Decoupled, Energy Stable Scheme for Hydrodynamic Allen-Cahn Phase Field Moving Contact Line Model

Decoupled, Energy Stable Scheme for Hydrodynamic Allen-Cahn Phase Field Moving Contact Line Model
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流体动力学 Allen-Cahn 相场动接触线模型的解耦、能量稳定方案

DOI:
10.4208/jcm.1703-m2016-0614
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发表时间:
2017-03
影响因子:
0.9
通讯作者:
Hui Zhang
Hui Zhang
中科院分区:
数学4区
文献类型:
--
作者:
Rui Chen;Xiaofeng Yang;Hui Zhang

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本文提出了一种有效的能量稳定格式来求解包含接触线条件的相场模型。本文采用Allen-Cahn型相场模型与不可压Navier-Stokes方程耦合,并结合静态接触线边界条件,取代了通常使用的Cahn-Hilliard型相场方程。用投影法处理Navier-Stokes方程,并对非凸的Ginzburg-Landau体势引入辅助函数。我们证明了该方案是线性的,解耦的和能量稳定的。此外,我们证明了全离散格式也是能量稳定的。一个有效的有限元空间离散方法,实现了验证所提出的格式的精度和效率。数值结果表明,该格式是非常有效和精确的
In this paper, we present an efficient energy stable scheme to solve a phase field model incorporating contact line condition. Instead of the usually used Cahn-Hilliard type phase equation, we adopt the Allen-Cahn type phase field model with the static contact line boundary condition that coupled with incompressible Navier-Stokes equations with Navier boundary condition. The projection method is used to deal with the Navier-Stokes equa- tions and an auxiliary function is introduced for the non-convex Ginzburg-Landau bulk potential. We show that the scheme is linear, decoupled and energy stable. Moreover, we prove that fully discrete scheme is also energy stable. An efficient finite element spatial discretization method is implemented to verify the accuracy and efficiency of proposed schemes. Numerical results show that the proposed scheme is very efficient and accurate
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