International Journal of Naval Architecture and Ocean Engineering

  • 제13권1호
  • /
  • Pages.599-616
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  • 2021
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  • 2092-6782(pISSN)
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  • 2092-6790(eISSN)
대한조선학회 (The Society of Naval Architects of Korea)
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Numerical studies on flow-induced motions of a semi-submersible with three circular columns

  • Tian, Chenling (State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University) ;
  • Liu, Mingyue (State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University) ;
  • Xiao, Longfei (State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University) ;
  • Lu, Haining (State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University) ;
  • Wang, Jin (CNOOC Research Institute Ltd.)
  • 투고 : 2020.08.31
  • 심사 : 2021.06.10
  • 발행 : 2021.11.30
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초록

The semi-submersible with three circular columns is an original concept of efficient multifunctional platform, which can be used for marginal oil, gas field, and Floater of Wind Turbines (FOWT). However, under certain flow conditions, especially in uniform current with specific velocities, the eddies will alternatively form and drop behind columns, resulting in the fluctuating lift force and drag force. Consequently, the semi-submersible will subject to the Flow-Induced Motions (FIM). Based on the Detached Eddy Simulation (DES) method, the numerical studies were carried out to understand the FIM characteristics of the three-column semi-submersible at two different parameters, i.e., current incidences (0°, 30°, and 60°-incidences) and reduced velocities (4 ≤ Ur ≤ 14). The results indicate that the lock-in range of 6 ≤ Ur ≤ 10 for the transverse motions is presented, and the largest transverse non-dimensional nominal amplitude is observed at 60°-incidence, with a value of Ay/D = 0:481. The largest yaw amplitude Ayaw is around 3.0° at 0°-incidence in the range of 8 ≤ Ur ≤ 12. The motion magnitude is basically the same as that of a four-column semi-submersible. However, smaller responses are presented compared to those of the three-column systems revealing the mitigation effect of the pontoon on FIM.

키워드

과제정보

The authors acknowledge the support of the National Natural Science Foundation of China (Grant no. 51909158), the support of the subproject of the Important National Science & Technology Specific Projects (2016ZX05028-002-004), Ministry of Industry and Information Technology of China (Project No. [2016] 23), and Open Foundation of State Key Laboratory of Ocean Engineering (Project No. 1808).

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