Hydrodynamic analysis of resonant waves within the gap between a vessel and a vertical quay wall
Hydrodynamic analysis of resonant waves within the gap between a vessel and a vertical quay wall
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船舶与垂直码头壁之间间隙内共振波的水动力分析
DOI：
10.1016/j.oceaneng.2022.112192
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发表时间：
2022-09
影响因子：
5
通讯作者：
Liu Yingyi
中科院分区：
文献类型：
--
作者：
Cong Peiwen;Teng Bin;Gou Ying;Tan Lei;Liu Yingyi
关于重力码头的并排卸货作业，研究了在正海和斜海中波与沿着长垂直壁的船只的相互作用。应用成像原理将原始问题转换为暴露于双向入射波的公海中两艘对称船只的等效波衍射问题。边界积分方程法与高阶边界元法（HOBEM）相结合，用于求解等效问题。除了线性自由表面高程和波浪载荷之外，还基于直接压力积分或使用半圆柱形控制面计算船舶上的二阶平均波浪漂移载荷。此外，还使用本征函数展开匹配方法开发了斜波与二维驳船壁系统相互作用的解决方案。然后分别对靠近长墙的矩形驳船和威格利船体的情况进行了系统数值研究。在倾斜入射下，可以诱发间隙内流体运动的奇数和偶数模式。对于矩形驳船，在(1, 0)共振模位置处线性波力明显放大，而在(2, 0)共振模处线性波矩明显放大。此外，在奇数和偶数共振模式下，沿横向方向的负平均力（倾向于将驳船推离壁）都会明显增强。此外，在斜海中，(1, 0)共振模式会导致驳船横截面积中心周围的正平均偏航力矩显着放大，这往往会将驳船的船尾（面向入射波）拉近船壁，同时将船头推离船壁。对于更高的模式，这种放大变得不太明显。数值结果还表明，船体几何形状对间隙中的共振波有显着影响。在威格利船体的情况下，与矩形驳船相比，自由表面响应的放大要小得多。
Concerning the side-by-side offloading operations at gravity-based terminals, the wave interaction with a vessel alongside a long vertical wall in both normal and oblique seas was investigated. The imaging principle was applied to convert the original to an equivalent wave-diffraction problem by two symmetrical vessels in open seas exposed to bi-directional incident waves. The boundary integral equation method, in conjunction with a higher-order boundary element method (HOBEM), was used to solve the equivalent problem. Besides the linear free-surface elevation and wave loads, the second-order mean wave drift loads on the vessel was calculated based on either the direct pressure integration or using a semi-cylindrical control surface. Moreover, the solution was also developed for the oblique wave interaction with a two-dimensional barge-wall system using the eigenfunction expansion matching method. Systemic numerical studies were then conducted for the cases of a rectangular barge and a Wigley hull in close proximity to a long wall, respectively. Under oblique incidence, both the odd and even modes of fluid motion within the gap can be induced. In the case of a rectangular barge, the linear wave force can be obviously amplified at the location of the (1, 0) resonant mode, while the linear wave moment at the (2, 0) mode. In addition, the negative mean force along the transverse direction, which tends to push the barge away from the wall, can be apparently enhanced at both the odd and even resonant modes. Besides, in oblique seas, the (1, 0) resonant mode can give rise to the significant amplification of the positive mean yaw moment around the centre of the cross-sectional area of the barge, which tends to pull the stern of the barge (that faces incident waves) closer to the wall, while pushing the bow away from the wall. Such amplification gets less noticeable for higher modes. Numerical results also indicate that the hull geometry imposes a significant impact on the resonant waves in the gap. In the case of a Wigley hull, the amplification of the free-surface response is much less apparent when compared with a rectangular barge.
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