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A numerical study on local characteristics of predetermined irregular wave trains

机译：预定不规则波列局部特征的数值研究

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摘要

In actual sea states, damage to offshore floating structures is usually caused by a few extreme waves or wave groups in an irregular wave train. Accurate simulation of the irregular wave trains can lay a solid foundation for understanding the local flow field and impact loads that would potentially cause such damage. This paper describes how the generation of a single extreme wave was investigated. Determination of the wave-maker motion for generating specified irregular wave trains is the key to this work. First, an experimental irregular wave train was decomposed into a certain number of small-amplitude waves. Fourier series expansion was performed to determine the amplitude and the initial phase angle of each wave component. Then a hydrodynamic transfer function was used to calculate the amplitude of the wave-maker motion associated with each wave component. Superposition was made on all the wave components to get the final wave-maker motion. During the numerical simulation, calculated horizontal velocity profiles of the extreme wave at different moments were analyzed and compared with experimental results, and a satisfactory agreement was obtained. In the simulation, VOF method was employed to capture the free surface, and a dissipation zone was used to deal with wave reflection.
机译：在实际海况下，通常是由不规则波列中的一些极端波浪或波浪群造成的对海上漂浮结构的破坏。对不规则波列的准确仿真可以为理解局部流场和可能造成此类损坏的冲击载荷奠定坚实的基础。本文介绍了如何研究单个极端波的产生。确定产生特定不规则波列的造波器运动是这项工作的关键。首先，将实验性的不规则波列分解为一定数量的小振幅波。进行傅里叶级数展开以确定每个波分量的振幅和初始相位角。然后，使用流体动力传递函数来计算与每个波分量相关的造波器运动的幅度。在所有波分量上进行叠加以获得最终的造波器运动。在数值模拟过程中，分析了不同时刻计算的极端波水平速度剖面，并与实验结果进行了比较，取得了令人满意的一致性。在仿真中，采用VOF方法捕获自由表面，并使用耗散区来处理波反射。

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  • 来源
    《Ocean Engineering》 |2011年第4期|p.651-657|共7页
  • 作者

    Xiufeng Liang; Jianmin Yang; Jun Li; Xin Li;

  • 作者单位

    State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200030, China Shanghai Waigaoqiao Shipbuilding Co., LTD., Shanghai, China;

    State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200030, China;

    State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200030, China;

    State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200030, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    numerical wave tank irregular wave train vof dynamic mesh horizontal velocity profile;

    机译：数值波箱不规则波列vof动态网格水平速度剖面;

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