Oblique focused wave group generation and interaction with a fixed FPSO-shaped body: 3D CFD simulations and comparison with experiments
Oblique focused wave group generation and interaction with a fixed FPSO-shaped body: 3D CFD simulations and comparison with experiments
复制标题
DOI：
10.1016/j.oceaneng.2019.106524
复制
发表时间：
2019-11
影响因子：
5
通讯作者：
Hao Chen;L. Qian;W. Bai;Zhihua Ma;Zaibin Lin;Mi-An Xue
中科院分区：
文献类型：
--
作者：
Hao Chen;L. Qian;W. Bai;Zhihua Ma;Zaibin Lin;Mi-An Xue
本文介绍了斜向聚焦波群的产生和相互作用的一个固定的FPSO形体的数值研究，与现有的实验数据进行了全面的验证。3D数值模型基于开源工具箱OpenFOAM®，其中使用多个虚拟分段波浪桨生成斜波。每个桨上的表面高程和速度剖面是根据蛇原理推导的，该原理模仿了物理波浪水槽中波浪桨的行为。利用该格式首次对空水槽中倾斜传播的聚焦波群进行了数值试验。通过对水面高程的分析，发现在波盆中心区域可以产生质量较好的斜向波场。此外，利用相位反转法研究了波角对波群谐波结构的影响。结果表明，虽然波角的线性和二阶谐波的影响很小，三阶谐波被改变的波角，虽然它的幅度是非常小的。最后，通过斜向聚焦波群与固定浮式生产储油船（FPSO）型体相互作用的数值模拟，验证了斜向聚焦波群数值生成方法的有效性和角度效应在波浪-结构相互作用过程中的重要性。通过比较不同波浪传播角情况下的积分波浪力，可以清楚地看出波浪入射角的影响。
This paper presents a numerical study of oblique focused wave group generation and interaction with a fixed FPSO-shaped body, with thorough validations against available experimental data. The 3D numerical model is based on the open-source toolbox OpenFOAM®, where the oblique waves are generated using multiple virtual segmented wave paddles. The surface elevation and velocity profiles on each paddle are derived based on the snake principle, which mimics the behaviour of wave paddles in the physical wave tank. Numerical tests are firstly conducted for focused wave groups propagating obliquely in an empty wave tank using the proposed scheme. By analysis of the surface elevation, it is found that reasonably good quality of oblique wave fields can be generated in the central area of the wave basin. Furthermore, investigations are carried out on the effects of wave angles on the harmonic structures of the wave groups using the phase-inversion method. It is shown that while the wave angle has minor effects on the linear and second order harmonics, the third order harmonic is altered by the wave angles, albeit its magnitude is very small. Finally, to show the effectiveness of the numerical oblique wave generation method and the importance of the angle effects in the wave-structure interaction process, simulations are carried out for the oblique focused wave group interacting with a fixed FPSO-shaped body. The effects of the wave incidence angle are clearly shown from the comparison of the integrated wave forces between the cases with different wave propagating angles.