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Numerical and Experimental Investigation of Extreme Events in JONSWAP Seas

机译:JONSWAP海域极端事件的数值和实验研究

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The dynamics of nonlinear water waves and extreme wavesin particular can be accurately investigated numerically using anumerical wave tank (NWT), implemented by the higher-orderspectral method (HOS). In fact, a number of laboratory studiesvalidated the proposed numerical approach, while a very highvalidation accuracy is reached. We present a numerical studybased on a HOS-NWT scheme in the investigation of the onedimensionalpropagation of extreme events in JONSWAP seas,having their origin from exact breather solutions of the nonlinearSchrodinger equation. Indeed, breathers are known to modelextreme waves, when the wave eld's spectrum is assumed to benarrow-banded. On the other hand recent experimental studiesconrmed that these localized structures can also evolve, whenwind or significant perturbations are at play. We will investigatethe validity of the proposed numerical scheme by comparing thesimulation results to laboratory data. The dynamics of both waveelds show indeed a very good agreement.
机译:非线性水波和极端波的动力学 特别是可以使用 数字波箱(NWT),由高阶实现 光谱法(HOS)。实际上,许多实验室研究 验证了建议的数值方法,同时非常高 达到验证准确性。我们提出一个数值研究 基于HOS-NWT方案的一维研究 极端事件在JONSWAP海洋中的传播, 其源于非线性的精确呼吸解 Schr odinger方程。确实,众所周知,呼吸器可以建模 假设波场频谱为 窄带的。另一方面,最近的实验研究 确信这些局部结构也可以在 风或重大扰动正在起作用。我们将调查 通过比较以下方法,提出的数值方案的有效性 仿真结果转换为实验室数据。两种波的动力学 领域确实显示出非常好的协议。

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