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arXiv 1004.0407nlin.PScs.NAmath.NA
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非周期波的KP方程数值研究

Numerical study of the KP equation for non-periodic waves

The Ohio State University(俄亥俄州立大学)

Chiu-Yen Kao, Yuji Kodama

AI总结:

通过直接数值模拟研究具有V形和X形初始波的KP方程初值问题,证明解渐近收敛于精确孤子解。

摘要:

Kadomtsev-Petviashvili (KP) 方程描述了在准二维情况下传播的弱色散小振幅波。最近,KP方程的大量精确孤子解已被发现并分类。这些孤子解在二维平面中沿某些线局域化,并在其他位置指数衰减,本文中称为线孤子解。分类基于解的远场模式,这些模式由有限数量的线孤子组成。本文通过直接数值模拟,研究了具有由两个不同线孤子组成的V形和X形初始波的KP方程初值问题。然后我们证明解渐近收敛于某些精确孤子解。收敛是在局部定义的$L^2$意义下。本文考虑的初始波模式与浅水波问题中由非线性波相互作用产生的畸形波有关。

英文摘要:

The Kadomtsev-Petviashvili (KP) equation describes weakly dispersive and small amplitude waves propagating in a quasi-two dimensional situation. Recently a large variety of exact soliton solutions of the KP equation has been found and classified. Those soliton solutions are localized along certain lines in a two-dimensional plane and decay exponentially everywhere else, and they are called line-soliton solutions in this paper. The classification is based on the far-field patterns of the solutions which consist of a finite number of line-solitons. In this paper, we study the initial value problem of the KP equation with V- and X-shape initial waves consisting of two distinct line-solitons by means of the direct numerical simulation. We then show that the solution converges asymptotically to some of those exact soliton solutions. The convergence is in a locally defined $L^2$-sense. The initial wave patterns considered in this paper are related to the rogue waves generated by nonlinear wave interactions in shallow water wave problem.

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