Peregrine型游荡波初始破碎动力学的数值与实验研究
Initial Wave Breaking Dynamics of Peregrine-Type Rogue Waves: A Numerical and Experimental Study
摘要：
基于两相纳维-斯托克斯方程，采用直接数值模拟方法，对被广泛认为是非线性聚焦引起的海洋时空局部化流氓波原型的Peregrine呼吸器进行了分析.本文应用有限体积法和流体体积法研究了Peregrine呼吸器在波浪破碎初期的动力学行为。数值计算结果与实验室实验的比较，以验证数值方法显示出非常好的协议，并建议所选择的方法是一个有效的工具，研究调制不稳定性和呼吸动力学的水波具有高精度，甚至发病的波破碎。数值结果还揭示了呼吸器水面以下流场的一些以前未被注意到的特征，这些特征对异常波的短期预报可能具有重要意义。还观察到周期性的波浪破碎。
英文摘要：
The Peregrine breather, today widely regarded as a prototype for spatio-temporally localized rogue waves on the ocean caused by nonlinear focusing, is analyzed by direct numerical simulations based on two-phase Navier-Stokes equations. A finite-volume approach with a volume of fluid method is applied to study the Peregrine breather dynamics up to the initial stages of wave breaking. The comparison of the numerical results with laboratory experiments to validate the numerical approach shows very good agreement and suggests that the chosen method is an effective tool to study modulation instability and breather dynamics in water waves with high accuracy even up to the onset of wave breaking. The numerical results also indicate some previously unnoticed characteristics of the flow fields below the water surface of breathers, which might be of significance for short-term prediction of rogue waves. Recurrent wave breaking is also observed.
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