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arXiv 2007.00989math.AP
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一类交叉扩散Cahn-Hilliard型方程组弱解的存在性

Existence of weak solutions to a cross-diffusion Cahn-Hilliard type system

Virginie Ehrlacher, Greta Marino, Jan-Frederik Pietschmann

摘要:

本文的目的是研究一个多组分混合物的Cahn-Hilliard模型,该模型具有交叉扩散效应,简并迁移率,并且只有一个物种与其他物种分离。我们定义了适应于可能的退化的弱解的概念,我们的主要结果是(在时间上的整体)存在。为了克服先验估计的不足,我们的证明使用了系统的形式梯度流结构和熵方法的有界性的扩展,其中包括一个辅助变分问题的仔细分析。这允许获得近似的时间离散系统离散系统的解。让时间步长为零,我们恢复所需的弱解,由于他们的低正则性,Cahn-Hilliard条款需要一个特殊的处理。

英文摘要:

The aim of this article is to study a Cahn-Hilliard model for a multicomponent mixture with cross-diffusion effects, degenerate mobility and where only one of the species does separate from the others. We define a notion of weak solution adapted to possible degeneracies and our main result is (global in time) existence. In order to overcome the lack of a-priori estimates, our proof uses the formal gradient flow structure of the system and an extension of the boundedness by entropy method which involves a careful analysis of an auxiliary variational problem. This allows to obtain solutions to an approximate, time-discrete system. Letting the time step size go to zero, we recover the desired weak solution where, due to their low regularity, the Cahn-Hilliard terms require a special treatment.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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