内孤立波作用下Spar平台动力响应特性
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摘要
以三类内孤立波理论(Kd V、e Kd V和MCC)的适用性条件为依据,采用Morison和傅汝德-克雷洛夫公式分别计算Spar平台内孤立波水平力和垂向力,结合时域有限位移运动方程,建立了有限深两层流体中内孤立波与带分段式系泊索Spar平台相互作用的理论模型。以东沙群岛某海域实测内孤立波为对象,数值分析了在内孤立波作用下某经典式Spar平台的内孤立波动态载荷、运动响应及其系泊张力的变化特性。研究表明,内孤立波不仅会对Spar平台产生突发性冲击载荷,使其产生大幅度水平漂移运动,而且还会使其系泊张力显著增大。因此,在Spar平台等深海平台的设计应用中,内孤立波的影响不可忽视。
Based on the applicability conditions of three internal solitary wave theories( Kd V,e Kd V and MCC),a theoretical model for analyzing the interaction characteristics of internal solitary waves with the spar platform is presented by using coupled motion equations of the floating body in time domain,while the horizontal and vertical forces on spar platform due to internal solitary waves are calculated with Morison and Froude-Krylov formulas. The observed data near Dongsha Island is used as the characteristic parameters of internal solitary waves to simulate the variation characteristics of the dynamic loads,motion response and mooring tension for a classical spar platform. It is showed that internal solitary waves will give rise to the sudden impact loads and motion responses for spar platform,as well as remarkable tension increase in catenary mooring lines. Therefore,the influence of internal solitary waves on the dynamic behaviors of deep-sea floating structures including spar platforms cannot be neglected in their design and applications.
Based on the applicability conditions of three internal solitary wave theories( Kd V,e Kd V and MCC),a theoretical model for analyzing the interaction characteristics of internal solitary waves with the spar platform is presented by using coupled motion equations of the floating body in time domain,while the horizontal and vertical forces on spar platform due to internal solitary waves are calculated with Morison and Froude-Krylov formulas. The observed data near Dongsha Island is used as the characteristic parameters of internal solitary waves to simulate the variation characteristics of the dynamic loads,motion response and mooring tension for a classical spar platform. It is showed that internal solitary waves will give rise to the sudden impact loads and motion responses for spar platform,as well as remarkable tension increase in catenary mooring lines. Therefore,the influence of internal solitary waves on the dynamic behaviors of deep-sea floating structures including spar platforms cannot be neglected in their design and applications.
引文
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[17]黄文昊,尤云祥,王旭,等.圆柱型结构内孤立波载荷实验及其理论模型[J].力学学报,2013,45(5):1-13.(HUANG Wenhao,YOU Yunxiang,WANG Xu,et al.Internal solitary wave loads experiments and its theoretical model for a cylindrical structure[J].Chinese Journal of Theoretical and Applied Mechanics,2013,45(5):1-13.(in Chinese))
[18]CAMASSA R,CHOI W,MICHALLET H,et al.On the realm of validity of strongly nonlinear asymptotic approximations for internal waves[J].J.Fluid Mech.,2006,549:1-23.
[19]AGARWAL A K,JAIN A K.Dynamic behavior of offshore spar platforms under regular sea waves[J].Ocean Engineering,2003,30(4):487-516.
[20]CHANG M H,LLEN R C,et al.Nonlinear internal wave properties estimated with moored ADCP measurements[J].Journal of Atmospheric and Oceanic Technology,2011,28(6):802-815.
[2]方欣华,杜涛.海洋内波基础和中国海内波[M].青岛:中国海洋大学出版社,2005.(FANG Xinhua,DU Tao.Fundamentals of oceanic internal waves and internal waves in the China Seas[M].Qingdao:Ocean University of China Press,2005.(in Chinese))
[3]V VLASENKO,N STASHCHUK,C GUO,et al.Multimodal structure of baroclinic tides in the South China Sea[J].Nonlin.Processes Geophys.,2010,17:529-543.
