均匀流作用下三立柱轻型半潜式生产平台涡激运动特性数值研究
|
摘要
三立柱轻型半潜式生产平台是一种新型多功能高效平台,可广泛用于中等水深及深水边际油气田开发。但在一定的来流条件下,立柱后方会产生漩涡脱落,导致平台发生涡激运动现象,从而影响平台的海上作业。基于分离涡模拟(detached eddy simulation,简称DES)方法,对具有三立柱和深吃水特点的非传统型半潜式生产平台的涡激运动响应特性开展数值模拟研究,从运动响应幅值和频率、运动轨迹及水动力系数等多个角度分析其在不同流向角和不同折合速度下涡激运动响应的关键特征和锁定范围。研究表明,三立柱轻型半潜式生产平台的横向运动响应由其受到的脉动升力主导,在折合速度7.0≤Ur≤10.0区间内发生锁定现象,且在180°流向角时幅值达到最大,约为立柱直径的59%;首摇运动在0°流向角时达到最大响应幅值4.9°,且锁定区内的响应频率接近其首摇运动固有频率;其运动轨迹主要表现为沿着横向的直线往复运动。
The light weight semi-submersible floating production system( FPS) with three columns is an original concept of efficient multifunctional platform,firstly raised in the field of vortex-induced motions( VIM) for offshore platforms,which can be used in marginal oil & gas field in the South China Sea,where the range of water depth is from 300 to 1 000 meters. Under certain inflow conditions,eddies or vortices around columns would form and drop alternately,and generate the vortex-induced motions behaviors.Based on the methodology of detached eddy simulation( DES), the numerical studies for the vortex-induced motions of an unconventional semi-submersible FPS platform with three circular columns and deep-draft conditions were conducted. In this paper,the key characteristics for VIM from the respects of the amplitudes and frequencies of the responses are discussed,as well as the motion trajectories and hydrodynamic coefficients in different headings and reduced velocities. The results reveal that the motions in the transverse direction are driven by the fluctuating lift force acting on the platform. Moreover,the largest transverse amplitude was observed at the range of 7.0 ≤ Ur≤ 10.0,with the value of 59% of the platform diameter at 180°-incidence. Besides,the largest yaw amplitude was about 4.9° occurring at 0°-incidence. In addition,the frequency of the yaw response was in accordance with the yaw natural frequency. The linear type of the motion trajectories along the transverse direction was observed.
The light weight semi-submersible floating production system( FPS) with three columns is an original concept of efficient multifunctional platform,firstly raised in the field of vortex-induced motions( VIM) for offshore platforms,which can be used in marginal oil & gas field in the South China Sea,where the range of water depth is from 300 to 1 000 meters. Under certain inflow conditions,eddies or vortices around columns would form and drop alternately,and generate the vortex-induced motions behaviors.Based on the methodology of detached eddy simulation( DES), the numerical studies for the vortex-induced motions of an unconventional semi-submersible FPS platform with three circular columns and deep-draft conditions were conducted. In this paper,the key characteristics for VIM from the respects of the amplitudes and frequencies of the responses are discussed,as well as the motion trajectories and hydrodynamic coefficients in different headings and reduced velocities. The results reveal that the motions in the transverse direction are driven by the fluctuating lift force acting on the platform. Moreover,the largest transverse amplitude was observed at the range of 7.0 ≤ Ur≤ 10.0,with the value of 59% of the platform diameter at 180°-incidence. Besides,the largest yaw amplitude was about 4.9° occurring at 0°-incidence. In addition,the frequency of the yaw response was in accordance with the yaw natural frequency. The linear type of the motion trajectories along the transverse direction was observed.
引文
[1]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,2013.(BAI Zhining. Research on vortex induced motion of a deep draft semi-submersible platform[D]. Shanghai:Shanghai Jiao Tong University,2013.(in Chinese))
[2] WAALS O J,PHADKE A C,BULTEMA S. Flow induced motions on multi column floaters[C]∥Proceedings of the ASME2007 26th International Conference on Offshore Mechanics and Arctic Engineering. American Society of Mechanical Engineers,2007:669-678.
