Unified depth-limited wave breaking detection and dissipation in fully nonlinear potential flow models
Unified depth-limited wave breaking detection and dissipation in fully nonlinear potential flow models
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DOI：
10.1016/j.coastaleng.2023.104316
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发表时间：
2023-04
影响因子：
4.4
通讯作者：
Sunil Mohanlal;Jeffrey C. Harris;M. Yates;S. Grilli
中科院分区：
文献类型：
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作者：
Sunil Mohanlal;Jeffrey C. Harris;M. Yates;S. Grilli
在二维全非线性势流（FNPF）模型中，基于无量纲断裂强度参数，提出了一种结合通用断裂起始准则的深度受限破波能量耗散模拟新方法。采用两种不同的2D-FNPF模型，分别基于切比雪夫多项式展开和边界元法求解拉普拉斯方程。在这些模型中，根据波峰u处水平粒子速度相对于波峰速度c的比值，使用早期工作中提出的通用破碎开始准则实时检测即将发生的破碎波，B= u/c> 0。85. 对于这些波浪，波浪能量通过吸收表面压力在局部消散，吸收表面压力使用反向水力跳跃类比进行校准。该方法首先对平面滩和沙洲上的周期性溢浪进行了验证，结果与实验数据吻合较好。将该破断耗散模型以无量纲破断强度的形式进行重新建模，结果表明，水力跳跃模拟与恒定破断强度模型的结果相似，并且对周期性俯冲破断也有很好的一致性。然后将同样的方法应用于淹没沙洲上的不规则波浪浅滩，并显示出与波高，不对称，偏度和峰度的实验数据非常吻合。未来的工作将把这个2D破浪模型扩展到三维（3D）破浪的情况下，在现有的3D- fnpf模型中，在浅水或深水条件下进行模拟。
A new method is proposed for simulating the energy dissipation resulting from depth-limited wave breaking, in combination with a universal breaking onset criterion, in two-dimensional (2D) fully nonlinear potential flow (FNPF) models, based on a non-dimensional breaking strength parameter. Two different 2D-FNPF models are used, which solve the Laplace equation based on Chebyshev polynomial expansions or a boundary element method. In these models, impending breaking waves are detected in real time using a universal breaking onset criterion proposed in earlier work, based on the ratio of the horizontal particle velocity at the crest u, relative to the crest velocity c, B= u/c> 0. 85. For these waves, wave energy is dissipated locally with an absorbing surface pressure that is calibrated using an inverted hydraulic jump analogy. This approach is first validated for periodic spilling breakers over plane beaches and bars, for which results are shown to be in good agreement with experimental data. Recasting this breaking dissipation model in terms of a non-dimensional breaking strength, the hydraulic jump analog is shown to provide results similar to those of a constant breaking strength model, and to yield good agreement for periodic plunging breakers as well. The same approach is then applied to irregular waves shoaling over a submerged bar, and is shown to agree well with experimental data for the wave height, asymmetry, skewness, and kurtosis. Future work will extend this 2D breaker model to cases of three-dimensional (3D) breaking waves, simulated in existing 3D-FNPF models, in shallow or deep water conditions.