附加杆对圆柱水动力特性的干扰作用分析  

Interference Effect of the Small Cylinder on the Turbulent Characteristics Under the Subcritical Reynolds Number

作　　者：格日乐[1] 闫亭 Ge Rile;Yan Ting(HulunBuir University,Hailar Inner Mongolia 021008,China;Seazen Group Limited,Shanghai 200333,China)

机构地区：[1]呼伦贝尔学院,内蒙古呼伦贝尔021008 [2]新城控股集团股份有限公司,上海200333

出　　处：《科技通报》2022年第1期8-12,共5页Bulletin of Science and Technology

摘　　要：钝体绕流是海洋工程中常见的流动现象。圆柱作为具有代表性钝体结构,可用于探究钝体尾流控制或水动力优化方法的经典力学模型。本文采用高精度数值方法研究了紊流状态下附加小直径杆对圆柱水动力特性的影响特性。模拟中,2个控制杆的直径为d/D=0.04(d为控制杆直径,D为圆柱直径),对称布置在圆柱流动分离产生的分离剪切层内(x/D,y/D)=(0.7D,±0.7D)处。模拟结果显示,相比单一圆柱,在圆柱尾流区增设控制杆后,控制杆所产生的扰动显著改变剪切层的动力特性和尾流的拓扑结构,回流区长度比单个圆柱明显缩短,作用在圆柱的水动力显著提高。通过流场可视化结果,可以观察到近尾流区湍流强度的明显增强效应,显示在紊流条件下附加控制杆对圆柱水动力特性产生的影响不同于层流条件下的结果。Flow around bluff bodies is a widespread phenomenon in marine engineering applications. As one of the most representative bluff body structures, flow around a circular cylinder is a classical hydrodynamic model for studying wake control or hydrodynamic optimization. Based on the spectral/hp element method, the influence of the additional control small rods behind a main circular cylinder on the turbulent characteristics under the subcritical Reynolds number is studied in the present investigation. The diameter of the two control small rods is d/D=0.04(d is the diameter of the control cylinder, and D is the diameter of the main cylinder), which is symmetrically arranged in the separation shear layer generated by the main cylinder(x/D, y/D)=(0.7D, ±0.7D). Compared with a single cylinder, the dynamic characteristics of the shear layer and the wake topological structure are greatly affected by the added two control rods, e.g. the length of the recirculation region is shortened significantly compared with that of a single cylinder, and the lift/drag of the main cylinder is significantly increased. Through the statistical analysis of the flow field and the wake structure, the turbulence intensity in the near wake area can be observed to strengthened. From the results of the current work, it is found that the flow around the cylinder with the additional control rods produces different results from the laminar flow and single cylinder.

关 键 词：圆柱绕流 湍流 谱单元方法 控制小圆柱 

分 类 号：O351.3[理学—流体力学]