Numerical Approximations for a Phase-Field Moving Contact Line Model with Variable Densities and Viscosities
This work provides practical numerical methods for simulating two-phase flows with moving contact lines, which is important for applications in microfluidics and coating processes.
The authors developed two unconditionally energy stable numerical schemes for a phase-field moving contact line model with variable densities and viscosities, achieving efficient and accurate simulations.
We consider the numerical approximations of a two-phase hydrodynamics coupled phase-field model that incorporates the variable densities, viscosities and moving contact line boundary conditions. The model is a nonlinear, coupled system that consists of incompressible Navier--Stokes equations with the generalized Navier boundary condition, and the Cahn--Hilliard equations with moving contact line boundary conditions. By some subtle explicit--implicit treatments to nonlinear terms, we develop two efficient, unconditionally energy stable numerical schemes, in particular, a linear decoupled energy stable scheme for the system with static contact line condition, and a nonlinear energy stable scheme for the system with dynamic contact line condition. An efficient spectral-Galerkin spatial discretization is implemented to verify the accuracy and efficiency of proposed schemes. Various numerical results show that the proposed schemes are efficient and accurate.