Coupled dynamic analysis for wave interaction with a truss spar and its mooring line/riser system in time domain
Coupled dynamic analysis for wave interaction with a truss spar and its mooring line/riser system in time domain
复制标题
时域波浪与桁架梁及其系泊线/立管系统相互作用的耦合动力分析
DOI：
10.1016/j.oceaneng.2011.11.002
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发表时间：
2012
影响因子：
5
通讯作者：
Z. Shi
中科院分区：
文献类型：
--
作者：
M. Yang;B. Teng;宁德志;Z. Shi
开发了海洋结构物耦合动力分析的全时域分析程序。对于水动力载荷，发展了一种时域二阶方法。在这种方法中，泰勒级数展开的物体表面和自由表面的边界条件，然后使用Stokes摄动程序建立相应的边值问题与时间无关的边界。一个高阶边界元法（HOBEM）的发展，以计算在每个时间步长的所得流场的速度势。自由面边界条件采用四阶Adams-Bashforth-Moultn方法满足到二阶。在自由面上设置人工阻尼层，以避免波浪反射。系泊线/钢筋束/立管动力学基于杆理论和有限元法（FEM），控制方程在全局坐标系中描述。在耦合动力学分析中，采用Newmark法同时求解了船体的运动方程和系缆/索/索的动力学方程。应用耦合分析程序对桁架Spar平台进行了运动响应仿真。给出了系缆/锚顶运动和张力的数值计算结果，并得出了一些有意义的结论。
A full time-domain analysis program is developed for the coupled dynamic analysis of offshore structures. For the hydrodynamic loads, a time domain second order method is developed. In this approach, Taylor series expansions are applied to the body surface and free-surface boundary conditions, and the Stokes perturbation procedure is then used to establish the corresponding boundary value problems with time-independent boundaries. A higher-order boundary element method (HOBEM) is developed to calculate the velocity potential of the resulting flow field at each time step. The free-surface boundary condition is satisfied to the second order by fourth order Adams–Bashforth–Moultn method. An artificial damping layer is adopted on the free surface to avoid the wave reflection. The mooring-line/tendon/riser dynamics are based on the rod theory and the finite element method (FEM), with the governing equations described in a global coordinate system. In the coupled dynamic analysis, the motion equation for the hull and dynamic equations for mooring-lines/tendons/risers are solved simultaneously using the Newmark method. The coupled analysis program is applied for a truss Spar motion response simulation. Numerical results including motions and tensions at the top of mooring-lines/risers are presented, and some significant conclusions are derived.
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