arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.03701math.APcs.NAmath.NA
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Cahn-Hilliard方程隐式-显式离散的稳定性分析

Stability analysis for the Implicit-Explicit discretization of the Cahn-Hilliard equation

Dong Li, Tao Tang

摘要:

隐式-显式方法已被广泛用于相场问题的有效数值模拟,如Cahn-Hilliard方程或薄膜型方程。由于耗散系数小的影响,使得理论分析缺乏最大值原理和刚度,现有的理论分析大多依赖于增加额外的稳定项、缓和非线性或引入辅助变量,这些方法或隐式地改变了问题的结构,或以微妙的方式用精度换取稳定性。在这项工作中,我们引入了一个强大的理论框架,直接分析的稳定性标准隐式显式方法没有稳定或任何其他修改。我们采取的Cahn-Hilliard方程作为一个模型的情况下,并证明自然的时间步长约束下的能量稳定性,这是最佳的能量缩放。这解决了自陈、沈\cite{CS98}工作以来一直悬而未决的几个问题。

英文摘要:

Implicit-Explicit methods have been widely used for the efficient numerical simulation of phase field problems such as the Cahn-Hilliard equation or thin film type equations. Due to the lack of maximum principle and stiffness caused by the effect of small dissipation coefficient, most existing theoretical analysis relies on adding additional stabilization terms, mollifying the nonlinearity or introducing auxiliary variables which implicitly either changes the structure of the problem or trades accuracy for stability in a subtle way. In this work we introduce a robust theoretical framework to analyze directly the stability of the standard implicit-explicit approach without stabilization or any other modification. We take the Cahn-Hilliard equation as a model case and prove energy stability under natural time step constraints which are optimal with respect to energy scaling. These settle several questions which have been open since the work of Chen and Shen \cite{CS98}.

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