An improved technique to generate rogue waves in random sea
An improved technique to generate rogue waves in random sea
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DOI：
10.3970/cmes.2015.106.263
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发表时间：
2015
影响因子：
2.4
通讯作者：
Jinghua Wang;S. Yan;Q. Ma
中科院分区：
文献类型：
--
作者：
Jinghua Wang;S. Yan;Q. Ma
基于Kribel和Alsina（2000）提出的方法，提出了一种改进的生成随机海浪中的异常波的方法。在该方法中，一部分波能通过时空聚焦的方法被聚焦，产生一个极端的瞬态波，而其余的波能则表现为随机的。通过引入一个校正项，改进的技术消除numerical.ly现有方法中光谱的虚假波动。利用二阶波动理论和现有的两种数值方法，对修正的各种影响进行了数值研究。基于完全非线性位势理论（FNPT）的方法，包括改进的谱边界积分（SBI）方法和拟任意拉格朗日-欧拉有限元（QALE-FEM）方法。主要讨论（1）修正对保持指定波谱特征的有效性;（2）修正对最大波高概率的影响。
This paper presents an improved technique to generate rogue (freak) waves embedded in random sea based on the approach proposed by Kribel and Alsina (2000). In this method, a part of the wave energy is focused using the temporal-spatial focusing approach to generate an extreme transient wave and the rest behaves randomly. By introducing a correction term, the improved technique removes the numerical.ly spurious fluctuations of the spectra in the existing approach. Various effects of the correction are investigated numerically by using the second-order wave theory and two existing numerical. methods based on the fully nonlinear potential theory (FNPT), including the improved Spectral Boundary Integral (SBI) method and the Quasi Arbitrary Lagrangian-Eulerian Finite Element Method (QALE-FEM). The discussions are mainly focused on (1) the effectiveness of the correction on retaining the features of the specified wave spectrum; and (2) the effects of the correction on the probability of the maximum wave heights.