Accurate modeling of the interaction of constrained floating structures and complex free surfaces using a new quasistatic mooring model,International Journal for Numerical Methods in Fluids

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Accurate modeling of the interaction of constrained floating structures and complex free surfaces using a new quasistatic mooring model
International Journal for Numerical Methods in Fluids ( IF 1.7 ) Pub Date : 2020-07-18 , DOI: 10.1002/fld.4894
Tobias Martin ₁ , Arun Kamath ₁ , Hans Bihs ₁

Affiliation

A new approach for the coupled simulation of moored floating structures in a numerical wave tank using CFD is subject of this article. A quasistatic mooring model is derived by dividing the cable into finite elements and solve force equilibria in each time step. A successive approximation is applied to solve the problem most efficiently. Here, the unknown internal and external forces are separated, and the system is corrected iteratively using the intermediate results for the unit vectors until convergence is reached. An improved algorithm based on the directional ghost‐cell immersed boundary method is utilized for modeling floating objects in a three‐dimensional numerical wave tank. It is based on an implicit representation of the body on a stationary grid using a level set function. The motion of the rigid body is described using Euler parameters and Hamiltonian mechanics. Dynamic boundary conditions are enforced by modifying the ghost points in the vicinity of the structure. A special procedure for staggered grids is included in the article. The mooring model is coupled to the fluid‐structure interaction solver to simulate physically constrained floating bodies in waves. Several validation cases provide an overview of the accuracy of the mooring model and the floating algorithm. In addition, the comparison of the numerical results for the motion of a moored floating barge in regular waves with experiments is presented.

中文翻译：

使用新的准静态系泊模型对受约束的浮动结构与复杂的自由表面的相互作用进行精确建模

本文讨论了一种使用CFD耦合模拟数值波箱中的浮体结构的新方法。通过将电缆分成有限元并在每个时间步求解力平衡，可以得出准静态的系泊模型。应用逐次逼近法最有效地解决问题。在此，未知的内力和外力被分开，并且使用单位矢量的中间结果迭代地校正系统，直到达到收敛为止。基于方向幻影细胞浸入边界方法的改进算法被用于对三维数值波箱中的漂浮物建模。它基于使用级别设置功能在固定网格上隐式表示的身体。使用欧拉参数和哈密顿力学来描述刚体的运动。动态边界条件通过修改结构附近的重影点来强制执行。本文包含交错网格的特殊过程。系泊模型与流固耦合求解器耦合，以模拟波浪中受物理约束的浮体。几个验证案例概述了系泊模型和浮动算法的准确性。另外，还给出了系泊浮船在规则波浪中运动的数值结果与实验的比较。系泊模型与流固耦合求解器耦合，以模拟波浪中受物理约束的浮体。几个验证案例概述了系泊模型和浮动算法的准确性。另外，还给出了系泊浮船在规则波浪中运动的数值结果与实验的比较。系泊模型与流固耦合求解器耦合，以模拟波浪中受物理约束的浮体。几个验证案例概述了系泊模型和浮动算法的准确性。另外，还给出了系泊浮船在规则波浪中运动的数值结果与实验的比较。

更新日期：2020-07-18

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