An efficient and convergent finite element scheme for Cahn--Hilliard equations with dynamic boundary conditions

Abstract

The Cahn--Hilliard equation is a widely used model that describes amongst others phase separation processes of binary mixtures or two-phase flows. In the recent years, different types of boundary conditions for the Cahn--Hilliard equation were proposed and analyzed. In this publication, we are concerned with the numerical treatment of a recent model which introduces an additional Cahn--Hilliard type equation on the boundary as closure for the Cahn--Hilliard equation in the domain [C. Liu, H. Wu, Arch. Ration. Mech. An., 2019]. By identifying a mapping between the phase-field parameter and the chemical potential inside of the domain, we are able to postulate an efficient, unconditionally energy stable finite element scheme. Furthermore, we establish the convergence of discrete solutions towards suitable weak solutions of the original model. This serves also as an additional pathway to establish existence of weak solutions. Furthermore, we present simulations underlining the practicality of the proposed scheme and investigate its experimental order of convergence.

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• Phase-field dynamics with transfer of materials: The Cahn--Hilliard equation with reaction rate dependent dynamic boundary conditions
• Convergence of a Robin boundary approximation for a Cahn--Hilliard system with dynamic boundary conditions
• A convergent SAV scheme for Cahn--Hilliard equations with dynamic boundary conditions
• Long-time dynamics of the Cahn--Hilliard equation with kinetic rate dependent dynamic boundary conditions
• Well-posedness of a bulk-surface convective Cahn--Hilliard system with dynamic boundary conditions
• Strong well-posedness and separation properties for a bulk-surface convective Cahn--Hilliard system with singular potentials
• Numerical approximations and error analysis of the Cahn-Hilliard equation with reaction rate dependent dynamic boundary conditions
• Numerical Approximations and Error Analysis of the Cahn-Hilliard Equation with Dynamic Boundary Conditions
• A convergent stochastic scalar auxiliary variable method