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arXiv 0907.2758math.AP
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二维弱非线性Stefan问题中Kuramoto-Sivashinsky方程的严格推导

Rigorous derivation of the Kuramoto-Sivashinsky equation in a 2D weakly nonlinear Stefan problem

Claude-Michel Brauner, Josephus Hulshof, Luca Lorenzi

摘要:

本文对自由边界问题中的Kuramoto-Sivashinsky方程(K-S)进行了严格的推导。作为一个范例,我们考虑一个二维Stefan问题的一个带,一个简化版本的固-液界面模型。在不稳定阈值附近,我们引入一个小参数$\varepsilon$并相应地定义重新缩放的变量。在固定的$\varepsilon$,我们的方法是基于:一个合适的线性一维算子的定义,投影相对于纵坐标只,Lyapunov-Schmidt方法。作为可解性条件,我们导出了一个自洽的抛物型方程。我们证明,从相同的配置,后者仍然接近的解决方案K-S在一个固定的时间间隔,均匀在$\varepsilon$足够小。

英文摘要:

In this paper we are interested in a rigorous derivation of the Kuramoto-Sivashinsky equation (K--S) in a Free Boundary Problem. As a paradigm, we consider a two-dimensional Stefan problem in a strip, a simplified version of a solid-liquid interface model. Near the instability threshold, we introduce a small parameter $\varepsilon$ and define rescaled variables accordingly. At fixed $\varepsilon$, our method is based on: definition of a suitable linear 1D operator, projection with respect to the longitudinal coordinate only, Lyapunov-Schmidt method. As a solvability condition, we derive a self-consistent parabolic equation for the front. We prove that, starting from the same configuration, the latter remains close to the solution of K--S on a fixed time interval, uniformly in $\varepsilon$ sufficiently small.

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