| 静止方柱和圆柱绕流的二维数值分析 |
| |
| 引用本文： | 毕继红,余化军,任洪鹏.静止方柱和圆柱绕流的二维数值分析[J].三峡大学学报(自然科学版),2012,34(1):41-45. |
| |
| 作者姓名： | 毕继红 余化军 任洪鹏 |
| |
| 作者单位： | 1. 天津大学建筑工程学院,天津 300072;滨海土木工程结构与安全教育部重点实验室(天津大学),天津300072
2. 天津大学建筑工程学院,天津,300072 |
| |
| 摘 要： | 运用流体计算软件CFX模拟了静止方柱和圆柱在不同雷诺数条件下（层流区、亚临界区、超临界区）的绕流问题.采用层流和SST湍流模型,基于二维纳维斯-斯托克斯方程（N-S方程）,计算得到了相应的绕流参数：斯托罗哈数St和阻力系数Cd.将绕流参数与现有文献的绕流结果进行比较,验证了该数值模拟方法的正确性.分析了雷诺数Re对绕流参数的影响,获得了方柱和圆柱的St、Cd随Re的变化规律.通过对比方柱和圆柱的绕流参数,发现较大雷诺数时方柱的斯托罗哈数远低于圆柱的斯托罗哈数,但同时其阻力系数却高于圆柱的阻力系数,而在圆柱绕流中明显存在的阻力危机现象在方柱绕流中并不明显.
|
| 关 键 词： | 边界层 阻力系数 斯托罗哈数 阻力危机 |
Two Dimensional Numerical Simulation of Flow Over a Static Square Cylinder and a Static Circular Cylinder |
| |
| Bi Jihong
,
Yu Huajun
,
Ren Hongpeng.Two Dimensional Numerical Simulation of Flow Over a Static Square Cylinder and a Static Circular Cylinder[J].Journal of China Three Gorges University(Natural Sciences),2012,34(1):41-45. |
| |
| Authors: | Bi Jihong Yu Huajun Ren Hongpeng |
| |
| Institution: | 1(1.School of Civil Engineering,Tianjin Univ.,Tianjin 300072,China;2.Key Laboratory of Coast Civil Structure Safety of Ministry of Education,Tianjin Univ.,Tianjin 300072,China) |
| |
| Abstract: | The flow over a static square cylinder and a static circular cylinder under different Reynolds number(Re)(laminar region,subcritical region,supercritical region) is simulated using CFX.The parameters of flow over a static cylinder: Strouhal number St,drag coefficient Cd are obtained with laminar and SST turbulence model based on Navier-Stokes equation.Through comparing presented results with available literature results,the correctness of this numerical simulation method is verified.The influence of Re on parameters is analyzed,and the law of St,Cd following Re is given.Comparing St,Cd of presented results of square cylinder and circular cylinder,it is found that the St of square cylinder is far lower than that of circular cylinder under higher Re,while that the Cd of the former is larger than that of the latter.Meanwhile,the obvious phenomenon of drag crisis existed in flow over a circular cylinder does not show apparently in flow over a square cylinder. |
| |
| Keywords: | boundary layer drag coefficient Strouhal number drag crisis |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
