带自由液面有限长圆柱绕流数值模拟

陈松涛; 赵伟文; 万德成; 高洋洋

doi:10.19693/j.issn.1673-3185.02274

带自由液面有限长圆柱绕流数值模拟

doi: 10.19693/j.issn.1673-3185.02274

陈松涛^{1, 2,},
赵伟文^{1, 2,},
万德成^{1, 2, 3, ,},
高洋洋^3,

1.
上海交通大学船海计算水动力学研究中心，上海 200240
2.
上海交通大学船舶海洋与建筑工程学院，上海 200240
3.
浙江大学海洋学院，浙江舟山 316021

基金项目: 国家自然科学基金资助项目 (51879159, 52131102, 51909160)；国家重点研发计划资助项目(2019YFB1704200)

详细信息

作者简介:
陈松涛，男，1997年生，博士生。研究方向：海洋平台涡激运动，两相流数值模拟。E-mail：songtao.chen@sjtu.edu.cn

赵伟文，男，1990年生，博士，助理研究员。研究方向：高雷诺数流动，自由面流动数值方法，涡激运动数值模拟。E-mail：weiwen.zhao@sjtu.edu.cn

万德成，男，1967年生，博士，教授。研究方向：船海计算水动力学，高性能计算，CFD和CAE软件研发。E-mail：dcwan@sjtu.edu.cn

高洋洋，女，1987年生，副教授。研究方向：海洋工程水动力学研究。Email：yygao@zju.edu.cn

通信作者:
万德成

中图分类号: U661.1
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出版历程
- 收稿日期: 2021-01-21
- 修回日期: 2021-03-09
- 网络出版日期: 2022-02-17
- 刊出日期: 2022-03-02

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

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

带自由液面有限长圆柱绕流数值模拟由陈松涛，等创作，采用知识共享署名4.0国际许可协议进行许可。

摘要

摘要: 目的为了探究自由液面及自由端对典型钝体绕流问题的影响，对带自由液面的有限长圆柱绕流进行研究。方法基于延时分离涡模拟（DDES）技术和分段线性界面重构（PLIC）方法，利用自主开发的naoe-FOAM-SJTU求解器开展数值模拟。结果结果显示，自由液面和自由端的存在增大了局部位置的升、阻力，推迟了圆柱表面流动分离的发生；相较于深吃水位置，自由液面附近流向的速度“恢复”延缓，横向的速度呈向外运动的趋势；自由液面的变形产生了大量细碎的漩涡，自由端的卷拧状漩涡在一定程度上抑制了卡门涡街的发展。结论研究表明，目前采用的数值方法能够准确捕捉复杂流场，同时，自由液面和自由端的存在将显著改变流场沿吃水方向的分布。
- 自由液面 /
- 有限长圆柱 /
- 延时分离涡模拟 /
- 分段线性界面重构
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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图 1 分段线性界面重构方法二维示意图

Figure 1. Two-dimensional diagram of PLIC method

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图 2 计算域

Figure 2. Computational domain

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图 3 计算网格

Figure 3. Computational grids

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图 4 平均自由液面抬升剖线图

Figure 4. Profiles of the time-averaged free surface elevation

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图 5 平均自由液面等高线图

Figure 5. Contour lines of the time-averaged free surface elevation

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图 6 平均阻力系数曲线

Figure 6. Profile of the time-averaged drag coefficient

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图 7 升力系数均方根曲线

Figure 7. Root-mean-square profile of the lift coefficient

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图 8 不同深度阻力系数时历曲线

Figure 8. Time histories of drag coefficient at different depths

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图 9 不同深度升力系数时历曲线

Figure 9. Time histories of lift coefficient at different depths

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图 10 圆柱表面时均压力系数图

Figure 10. Time-averaged pressure coefficients of cylinder surface

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图 11 x-z平面时均流向速度图

Figure 11. Time-averaged streamwise velocity on x-z plane

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图 12 时均速度剖面曲线

Figure 12. Profiles of the time-averaged velocity

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图 13 时均速度梯度曲线

Figure 13. Profiles of the time-averaged velocity gradient

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图 14 时均压力系数曲线

Figure 14. Time-averaged pressure coefficient profiles

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图 15 瞬时垂直涡量云图

Figure 15. Instantaneous vertical vorticity

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图 16 瞬时涡结构

Figure 16. Instantaneous vortical structure

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