Numerical Study on Modelling and Local Characteristics of a Predetermined Freak Wave

IF 1.3 4区工程技术 Q3 ENGINEERING, MECHANICAL

Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme Pub Date : 2023-05-04 DOI:10.1115/1.4062474

Yanfei Deng, Cuizhi Zhu, Zixuan Wang

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引用次数: 0

Abstract

A numerical study on the modeling and local characteristics of a predetermined freak wave has been conducted with the computational fluid dynamics (CFD) method. Following the available experimental investigations, a numerical wave tank (NWT) was accordingly set up based on OpenFOAM source packets. The experimental flap-type wave-maker motion was employed directly to reproduce a specific freak wave. The effects of the mesh scheme on freak wave modeling were investigated in depth. Reasonable agreements were achieved between the numerical and experimental results. The wavelet transform method was applied to demonstrate the energy structures of freak wave trains. Special attention was paid to the particle velocities as well as the dynamic pressure. The results showed that insufficient mesh resolutions could probably result in energy dissipations and phase errors of high-frequency wave components during wave propagations, which in turn lead to shifts in the focal positions of freak waves. The particle velocities near the wave crest are extremely large, indicating possible severe wave breaking and impact loads. The theoretical values of similar-shape regular waves could considerably underestimate the particle velocities of freak waves.

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一种预定Freak波的建模和局部特性的数值研究

用计算流体力学方法对一个预定的反常波的建模和局部特性进行了数值研究。根据现有的实验研究，基于OpenFOAM源数据包相应地建立了数值波浪槽（NWT）。实验襟翼式造波器运动直接用于再现特定的畸形波。深入研究了网格格式对畸形波建模的影响。数值结果与实验结果之间取得了合理的一致性。应用小波变换方法对奇异波列的能量结构进行了分析。特别注意颗粒的速度以及动态压力。结果表明，网格分辨率不足可能会导致波传播过程中高频波分量的能量耗散和相位误差，进而导致反常波的焦点位置发生偏移。波峰附近的颗粒速度非常大，表明可能存在严重的波浪破碎和冲击载荷。相似形状的规则波的理论值可能大大低估了反常波的粒子速度。

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来源期刊

Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme 工程技术-工程：大洋

CiteScore

4.20

自引率

6.20%

发文量

审稿时长

6-12 weeks

期刊介绍： The Journal of Offshore Mechanics and Arctic Engineering is an international resource for original peer-reviewed research that advances the state of knowledge on all aspects of analysis, design, and technology development in ocean, offshore, arctic, and related fields. Its main goals are to provide a forum for timely and in-depth exchanges of scientific and technical information among researchers and engineers. It emphasizes fundamental research and development studies as well as review articles that offer either retrospective perspectives on well-established topics or exposures to innovative or novel developments. Case histories are not encouraged. The journal also documents significant developments in related fields and major accomplishments of renowned scientists by programming themed issues to record such events. Scope: Offshore Mechanics, Drilling Technology, Fixed and Floating Production Systems; Ocean Engineering, Hydrodynamics, and Ship Motions; Ocean Climate Statistics, Storms, Extremes, and Hurricanes; Structural Mechanics; Safety, Reliability, Risk Assessment, and Uncertainty Quantification; Riser Mechanics, Cable and Mooring Dynamics, Pipeline and Subsea Technology; Materials Engineering, Fatigue, Fracture, Welding Technology, Non-destructive Testing, Inspection Technologies, Corrosion Protection and Control; Fluid-structure Interaction, Computational Fluid Dynamics, Flow and Vortex-Induced Vibrations; Marine and Offshore Geotechnics, Soil Mechanics, Soil-pipeline Interaction; Ocean Renewable Energy; Ocean Space Utilization and Aquaculture Engineering; Petroleum Technology; Polar and Arctic Science and Technology, Ice Mechanics, Arctic Drilling and Exploration, Arctic Structures, Ice-structure and Ship Interaction, Permafrost Engineering, Arctic and Thermal Design.