于定勇,赵建豪,黄东燕,钟延超.不同倒角半径柱体绕流数值模拟及水动力特性分析[J].海洋工程,2018,36(5):1~11
不同倒角半径柱体绕流数值模拟及水动力特性分析
Numerical simulation of flow past a cylinder with different rounded radius and analysis of hydrodynamic characteristics
  
DOI:10.16483/j.issn.1005-9865.2018.05.001
中文关键词:  倒角半径  绕流  大涡模拟  时均流场  涡脱落形态
英文关键词:rounded radius  flow around cylinder  large eddy simulation  time averaged flow field  vortex shedding
基金项目:国家自然科学基金项目(51739010)
作者单位E-mail
于定勇 中国海洋大学 工程学院山东 青岛 266100 dyyu01@126.com 
赵建豪 中国海洋大学 工程学院山东 青岛 266100  
黄东燕 中国海洋大学 工程学院山东 青岛 266100  
钟延超 中国海洋大学 工程学院山东 青岛 266100  
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中文摘要:
      为研究倒角半径变化对柱体绕流水动力特性的影响,本文使用Fluent软件,采用大涡模拟对雷诺数Re=3 900下的6种不同倒角半径的三维柱体进行了研究。在模型验证基础上,分析了由方柱渐变到圆柱过程中后方流场速度的时均特性及瞬时涡脱落变化规律,给出了不同倒角半径下的升、阻力系数值及量纲涡脱频率St数。分析结果表明:平均阻力系数随倒角半径的增加而降低,在倒角半径为0.2D时下降速率最大,相较方柱降幅达到50%;升力系数均方根在倒角半径为0.1D~0.2D时变化最显著,减小约93%;St数随倒角半径增加而增大,在倒角半径为0.4D时可达到最大值;回流区长度随倒角半径的增加呈先增大后减小的趋势,其长度在倒角半径为0.2D时达到最大;尾涡宽度在倒角半径为0.0D最大,后随倒角半径增加逐渐下降,且当倒角半径大于0.2D以后变化不大。本文研究结果可为柱体绕流研究及相关工程应用提供参考。
英文摘要:
      In order to study the influence of the change of rounded radius on the dynamic characteristics of the flow around the cylinder, by using Fluent software and the method of Large Eddy, we simulated the three dimensional flow around cylinder with 6 different rounded radius under the Reynolds number of 3 900. Based on the model verification, the time averaged characteristics of the velocity field at the rear and the characteristic of the instantaneous vortex shedding were analyzed. Besides, lift coefficient, drag coefficient and St number were given when the cylinder changed to square column. The results show that with the increase of the rounded radius, the average drag force decreases, especially at 0.2D, when the drag force decreases by 50% relative to the square. The root mean square lift coefficient decreases most significantly from 0.1D to 0.2D, during which the reduction was made by near 93%. The St numbers increase with the increase of the rounded radius, and reach the maximum at 0.4D. The length of the reflow zone increases at first and reaches the longest length when the rounded radius is 0.2D, but decreases after then. Tail vortex width reaches the highest at 0.0D and gradually decreases then, but changes slowly after the rounded radius of 0.2D. This paper would provide a reference for the research on the flow around the cylinder and related engineering application.
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