Nonlinear analysis for ship-generated waves interaction with mooring line/riser systems
Nonlinear analysis for ship-generated waves interaction with mooring line/riser systems
复制标题
船舶产生的波浪与系泊线/立管系统相互作用的非线性分析
DOI：
10.1016/j.marstruc.2017.12.011
复制
发表时间：
2018-05-01
影响因子：
3.9
通讯作者：
Oleg, Gaidai
中科院分区：
文献类型：
--
作者：
Cheng, Yong;Ji, Chunyan;Oleg, Gaidai
提出了一种时域有限元-边界元混合方法来研究船舶波浪与细长结构之间的非线性相互作用。基于船舶稳态运动的三维位势理论对船舶波浪进行建模，并采用高阶边界元法计算速度位势。采用一种特殊的基于全局坐标的杆有限元模型，以悬链线解作为初始静剖面，对细长结构进行了精确分析。数值模型通过在有效张力公式中增加一项来考虑内部流动，同时采用非线性二次弹簧和库仑摩擦模型来分析海底支撑和摩擦效应。数值模型与已发表的船舶波浪产生和系泊缆绳/隔水管动力响应的实验和数值结果进行了验证。对多组份系泊索和深水钢悬链线立管两种细长结构在船舶波浪作用下的动力特性进行了数值模拟。在此基础上，对某桁架梁系泊索分别受船浪、风浪及二者联合作用进行了耦合分析。研究了细长结构的顶节点张力与航路、航速、船距、内部流动和海底摩擦力的关系。
A time-domain hybrid finite element-boundary element (FE-BE) method is developed to investigate nonlinear interaction between ship waves and slender structures. The ship waves are modeled in the context of the three-dimensional potential theory including ship steady state motion, and the velocity potential are computed using a higher-order boundary element method (HOBEM). A special global coordinate-based FEM rod model, when using catenary solution as an Initial static profile, is employed in the accurate analysis of slender structures. The internal flow is incorporated in the numerical model by adding a new term to the effective tension formulation while both the seabed support and friction effect are performed by using a nonlinear quadratic spring and a Coulomb friction model. The numerical model is verified with the published experimental and numerical results for the ship waves generation and dynamic responses of mooring line/riser. Numerical simulations are executed to determine the dynamic behavior of two example slender structures such as multi-component mooring line and deepwater steel catenary riser under ship waves. Then the coupled analysis program is applied for a truss Spar with its mooring lines subjected to ship waves, wind-generated waves and their combined action, respectively. The dependence of the top node tensions of the slender structures on ship path, ship speed, ship distance, internal flow and seabed friction, is also examined.