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时空聚焦模型由于可以较好的体现出畸形波的偶然性、短暂性、能量汇聚性等特点而广泛用于畸形波的实验模拟和数值模拟,但通常得到的波浪具有随机性,而且无法模拟特定形态的畸形波。该文为解决上述问题,从初始扰动反演过程的角度,以Gauss包络为例,研究了畸形波的时空聚焦演化。建立求解二维N-S方程的数值波浪水槽,模拟了畸形波的生成演化。采用的表达式可以较好地反映畸形波的大波高、短暂性、连续大波等特点,且对于海洋结构物的安全性评估有参考意义。数值结果与理论吻合良好,证明了表达式的正确性。
The space-time focusing model is widely used in the experimental simulation and numerical simulation of the freak waves because it can better reflect the contingency, transient, energy convergence characteristics of the freak waves, but usually the wave is random and can not simulate a specific shape Deformity wave. In order to solve the above problems, from the point of view of initial perturbation inversion process, taking Gaussian envelope as an example, the temporal and spatial focus evolution of the distorted wave is studied. A numerical wave tank for solving two-dimensional N-S equation was established to simulate the formation and evolution of the normal wave. The expressions adopted can well reflect the characteristics of large waves, transient waves and continuous large waves of the normal waves, and have reference significance for the safety assessment of marine structures. The numerical results are in good agreement with the theory, which proves the correctness of the expression.