Numerical Investigation of Wave Amplitude Spectra Effects On Focusing Wave Generation
Numerical Investigation of Wave Amplitude Spectra Effects On Focusing Wave Generation
复制标题
波幅谱对聚焦波产生影响的数值研究
DOI：
10.1016/j.oceaneng.2022.112550
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发表时间：
2022-12
影响因子：
5
通讯作者：
Yan SQ
中科院分区：
文献类型：
--
作者：
Xu GC;Zhou Y;Yan SQ
聚焦波常被认为是海洋中观测到的反常波或极端海况的有效模拟，用于海洋结构物设计。对产生预定聚焦波的影响因素的认识，对于数值和物理波浪水槽中预定聚焦波的产生都具有重要意义。基于QALE-FEM求解的完全非线性势场理论，数值研究了在一系列波峰高程参数和频率范围下，波在频带上的振幅分布对聚焦波产生的影响，包括聚焦波峰高程和聚焦位置。结果表明，聚焦波的波峰高程显着影响的波的振幅分布，特别是对于目标波与大波峰或那些被分配在低频域。此外，聚焦波的产生位置也通过波面的相移和波陡表示的波非线性与振幅谱有很强的相关性。
Focusing waves are often considered as an effective simulation of freak waves observed in oceans, or extreme sea states for marine structures design. The understanding of factors in generating prescribed focusing wave is of great importance for its generation in both numerical and physical wave tank. Based on the fully nonlinear potential theory solved by the QALE-FEM, this paper numerically investigates the effect of wave amplitude distribution over the frequency band under a series of the crest elevation parameters and frequency ranges on focusing wave generation, including focusing wave crest elevations and focusing positions. The results suggest that focusing wave crest elevation is significantly affected by the wave amplitude distribution especially for target waves with large wave crests or those are assigned at low frequency domain. Moreover, generation positions of focusing wave are also strongly correlated to amplitude spectra through phase shift of the wave surface and wave nonlinearity denoted by wave steepness.
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