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arXiv 1709.02151physics.flu-dyn
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任意水深极限Stokes波的极值高度

On the Limiting Stokes' Wave of Extreme Height in Arbitrary Water Depth

Xiaoxu Zhong, Shijun Liao

摘要:

正如Schwartz(1974)和Cokelet(1977)所指出的,即使借助于Padé近似等外推方法,用摄动法也不能得到极限Stokes波在极浅水中的收敛结果。特别是对于Stokes在19世纪80年代首次提出的具有$120^\circ$夹角的尖波峰的极限波,传统的解析/数值方法很难给出其波形。因此,传统上,不同的波浪模型用于不同水深的波浪。本文利用高度非线性方程的解析近似方法--同伦分析方法(HAM),在不使用任何外推技术的情况下,成功地得到了任意水深下具有这种尖波峰的极限Stokes波的收敛结果(特别是波形),甚至包括极浅水中的极端形式的孤立波。因此,在HAM的框架下,Stokes波可以作为各种波浪的统一理论,包括深水和中等深度的周期波、浅水中的椭圆余弦波和极浅水中的孤立波。

英文摘要:

As mentioned by Schwartz (1974) and Cokelet (1977), it was failed to gain convergent results of limiting Stokes' waves in extremely shallow water by means of perturbation methods even with the aid of extrapolation techniques such as Padé approximant. Especially, it is extremely difficult for traditional analytic/numerical approaches to present the wave profile of limiting waves with a sharp crest of $120^\circ$ included angle first mentioned by Stokes in 1880s. Thus, traditionally, different wave models are used for waves in different water depths. In this paper, by means of the homotopy analysis method (HAM), an analytic approximation method for highly nonlinear equations, we successfully gain convergent results (and especially the wave profiles) of the limiting Stokes' waves with this kind of sharp crest in arbitrary water depth, even including solitary waves of extreme form in extremely shallow water, without using any extrapolation techniques. Therefore, in the frame of the HAM, the Stokes' wave can be used as a unified theory for all kinds of waves, including periodic waves in deep and intermediate depth, cnoidal waves in shallow water and solitary waves in extremely shallow water.

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