Numerical investigations of gap resonance excited by focused transient wave groups
Numerical investigations of gap resonance excited by focused transient wave groups
复制标题
聚焦瞬态波群激发间隙共振的数值研究
DOI：
10.1016/j.oceaneng.2020.107628
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发表时间：
2020-09
影响因子：
5
通讯作者：
Zhu Yazhou
中科院分区：
文献类型：
--
作者：
Gao Junliang;Chen Hongzhou;Zang Jun;Chen Lifen;Wang Gang;Zhu Yazhou
窄间隙并排布置的两个或多个结构体可能会发生大幅度的自由面振荡，在甲板上产生绿水，导致作用在结构体上的水动力载荷急剧增大。本文利用二维数值波槽模拟了不同聚焦波幅值的聚焦瞬态波群引发的两个固定盒子狭窄间隙内自由表面的瞬态共振运动。系统地研究了双箱系统在间隙内和间隙附近的自由面放大、瞬态间隙共振的响应时间和阻尼时间、两个盒子上的最大波荷载以及高阶波荷载对一阶波荷载的相对重要性。研究发现，绿水的最脆弱位置与入射聚焦波幅值密切相关。阻尼时间随聚焦波幅值的增加而逐渐减小，而响应时间对聚焦波幅值不敏感。随着聚焦波幅值的增大，两个箱体的归一化最大波荷载总体上也呈现出逐渐下降的趋势，而高阶波荷载对一阶波荷载的相对重要性越来越显著。
Two or more structures arranged side by side with narrow gaps may be suffered from large-amplitude free-surface oscillations, which could cause green water on the deck and lead to dramatic increase of hydrodynamic loading acting on structures. Here, transient resonant motions of the free surface inside a narrow gap between two fixed boxes triggered by focused transient wave groups with various focused wave amplitudes are simulated using a two-dimensional numerical wave tank. The free-surface amplifications not only inside the gap but in the vicinity of the two-box system, the response time and the damping time of the transient gap resonance, the maximum wave loads on both boxes and the relative importance of the higher-order wave loads to the first-order ones are systematically investigated. It is found that the most vulnerable position to green water closely depends on the incident focused wave amplitude. The damping time decreases gradually with increasing focused wave amplitude, while the response time seems insensitive to the latter. As the focused wave amplitude increases, the normalized maximum wave loads on both boxes are also shown to decline gradually overall, while the relative importance of the higher-order wave loads to the first-order ones becomes more and more remarkable.
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