| Research on the Effects of in-Line Oscillatory Flow on the Vortex-Induced Motions of A Deep Draft Semi-Submersible in Currents |
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| 作者姓名： | WU Fan XIAO Long-fei LIU Ming-yue TIAN Xin-liang |
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| 作者单位： | The State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China,The State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China,The State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China,The State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China |
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| 基金项目： | The work was financially supported by the National Natural Science Foundation of China (Grant No. 51279104) and a Research Project on High-Technology Ships by the Ministry of Industry and Information Technology. |
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| 摘 要： | A Deep Draft Semi-submersible (DDS) under certain flow conditions could be subjected to Vortex-Induced Motions (VIM), which significantly influences the loads on and life fatigue of the moorings and the risers. To investigate the VIM of a DDS with four rectangular section columns in waves coupled with a uniform current, a numerical study using the computational fluid dynamics (CFD) method was conducted. The issues of the VIM of multi-column floaters can be conveniently converted to the issues of oscillating cylinders in fluid cross flows. This paper looks into the CFD numerical simulation of infinite cylinders having rectangular sections in a two-dimensional sinusoidal time-dependent flow field coupled with a uniform current. The resulted hydrodynamic forces and motion responses in different oscillatory flows plus currents both aligned in the same direction for the incidence of 135° of the DDS relative to the flow are compared with the ones in current only cases. The results show that the VIM response of this geometric arrangement of a DDS with four rectangular columns in a current combined with oscillatory flows is more evident than that in the current only case. The oscillatory flows and waves have the significant influence on the VIM response, forces and trajectory, in-plane motions of the DDS.
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| 关 键 词： | Vortex-Induced Motion (VIM) deep draft semi-submersible numerical simulation oscillatory flow uniform current |
| 收稿时间： | 2015/3/25 0:00:00 |
| 修稿时间： | 2015/6/8 0:00:00 |
Research on the Effects of in-Line Oscillatory Flow on the Vortex-Induced Motions of A Deep Draft Semi-Submersible in Currents |
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| WU Fan,XIAO Long-fei,LIU Ming-yue,TIAN Xin-liang.Research on the Effects of in-Line Oscillatory Flow on the Vortex-Induced Motions of A Deep Draft Semi-Submersible in Currents[J].Ocean Engineering,2017,31(3):272-283. |
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| Authors: | WU Fan XIAO Long-fei LIU Ming-yue and TIAN Xin-liang |
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| Institution: | The State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China,The State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China,The State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China and The State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China |
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| Abstract: | A Deep Draft Semi-submersible (DDS) under certain flow conditions could be subjected to Vortex-Induced Motions (VIM), which significantly influences the loads on and life fatigue of the moorings and the risers. To investigate the VIM of a DDS with four rectangular section columns in waves coupled with a uniform current, a numerical study using the computational fluid dynamics (CFD) method was conducted. The issues of the VIM of multi-column floaters can be conveniently converted to the issues of oscillating cylinders in fluid cross flows. This paper looks into the CFD numerical simulation of infinite cylinders having rectangular sections in a two-dimensional sinusoidal time-dependent flow field coupled with a uniform current. The resulted hydrodynamic forces and motion responses in different oscillatory flows plus currents both aligned in the same direction for the incidence of 135° of the DDS relative to the flow are compared with the ones in current only cases. The results show that the VIM response of this geometric arrangement of a DDS with four rectangular columns in a current combined with oscillatory flows is more evident than that in the current only case. The oscillatory flows and waves have the significant influence on the VIM response, forces and trajectory, in-plane motions of the DDS. |
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| Keywords: | Vortex-Induced Motion (VIM) deep draft semi-submersible numerical simulation oscillatory flow uniform current |
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