一种模拟特定畸形波列的相位调制方法（英文）

A Phase Modification Methodology in Modelling Deterministic Freak Wave Train

海洋中畸形波能够给船舶与海洋结构物带来巨大危害。准确地模拟特定畸形波列是研究其与结构物相互作用的基础。文章基于商业计算流体动力学软件FLUENT建立了一个数值波浪水池。通过线性聚焦方法给定一个畸形波时历,采用傅里叶分析来求解畸形波时历中每一个组成波的波幅和相位,提出了一种相位调制方法来提高模拟精度。将数值结果与物理水槽试验进行了对比,证明该相位调制方法能够显著提高数值模拟精度,展现了研究畸形波与结构物相互作用问题的新前景。

Freak waves,which are heated and debated in oceanic community,can pose serious damages to ships and offshore structures.Accurate simulation of the deterministic freak wave trains will be a basis for understanding wave-structure interactions.In this study,a numerical wave tank(NWT)is developed based on commercial computational fluid dynamics(CFD)software package-FLUENT.A freak wave train is given through linear superposition method.Fourier series expansion is applied to determine the amplitude and the initial phase of each wave frequency component.A phase modification methodology(PMM),by modifying the initial phases,is used to improve the numerical simulation quality.This method was validated against an elaborated experiment.It proves that the PMM can significantly improve the numerical results,which might show a new perspective in the wave-structure interaction problems.