[3]张蕙,杨建民,肖龙飞,等.均匀流中深水系泊Truss Spar平台涡激运动试验研究[J].海洋工程,2011,29(4):14-20.(ZHANG Hui,YANG Jianmin,XIAO Longfei,et al. Experimental study of vortex-induced motions of a Truss Spar in uniform currents[J]. The Ocean Engineering,2011,29(4):14-20.(in Chinese))
[4]苏云龙,杨建民,吕海宁,等.新型多立柱式Spar平台涡激运动特性研究[J].海洋工程,2015,33(1):14-23.(SU Yunlong,YANG Jianmin,LV Haining,et al. Study on the vortex-induced motions of a new type multi-column Spar platform[J]. The Ocean Engineering,2015,33(1):14-23.(in Chinese))
[5] GONALVES R T,ROSETTI G F,FUJARRA A L C,et al. Experimental study on vortex-induced motions(VIM)of a largevolume semi-submersible platform[C]∥Proceedings of the ASME 2011 30th International Conference on Ocean,Offshore and Arctic Engineering. American Society of Mechanical Engineers,2011:1-9.
[6]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实验研究[J].船舶力学,2014,18(4):377-384.(BAI Zhining,XIAO Longfei,CHENG Zhengshun,et.al. Experimental study on vortex induced motion response of a deep draft semi-submersible platform[J]. Journal of Ship Mechanics,2014,18(4):377-384.(in Chinese))
[7] KIM J W,MAGEE A,GUAN K Y H. CFD simulation of flow-induced motions of a multi-column floating platform[C]∥Proceedings of the ASME 2011 30th International Conference on Ocean,Offshore and Arctic Engineering. American Society of Mechanical Engineers,2011:319-326.
[8]吴凡,肖龙飞,刘明月,等.矩形截面半潜式平台浪流耦合作用涡激运动响应二维数值模拟[J].上海交通大学学报,2016,50(3):460-465.(WU Fan,XIAO Longfei,LIU Mingyue,et al. 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 Jiaotong University,2016,50(3):460-465.(in Chinese))
[9] RIJKEN O. Examining the effects of scale,mass ratios and column shapes on the vortex induced motion response of a semisubmersible through CFD analyses[C]∥Proceedings of the ASME 2014 33rd International Conference on Ocean,Offshore and Arctic Engineering. American Society of Mechanical Engineers,2014:V002T08A028-V002T08A028.
[10] KIM S J,SPERNJAK D,HOLMES S,et al. Vortex-induced motion of floating structures:CFD sensitivity considerations of turbulence model and mesh refinement[C]∥Proceedings of the ASME 2015 34th International Conference on Ocean,Offshore and Arctic Engineering. American Society of Mechanical Engineers,2015:V002T08A057-V002T08A057.
[11] WANG M,WANG J,CHENG Z,et al. A new light-weight semi-submersible fps for offshore marginal oil and gas field development[C]∥Proceedings of the Sname,Offshore Syposium. 2017.
[12] BAI Y,LV H,WANG J,et al. Numerical and experimental motion investigations of a QX semi-submersible in irregular sea[C]∥Proceedings of the 27th International Ocean and Polar Engineering Conference. International Society of Offshore and Polar Engineers,2017.
[13] SMAGORINSKY J. General circulation experiments with the primitive equations:I. the basic experiment[J]. Monthly weather review,1963,91(3):99-164.
[14] ER VAN DRIEST. On turbulent flow near a wall[J]. Journal of the Aeronautical Sciences,1956,23(11):1007-1011.
[15] LIU M,XIAO L,YANG J,et al. Parametric study on the vortex-induced motions of semi-submersibles:Effect of rounded ratios of the column and pontoon[J]. Physics of Fluids,2017,29(5):139-459.
