Numerical Simulation of Freak Waves in Random Sea State
Numerical Simulation of Freak Waves in Random Sea State
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DOI：
10.1016/j.proeng.2015.08.300
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Weida Xia;Yuxiang Ma;G. Dong
中科院分区：
文献类型：
--
作者：
Weida Xia;Yuxiang Ma;G. Dong
采用非线性四阶Schrödinger方程模拟了以JONSWAP谱为特征的二维随机海况中异常波的产生。分析了深水异常波的演化过程。研究了初始波参数对峰度和异常波发生的影响。结果表明，本雅明-费尔指数（BFI）是判别是否存在不稳定性的重要参数。峰度随异常波发生概率呈相似的空间演化趋势。在随机海况下，谱窄、显著波高值小的异常浪更容易发生。
The generation of freak waves in a 2-dimensional random sea state characterized by the JONSWAP spectrum are simulated employing a nonlinear fourth-order Schrödinger equation. The evolution of the freak waves in deep water are analyzed. We investigate the effect of initial wave parameters on kurtosis and occurrence of freak waves. The results show that Benjamin-Feir index (BFI) is an important parameter to identify the presence of instability. The kurtosis presents a similar spatial evolution trend with the occurrence probability of freak waves. Freak waves in a random sea state are more likely to occur for narrow spectrum and small values of significant wave height.