Numerical Simulation of three-dimensional flow around a circular cylinder of finite length

WANG Xiaocong; GUI Hongbin; LIU Yang

doi:10.3969/j.issn.1673-3185.2018.02.004

Volume 13 Issue 2

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WANG Xiaocong, GUI Hongbin, LIU Yang. Numerical Simulation of three-dimensional flow around a circular cylinder of finite length[J]. Chinese Journal of Ship Research, 2018, 13(2): 27-34. doi: 10.3969/j.issn.1673-3185.2018.02.004

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Numerical Simulation of three-dimensional flow around a circular cylinder of finite length

doi: 10.3969/j.issn.1673-3185.2018.02.004

School of Naval Architecture, Harbin Institute of Technology, Weihai 264209, China

Received Date: 2017-09-11
Available Online: 2018-04-11
Publish Date: 2018-04-01

Abstract

This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 International License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Objectives In this paper, in order to study the flow characteristics and mechanism of three-dimensional flow around a circular cylinder of finite length, Methods a numerical simulation using a Large Eddy Simulation (LES) and vortex structural classification technology is carried out, and the accuracy of the simulation is proven. Results When analyzing the flow field, it is found that the length of the recirculation zone is smaller for a circular cylinder of finite length. In addition, the downstream from the free end can suppress the common phenomenon of Karman-Vortex-Street which leads to a loss of drag-coefficient. Compared with the fixed wall at the bottom, the free end surface has a higher influence on the onstream-wise velocity. The 'mushroom' vortex appears in pairs and two original points exist on the free end. The circular cylinder of finite length appears to be strongly three-dimensional with a lower drag-coefficient. Moreover, there is a tip vortex behind the free end and a horseshoe vortex in the cylinder-wall junction. Conclusions The results of this paper give a relatively comprehensive description of the flow characteristics of a circular cylinder of finite length, and can provide useful references for relevant research.
- finite length,
- flow around circular cylinder,
- downstream,
- free end surface,
- Large Eddy Simulation (LES)

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References

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