基于CFD流固耦合理论的海上浮式结构物水动力性能分析

文章利用流体动力学控制方程和结构运动方程的耦合理论,在具有造消波功能的2D数值水槽中实现了海上浮式结构物在波浪中运动过程的数值模拟。以系泊式浮式方箱防波堤作为工程应用实例,分别采用梯形法和二、三阶单步数值迭代法对浮体的动力特性进行数值分析,并与基于势流理论的边界元法的结果做对比,分析后发现在波浪条件下梯形法和二、三阶单步法的计算精度相当,结果收敛,且与边界元法结果吻合较好,满足要求。该文提出了一种新的全自由度分块结构移动网格技术,实现了浮体所有方向的联合运动,而且网格不发生任何扭曲现象,计算时间、网格划分和精度要求都得到了较好的控制。

Hydrodynamic performance of the floating body based on CFD fluid-body interaction theory

Using fluid-body interaction mechanics, the motion proceeds of a floating body was numerically simulated in regular wave, which was implemented in a wave making and absorbing numerical flume. As the application case of a box-type floating breakwater with mooring systems, dynamic characteristics of the floating body among the trapezoid, 2, 3order single step method and BEM based on potential flow theory were compared. The results indicate that the trapezoid and 2, 3order single step method which were in good agreement with the BEM results has prospective accuracy and convergence in regular wave. This paper pro-posed an new technique of dynamic mesh with full 2D-3 degrees of freedom multiply structured grids, which realized the joint movement of all directions, and made sure that grids had not any distortion. The computation time, precision and meshing remained fairly well-contained.