| Hydrodynamics of the Semi-Immersed Cylinder by Forced Oscillation Model Testing |
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| 作者姓名： | SONG Chun-hui FU Shi-xiao TANG Xiao-ying HU Ke MA Lei-xin REN Tong-xin |
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| 作者单位： | State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China,State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China,School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China,Tianjin Research Institute for Water Transport Engineering, Tianjin 300000, China,Massachusetts Institute of Technology, Cambridge, MA 02139, USA,State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China |
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| 基金项目： | This work was financially supported by the SINTEF Fisheries and Aquaculture of Norway and the National Natural Science Foundation of China (Grant No. 51490674). |
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| 摘 要： | In this paper, the hydrodynamic coefficients of a horizontal semi-immersed cylinder in steady current and oscillatory flow combining with constant current are obtained via forced oscillation experiments in a towing tank. Three non-dimensional parameters (Re, KC and Fr) are introduced to investigate their effects on the hydrodynamic coefficients. The experimental results show that overtopping is evident and dominates when the Reynolds number exceeds 5×105 in the experiment. Under steady current condition, overtopping increases the drag coefficient significantly at high Reynolds numbers. Under oscillatory flow with constant current condition, the added mass coefficient can even reach a maximum value about 3.5 due to overtopping while the influence of overtopping on the drag coefficient is minor.
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| 关 键 词： | semi-immersed cylinder hydrodynamic coefficient forced oscillation experiment overtopping |
| 收稿时间： | 2016/8/22 0:00:00 |
| 修稿时间： | 2017/4/14 0:00:00 |
Hydrodynamics of the Semi-Immersed Cylinder by Forced Oscillation Model Testing |
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| SONG Chun-hui,FU Shi-xiao,TANG Xiao-ying,HU Ke,MA Lei-xin,REN Tong-xin.Hydrodynamics of the Semi-Immersed Cylinder by Forced Oscillation Model Testing[J].Ocean Engineering,2018,32(1):110-116. |
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| Authors: | SONG Chun-hui FU Shi-xiao TANG Xiao-ying HU Ke MA Lei-xin and REN Tong-xin |
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| Institution: | State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China,State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China,School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China,Tianjin Research Institute for Water Transport Engineering, Tianjin 300000, China,Massachusetts Institute of Technology, Cambridge, MA 02139, USA and State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China |
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| Abstract: | In this paper, the hydrodynamic coefficients of a horizontal semi-immersed cylinder in steady current and oscillatory flow combining with constant current are obtained via forced oscillation experiments in a towing tank. Three non-dimensional parameters (Re, KC and Fr) are introduced to investigate their effects on the hydrodynamic coefficients. The experimental results show that overtopping is evident and dominates when the Reynolds number exceeds 5×105 in the experiment. Under steady current condition, overtopping increases the drag coefficient significantly at high Reynolds numbers. Under oscillatory flow with constant current condition, the added mass coefficient can even reach a maximum value about 3.5 due to overtopping while the influence of overtopping on the drag coefficient is minor. |
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| Keywords: | semi-immersed cylinder hydrodynamic coefficient forced oscillation experiment overtopping |
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