[4]陈景辉.南海流花11-1深海油田开发工程[J].中国海洋平台,1996,11:43-45.(CHEN Jinghui.Liuhua 11-1 deep sea oil-field development project in South China Sea[J].Chin.Off.Plat.,1996,11:43-45.(in Chinese))
[5]BOLE J B,EBBESMEYER C C,ROMEA R D.Soliton currents in the South China Sea:measurements and theoretical modeling[C]//The 16th Offshore Technology Conference in Houston.Texas,USA,1994:367-376.
[6]HELFRICH K R,MELVILLE W K.Long nonlinear internal waves[J].Ann.Rev.Fluid Mech.,2006,38:395-425.
[7]黄文昊,尤云祥,王旭,等.有限深两层流体中内孤立波造波实验及其理论模型[J].物理学报,2013,62(8):084705.(HUANG Wenhao,YOU Yunxiang,WANG Xu,et al.Wave-making experiments and theoretical models for internal solitary waves in a two-layer fluid of finite depth[J].Acta Phys.Sin.,2013,62(8):084705.(in Chinese))
[8]FALTINSEN OM.Sea loads on ships and offshore structures[M].London:Cambridge University Press,1993.
[9]CHENG Y L,LI J C,LIU Y F.The induced flow field by internal solitary wave and its action on cylindrical piles in the stratified ocean[J].Recent Advances in Fluid Mechanics,Qinghua-Springer,2004,296-299.
[10]CAI S Q,LONG X M,GAN Z J.A method to estimate the forces exerted by internal solitons on cylinder piles[J].Ocean Engineering,2003,30:673-689.
[11]CAI S Q,LONG X M,WANG S G.Force and torques exerted by internal solitions in shear flows on cylinder piles[J].Applied Ocean Research,2008,30:72-77.
[12]XIE J S,JIANG Y J,YANG L G.Strongly nonlinear internal solution load on a small vertical circular cylinder in two-layer fluids[J].Applied Mathematical Modelling,2010,34:2089-2101.
[13]XIE J S,XU J X,CAI S Q.A numerical study of the load on cylindrical piles exerted by internal solitary waves[J].Journal of Fluids and Structures,2011,27:1252-1261.
[14]宋志军,勾莹,滕斌,等.内孤立波作用下Spar平台的运动响应[J].海洋学报,2010,32:12-19.(SONG Zhijun,GOU Ying,TENG Bin,et al.The motion response of a spar platform under internal solitary wave[J].Acta Oceanologica Sinica,2010,32:12-19.(in Chinese))
[15]尤云祥,李巍,胡天群,等.内孤立波中半潜平台动力响应特性[J].海洋工程,2012,30(2):1-7.(YOU Yunxiang,LI Wei,HU Tianqun,et al.Dynamic responses of a semi-submersible platform in internal solitary waves[J].The Ocean Engineering,2012,30(2)1-7.(in Chinese))
[16]尤云祥,李巍,何景异.海洋内孤立波中张力腿平台的水动力特性[J].上海交通大学学报,2010,44(1):12-17.(YOU Yunxiang,LI Wei,HE Jingyi.Hydrodynamic characteristics of tension leg platforms in ocean internal solitary waves[J].Jounal of Shanghai Jiao Tong Univ.,2010,44(1):12-17.(in Chinese))
[17]黄文昊,尤云祥,王旭,等.圆柱型结构内孤立波载荷实验及其理论模型[J].力学学报,2013,45(5):1-13.(HUANG Wenhao,YOU Yunxiang,WANG Xu,et al.Internal solitary wave loads experiments and its theoretical model for a cylindrical structure[J].Chinese Journal of Theoretical and Applied Mechanics,2013,45(5):1-13.(in Chinese))
[18]CAMASSA R,CHOI W,MICHALLET H,et al.On the realm of validity of strongly nonlinear asymptotic approximations for internal waves[J].J.Fluid Mech.,2006,549:1-23.
[19]AGARWAL A K,JAIN A K.Dynamic behavior of offshore spar platforms under regular sea waves[J].Ocean Engineering,2003,30(4):487-516.
[20]CHANG M H,LLEN R C,et al.Nonlinear internal wave properties estimated with moored ADCP measurements[J].Journal of Atmospheric and Oceanic Technology,2011,28(6):802-815.