体绕流的模拟研究  

Simulation study of the flow around a finite-length cylinder in laminar flow

作　　者：关庚 应宇翔 董雷 聂德明[1] GUAN Geng;YING Yuxiang;DONG Lei;NIE Deming(Institute of Fluid Mechanics,China Jiliang University,310018 Hangzhou,China;Hangzhou Baize New Technology Company Limited,310018 Hangzhou,China)

机构地区：[1]中国计量大学流体力学研究所,杭州310018 [2]杭州白泽新能科技有限公司,杭州310018

出　　处：《应用力学学报》2025年第2期454-464,共11页Chinese Journal of Applied Mechanics

摘　　要：基于计算流体力学软件Fluent,采用有限体积法求解不可压缩N-S方程,模拟了层流状态下高径比h/d=8(h和d分别为圆柱体的高度和直径)的有限长圆柱体的绕流问题。柱体的一端固定在壁面(即固定端),另一端无约束(即自由端)。基于圆柱体直径的雷诺数范围为40≤Re≤400。模拟研究得到了柱体绕流的尾流流场特性及其升阻力系数、Strouhal数等。结果表明,柱体升力系数的峰值、平均阻力系数和Strouhal数均低于二维圆柱的数值,主要原因来自于柱体自由端与固定端的流场结构。同时,研究发现了升力系数的峰值随Re的增大呈现出先增后减的规律,论文对此问题进行了定量分析。Based on the computational fluid dynamic(CFD)software Fluent,the finite volume method is used to solve the incompressible N-S equation,and the flow around a finite-length cylinder with a height-to-diameter ratio of h/d=8(h and d are the height and diameter of the cylinder,respectively)under laminar flow is simulated.The ground of the cylinder is fixed on the wall surface(fix end),and the top surface is unconstrained(free end).The Reynolds number range based on the diameter of the cylinder is 40≤Re≤400.The simulation research has obtained the characteristics of the wake flow field of the flow around the cylinder,lift-drag coefficient,and Strouhal number.The results show that the peak value of the lift coefficient,the average drag coefficient and the Strouhal number of the cylinder are all lower than the values of the two-dimensional cylinder,mainly due to the flow field structure of the free end and the fixed end of the cylinder.At the same time,the study found that the peak value of the lift coefficient increased first and then decreased with the increase of Re.The paper carried out a quantitative analysis on this problem.

关 键 词：计算流体力学 有限体积法 柱体绕流 升阻力系数 

分 类 号：O357[理学—流体力学]