[2] WAALS O J,PHADKE A C,BULTEMA S. Flow induced motions on multi column floaters[C]∥Proceedings of the ASME2007 26th International Conference on Offshore Mechanics and Arctic Engineering. American Society of Mechanical Engineers,2007:669-678.
[3]张蕙,杨建民,肖龙飞,等.均匀流中深水系泊Truss Spar平台涡激运动试验研究[J].海洋工程,2011,29(4):14-20.(ZHANG Hui,YANG Jianmin,XIAO Longfei,et al. Experimental study of vortex-induced motions of a Truss Spar in uniform currents[J]. The Ocean Engineering,2011,29(4):14-20.(in Chinese))
[4]苏云龙,杨建民,吕海宁,等.新型多立柱式Spar平台涡激运动特性研究[J].海洋工程,2015,33(1):14-23.(SU Yunlong,YANG Jianmin,LV Haining,et al. Study on the vortex-induced motions of a new type multi-column Spar platform[J]. The Ocean Engineering,2015,33(1):14-23.(in Chinese))
[5] GONALVES R T,ROSETTI G F,FUJARRA A L C,et al. Experimental study on vortex-induced motions(VIM)of a largevolume semi-submersible platform[C]∥Proceedings of the ASME 2011 30th International Conference on Ocean,Offshore and Arctic Engineering. American Society of Mechanical Engineers,2011:1-9.
[6]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实验研究[J].船舶力学,2014,18(4):377-384.(BAI Zhining,XIAO Longfei,CHENG Zhengshun,et.al. Experimental study on vortex induced motion response of a deep draft semi-submersible platform[J]. Journal of Ship Mechanics,2014,18(4):377-384.(in Chinese))
[7] KIM J W,MAGEE A,GUAN K Y H. CFD simulation of flow-induced motions of a multi-column floating platform[C]∥Proceedings of the ASME 2011 30th International Conference on Ocean,Offshore and Arctic Engineering. American Society of Mechanical Engineers,2011:319-326.
[8]吴凡,肖龙飞,刘明月,等.矩形截面半潜式平台浪流耦合作用涡激运动响应二维数值模拟[J].上海交通大学学报,2016,50(3):460-465.(WU Fan,XIAO Longfei,LIU Mingyue,et al. 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 Jiaotong University,2016,50(3):460-465.(in Chinese))
[9] RIJKEN O. Examining the effects of scale,mass ratios and column shapes on the vortex induced motion response of a semisubmersible through CFD analyses[C]∥Proceedings of the ASME 2014 33rd International Conference on Ocean,Offshore and Arctic Engineering. American Society of Mechanical Engineers,2014:V002T08A028-V002T08A028.
[10] KIM S J,SPERNJAK D,HOLMES S,et al. Vortex-induced motion of floating structures:CFD sensitivity considerations of turbulence model and mesh refinement[C]∥Proceedings of the ASME 2015 34th International Conference on Ocean,Offshore and Arctic Engineering. American Society of Mechanical Engineers,2015:V002T08A057-V002T08A057.
[11] WANG M,WANG J,CHENG Z,et al. A new light-weight semi-submersible fps for offshore marginal oil and gas field development[C]∥Proceedings of the Sname,Offshore Syposium. 2017.
[12] BAI Y,LV H,WANG J,et al. Numerical and experimental motion investigations of a QX semi-submersible in irregular sea[C]∥Proceedings of the 27th International Ocean and Polar Engineering Conference. International Society of Offshore and Polar Engineers,2017.
[13] SMAGORINSKY J. General circulation experiments with the primitive equations:I. the basic experiment[J]. Monthly weather review,1963,91(3):99-164.
[14] ER VAN DRIEST. On turbulent flow near a wall[J]. Journal of the Aeronautical Sciences,1956,23(11):1007-1011.
[15] LIU M,XIAO L,YANG J,et al. Parametric study on the vortex-induced motions of semi-submersibles:Effect of rounded ratios of the column and pontoon[J]. Physics of Fluids,2017,29(5):139-459.