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arXiv 2004.05163math.NAcs.NA
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Cahn-Hilliard梯度流的能量稳定线性扩散Crank-Nicolson格式

An Energy Stable Linear Diffusive Crank-Nicolson Scheme for the Cahn-Hilliard Gradient Flow

Lin Wang, Haijun Yu

摘要:

我们提出并分析了一个线性稳定的半隐式扩散Crank-Nicolson格式的Cahn-Hilliard梯度流。在该格式中,非线性体力被显式地处理为两个二阶稳定项。这种处理导致线性椭圆系统的常系数和可证明的离散能量耗散。对全离散格式进行了严格的误差分析。当时间步长和空间步长足够小时,通过$1/\varepsilon$的某个低次多项式控制前因子,可获得时间上的二阶精度。{Here $\varepsilon$是界面的厚度。数值结果与自适应时间步长一起验证了所提出的方法的精度和效率。

英文摘要:

We propose and analyze a linearly stabilized semi-implicit diffusive Crank--Nicolson scheme for the Cahn--Hilliard gradient flow. In this scheme, the nonlinear bulk force is treated explicitly with two second-order stabilization terms. This treatment leads to linear elliptic system with constant coefficients and provable discrete energy dissipation. Rigorous error analysis is carried out for the fully discrete scheme. When the time step-size and the space step-size are small enough, second order accuracy in time is obtained with a prefactor controlled by some lower degree polynomial of $1/\varepsilon$. {Here $\varepsilon$ is the thickness of the interface}. Numerical results together with an adaptive time stepping are presented to verify the accuracy and efficiency of the 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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