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

Abstract

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

CLC Number:

P 751

WU Fan, XIAO Longfei, LIU Mingyue, TIAN Xinliang. A Two-Dimensional Numerical Study of Vortex Induced Motion of a Semi-Submersible with Rectangular Sections in Coupling Currents and Waves[J]. Journal of Shanghai Jiao Tong University, 2016, 50(03): 460-464.

References

［1］RODDIER D, FINNIGAN T, LIAPIS S. Influence of the Reynolds number on Spar Vortex Induced Motions (VIM): multiple scale model test comparisons ［C］//Proceeding of the ASME 28th International Conference on Ocean, Offshore and Arctic Engineering. Honolulu, Hawaii: OMAE, 200979991. ［2］MAGEE A, SHEIKH R, GUAN K Y H, et al. Model tests for VIM of multicolumn floating platforms ［C］//Proceeding of the ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. Rotterdam, The Netherlands. OMAE2011:49151. ［3］KIN J W, MAGEE A, GUAN K Y H. CFD simulation of flowinduced motions of a multicolumn floating platform ［C］//Proceeding of the ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. Rotterdam, The Netherlands: OMAE, 2011:49437. ［4］GONCALVES R T, ROSETTI G F, FUJARRA A L C, et al. Experimental study on VortexInduced Motions (VIM) of a largevolume semisubmersible platform［C］//Proceeding of the ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engeering. Rotterdam, The Netherlands: OMAE, 2011:49010. ［5］GONCALVES R T, ROSETTI G F, FUJARRA A L C, et al. Waves effects on vortexinduced motion (VIM) of a largevolume semisubmersible platform［C］//Proceeding of the ASME 2012 31th International Conference on Ocean, Offshore and Arctic Engeering. Rio de Janeiro. Brazil: OMAE, 2012:83017. ［6］赖志萌，肖龙飞，寇雨丰，等.新概念深水半潜式生产平台水动力截断试验与数值计算［J］.上海交通大学学报，2013,47:2: 712. LAI Zhimeng, XIAO Longfei, KOU Yufeng, et al. Truncated model test and numerical simulation on hydrodynamics of a new concept semisubmersible platform［J］. Journal of Shanghai Jiaotong University, 2013, 47(2): 712. ［7］白治宁，肖龙飞，程正顺，等.深吃水半潜式平台涡激运动响应模型试验研究［J］. 船舶力学，2014，18(4):377384. BAI Zhining, XIAO Longfei, CHENG Zhengshun, et al. Experimental study on vortex induced motion respose of a deep draft semisubmersible platform［J］. Journal of Ship Mechanics, 2014, 18(4): 377384. ［8］YOKUDA S, RAMAPRIAN B R. The dynamic of flow around a cylinder at subcritical Reynolds number ［J］. Phys Fluids, 1999,A12(2): 784791. ［9］白治宁.深吃水半潜式平台涡激运动响应特性研究［D］.上海：上海交通大学船舶海洋与建筑工程学院，2013. ［10］SAYERS A T. Vortex shedding from groups of three and four equispaced cylinders situated in crossflow［J］. Journal of Wond Engineering and Industrial Aerodynamics, 1990, 34(2): 21322.

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