Numerical simulation of flows around a finite-length cylinder with free surface

CHEN Songtao; ZHAO Weiwen; WAN Decheng; GAO Yangyang

doi:10.19693/j.issn.1673-3185.02274

Volume 17 Issue 1

Mar. 2022

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Article Navigation > Chinese Journal of Ship Research > 2022 > 17(1): 91-98

CHEN S T, ZHAO W W, WAN D C, et al. Numerical simulation of flows around a finite-length cylinder with free surface[J]. Chinese Journal of Ship Research, 2022, 17(1): 91–98 doi: 10.19693/j.issn.1673-3185.02274

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Numerical simulation of flows around a finite-length cylinder with free surface

doi: 10.19693/j.issn.1673-3185.02274

CHEN Songtao^{1, 2
,},
ZHAO Weiwen^{1, 2
,},
WAN Decheng^{1, 2, 3
,
,},
GAO Yangyang^3
,

1.
Computational Marine Hydrodynamics Laboratory, Shanghai Jiao Tong University, Shanghai 200240, China
2.
School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
3.
Ocean College, Zhejiang University, Zhoushan 316021, China

More Information

Corresponding author: dcwan@sjtu.edu.cn
Received Date: 2021-01-21
Rev Recd Date: 2021-03-09

Available Online: 2022-02-17

Publish Date: 2022-03-02

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 order to explore the influence of the free surface and free end on the flow field around typical bluff bodies, the flow field around a finite-length cylinder with a free surface is studied. Methods Based on the delay detached-eddy simulation (DDES) approach and piecewise linear interface calculation (PLIC) method, our in-house solver naoe-FOAM-SJTU is adopted to carry out numerical simulations. Results The results show that the existence of the free surface and free end increases the lift and drag of local positions, and delays the occurrence of flow separation on the cylinder's surface. Compared with the deep draft region, the recovery of streamwise velocity near the free surface is delayed, and the transverse velocity tends to move outward. The deformation of the free surface generates many small vortices, and the twisted vortex at the free end restrains the development of the Kármán vortex street to a certain extent. Conclusions This study shows that the current numerical methods can accurately capture this complex flow field. At the same time, the existence of the free surface and free end significantly changes the distribution of the flow field in the draft direction.
- free surface,
- finite-length cylinder,
- delay detached-eddy simulation (DDES),
- piecewise linear interface calculation (PLIC)

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References(22)

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