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arXiv 0708.0638math-phmath.MP
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Korteweg de Vries方程和Painlevé- II方程多尺度展开的数值研究

Numerical study of a multiscale expansion of the Korteweg de Vries equation and Painlevé-II equation

T. Grava, C. Klein

摘要:

具有小色散的$\e^2$($\e\ll 1$)阶Korteweg de Vries(KdV)方程的Cauchy问题的特征在于出现快速调制振荡区。这些振荡近似地由KdV的椭圆解描述,其中振幅、波数和频率不是常数,而是根据Whitham方程演化。而KdV和渐近解之间的差异在Whitham振荡区的内部随着$ε$而减小,已知在该区域的前缘附近仅为$ε^{1/3}$阶。为了获得一个更准确的描述附近的前沿的振荡区,我们提出了一个多尺度扩展的解决方案KdV的Hastings-McLeod解决方案的Painlevé-II方程。我们数值计算表明,所得到的多尺度解近似KdV解,在小色散限制,为了$ε^{2/3}$。

英文摘要:

The Cauchy problem for the Korteweg de Vries (KdV) equation with small dispersion of order $\e^2$, $\e\ll 1$, is characterized by the appearance of a zone of rapid modulated oscillations. These oscillations are approximately described by the elliptic solution of KdV where the amplitude, wave-number and frequency are not constant but evolve according to the Whitham equations. Whereas the difference between the KdV and the asymptotic solution decreases as $ε$ in the interior of the Whitham oscillatory zone, it is known to be only of order $ε^{1/3}$ near the leading edge of this zone. To obtain a more accurate description near the leading edge of the oscillatory zone we present a multiscale expansion of the solution of KdV in terms of the Hastings-McLeod solution of the Painlevé-II equation. We show numerically that the resulting multiscale solution approximates the KdV solution, in the small dispersion limit, to the order $ε^{2/3}$.

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