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arXiv 2507.02402math.NAcs.NA
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Cahn-Hilliard-Navier-Stokes系统的二阶无条件稳定时间滤波格式

Second-order unconditionally stable time-filtered scheme for Cahn-Hilliard-Navier-Stokes system

Xi Li, Chun Song, Haijun Gao, Minfu Feng

AI总结:

本文通过时间滤波技术将CHNS系统的一阶半隐式格式提升为二阶精度,并证明其无条件能量稳定,同时扩展了变步长与自适应步长策略。

摘要:

本文引入时间滤波技术,为Cahn-Hilliard-Navier-Stokes(CHNS)系统构造了若干创新的时间半离散格式。这些格式在保持无条件能量稳定性的同时,实现了二阶时间精度。我们的方法首先采用一阶半隐式方法对CHNS系统进行离散化,随后通过应用时间滤波技术,将时间精度从一阶提升至二阶。这一改进仅需对原始一阶半隐式格式进行微小修改,从而能够以极低的代价获得更高的精度。此外,我们通过理论分析严格证明了所提格式的无条件能量稳定性。进一步地,我们将工作扩展到构造包含变时间步长和自适应时间步长策略的半离散格式,增强了模拟的灵活性和效率。文中给出数值算例以验证理论结果并展示所提方法的有效性。

英文摘要:

In this work, we introduce the time filtering technique to develop several innovative semi-discrete schemes in time for the Cahn-Hilliard-Navier-Stokes (CHNS) system. These schemes achieve second-order temporal accuracy while maintaining unconditional energy stability. Our approach begins with the discretization of the CHNS system using the first-order semi-implicit method. Subsequently, by applying time filtering techniques, we improve the temporal accuracy from first-order to second-order. This improvement requires only minor modifications to the original first-order semi-implicit scheme, thereby enabling higher accuracy to be achieved at minimal cost. Moreover, we rigorously establish the unconditional energy stability of the proposed schemes through theoretical analysis. Additionally, we extend our work to develop semi-discrete schemes that incorporate variable and adaptive time-stepping strategies, enhancing the flexibility and efficiency of simulations. Numerical examples are presented to validate the theoretical results and demonstrate the effectiveness of the proposed methods.

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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