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A nonlinear potential flow model for higher-harmonic wave loads and ringing response of a monopile

机译：一种非线性电位流模型，用于高谐波载荷和单披露的振铃响应

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摘要

This paper presents a numerical investigation on the high-frequency wave loads and ringing responses of offshore wind turbine foundations exposed to steep waves. A time-domain nonlinear potential flow model is developed based on the weak-scatterer approximation. On the free surface, an arbitrary Lagrangian-Eulerian (ALE) approach is adopted in the time marching process. The higher-order boundary element method (HOBEM) is employed to solve the corresponding boundary value problem at each time step. The proposed model is verified by a series of nonlinear wave diffraction problems in regular waves. It appears that in terms of the wave run-up and higher-harmonic wave forces, the present results are all in satisfactory agreement with the published experimental results and other theoretical or numerical solutions. The ringing response of a bottom-hinged monopile exposed to moderately steep focused wave groups is subsequently investigated for several different wave conditions. The effects of peak frequency, input wave amplitude and damping ratio on the ringing response are discussed.
机译：本文介绍了海上风力涡轮机基础暴露于陡峭波的高频波负荷和振铃响应的数值研究。基于弱散射器近似开发了时域非线性电位流模型。在自由面上，在进行时期采用任意拉格朗日 - 欧拉（ALE）方法。使用高阶边界元方法（HOBEM）来在每个时间步骤解决对应的边界值问题。所提出的模型通过常规波的一系列非线性波衍射问题验证。看来，就波浪升高和高谐波力而言，目前的结果均以发表的实验结果和其他理论或数值解决方案令人满意的协议。随后研究了暴露于中等陡焦波组的底部铰链型单潜水线的振铃响应，用于几种不同的波条件。讨论了峰值频率，输入波幅度和阻尼比对振铃响应的影响。

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