arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.08355math.NAcs.NA
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动态边界条件下Cahn-Hilliard方程的二阶精度保结构格式

A second-order accurate structure-preserving scheme for the Cahn-Hilliard equation with a dynamic boundary condition

Makoto Okumura, Takeshi Fukao, Daisuke Furihata, Shuji Yoshikawa

摘要:

利用离散变分导数方法(DVDM)对具有动态边界条件的Cahn-Hilliard方程提出了一个保结构差分格式.在这一方法中,如何将表征方程的能量离散化是非常重要和必要的。通过修改传统的方法和使用适当的分部求和公式,我们可以使用标准的中心差分算子作为格式离散边界条件上向外法向导数的近似。我们表明,我们提出的计划是二阶准确的空间,虽然以前的结构保持计划由Yoshikawa-Wada(Commun.纯应用。肛门。16(2017),1915-1938)是一阶精确的空间。此外,我们证明了所提出的计划的稳定性,存在性和唯一性的解决方案。计算实例表明了该方案的有效性。特别是通过计算实例,我们证实了我们提出的格式可以稳定地得到数值解。

英文摘要:

We propose a structure-preserving finite difference scheme for the Cahn-Hilliard equation with a dynamic boundary condition using the discrete variational derivative method (DVDM). In this approach, it is important and essential how to discretize the energy which characterizes the equation. By modifying the conventional manner and using an appropriate summation-by-parts formula, we can use a standard central difference operator as an approximation of an outward normal derivative on the discrete boundary condition of the scheme. We show that our proposed scheme is second-order accurate in space, although the previous structure-preserving scheme by Fukao-Yoshikawa-Wada (Commun. Pure Appl. Anal. 16 (2017), 1915-1938) is first-order accurate in space. Also, we show the stability, the existence, and the uniqueness of the solution for the proposed scheme. Computation examples demonstrate the effectiveness of the proposed scheme. Especially through computation examples, we confirm that numerical solutions can be stably obtained by our proposed scheme.

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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