arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2003.14399math.NAcs.NA
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多项式非线性Cahn-Hilliard方程经典格式的长时间$\mathcal H^s_α$稳定性

Long time $\mathcal H^s_α$ stability of a classical scheme for Cahn-Hilliard equation with polynomial nonlinearity

Wansheng Wang

摘要:

本文研究了多项式非线性Cahn-Hilliard方程隐式Euler格式的长时间稳定性。对该变时间步长格式的数值解,在$H^{-1}$和$\mathcal H^s_α$($s=1,2,3$)空间中得到了与初始数据和时间离散步长无关的一致估计,并在利用一致离散Gronwall引理得到的离散化学势的一致$H^1$估计的基础上,得到了一致$\mathcal H^3_α$界.与连续时间动力系统的估计比较表明,经典的隐式欧拉法能完全保持系统的长时间行为.利用傅立叶伪谱空间近似的数值实验也证明了这种长时间行为。

英文摘要:

In this paper we investigate the long time stability of the implicit Euler scheme for the Cahn-Hilliard equation with polynomial nonlinearity. The uniform estimates in $H^{-1}$ and $\mathcal H^s_α$ ($s=1,2,3$) spaces independent of the initial data and time discrete step-sizes are derived for the numerical solution produced by this classical scheme with variable time step-sizes.The uniform $\mathcal H^3_α$ bound is obtained on basis of the uniform $H^1$ estimate for the discrete chemical potential which is derived with the aid of the uniform discrete Gronwall lemma. A comparison with the estimates for the continuous-in-time dynamical system reveals that the classical implicit Euler method can completely preserve the long time behaviour of the underlying system. Such a long time behaviour is also demonstrated by the numerical experiments with the help of Fourier pseudospectral space approximation.

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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