Highly directionally spread, overturning breaking waves modelled with Smoothed Particle Hydrodynamics: A case study involving the Draupner wave
Highly directionally spread, overturning breaking waves modelled with Smoothed Particle Hydrodynamics: A case study involving the Draupner wave
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DOI：
10.1016/j.ocemod.2021.101822
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发表时间：
2021-08
期刊：
影响因子：
3.2
通讯作者：
Taiga Kanehira;M. L. McAllister;S. Draycott;Takuji Nakashima;N. Taniguchi;David Ingram;T. S. V. D. Bremer;Hidemi Mutsuda
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作者：
Taiga Kanehira;M. L. McAllister;S. Draycott;Takuji Nakashima;N. Taniguchi;David Ingram;T. S. V. D. Bremer;Hidemi Mutsuda
海洋中的波浪破碎影响着极端波浪的高度、能量耗散以及大气与上层海洋之间的相互作用。数值模拟是理解波浪破碎物理学的关键一步，并提供了难以从现场数据或实验中获得的见解。三维破碎波的高保真数值模拟极具挑战性。传统的基于网格的数值方法难以模拟波浪破碎过程中出现的陡峭和双值自由表面。光滑粒子流体动力学（SPH）方法不属于这些问题的牺牲品。在这里，我们研究的SPH方法的能力，模拟高度定向传播的倾覆破碎波的数值再现麦卡利斯特等人的实验。（2019年）。我们发现，SPH方法重现实验观察以及比较实验和数值测量时，我们实现的决定系数值为0。92比0。95，由于有限的分辨率，一些较小规模的功能不太好复制。我们还研究方面的模拟波的几何形状和运动学，并发现现有的破碎标准是很难适用于高度定向传播的条件。
Wave breaking in the ocean affects the height of extreme waves, energy dissipation, and interaction between the atmosphere and upper ocean. Numerical modelling is a critical step in understanding the physics of wave breaking and offers insight that is hard to gain from field data or experiments. High-fidelity numerical modelling of three-dimensional breaking waves is extremely challenging. Conventional grid-based numerical methods struggle to model the steep and double-valued free surfaces that occur during wave breaking. The Smoothed Particle Hydrodynamics (SPH) method does not fall prey to these issues. Herein, we examine the SPH method’s ability to model highly directionally spread overturning breaking waves by numerically reproducing the experiments presented in McAllister et al.(2019). We find that the SPH method reproduces the experimental observations well; when comparing experimental and numerical measurements we achieve coefficient of determination values of 0. 92− 0. 95, with some smaller-scale features less well reproduced owing to finite resolution. We also examine aspects of the simulated wave’s geometry and kinematics and find that existing breaking criteria are difficult to apply in highly directionally spread conditions.