Journal of Shanghai Jiao Tong University ›› 2016, Vol. 50 ›› Issue (03): 460-464.

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A Two-Dimensional Numerical Study of Vortex Induced Motion of a Semi-Submersible with Rectangular Sections in Coupling Currents and Waves

WU Fan,XIAO Longfei,LIU Mingyue,TIAN Xinliang   

  1. (State Key Laboratory of Ocean Engineering, Shanghai Jiaotong University, Shanghai 200240, China)
  • Received:2015-03-14 Online:2016-03-28 Published:2016-03-28

Abstract: Abstract: A deep draft semisubmersible (DDS) in certain flow conditions is subjected to vortex induced motions (VIM), which significantly influences the loads and fatigue of moorings and risers. To investigate the VIM of a DDS with four rectangular columns in uniform current coupled with waves, a numerical study using CFD method was conducted. The current in a typical current of 135°was chosen by coupling with sinusoidal oscillatory flows used to simulate the waves with different KC numbers and relative current numbers were chosen. The results show that the VIM response of this kind of DDS with four rectangular columns in current with oscillatory flows is more significant than that in the current. The oscillatory flows have an important influence on the VIM response of the DDS.

Key words: Key words: deep draft semisubmersible, vortex induced motion, numerical simulations, oscillatory flow, uniform current

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