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arXiv 2202.01455math.NAcs.NA
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Cahn-Hilliard磁流体动力学问题全离散格式的误差分析

Error analysis of a fully discrete scheme for the Cahn-Hilliard-Magneto-hydrodynamics problem

Hailong Qiu

摘要:

在本文中,我们分析了一个完全离散的计划耦合的一般Cahn-Hilliard方程与非稳态磁流体动力学流,它描述了两个不混溶的,不可压缩的导电流体具有不同的迁移率,流体粘度和磁扩散率。详细讨论了一种典型的全离散格式,该格式由协调有限元法和基于能量凸分裂的Euler半隐式离散方法组成。我们证明了我们的格式是无条件能量稳定的,并得到了浓度场、化学势、速度场、磁场和压力的最优误差估计。数值试验的结果验证了收敛速度。

英文摘要:

In this paper we analyze a fully discrete scheme for a general Cahn-Hilliard equation coupled with a nonsteady Magneto-hydrodynamics flow, which describes two immiscible, incompressible and electrically conducting fluids with different mobilities, fluid viscosities and magnetic diffusivities. A typical fully discrete scheme, which is comprised of conforming finite element method and the Euler semi-implicit discretization based on a convex splitting of the energy of the equation is considered in detail. We prove that our scheme is unconditionally energy stability and obtain some optimal error estimates for the concentration field, the chemical potential, the velocity field, the magnetic field and the pressure. The results of numerical tests are presented to validate the rates of convergence.

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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