Efficient and energy stable method for the Cahn-Hilliard phase-field model for diblock copolymers.

• We propose a novel stabilized SAV approach for solving the phase field model for diblock copolymers. • The proposed schemes are second-order accurate, provably unconditionally energy stable, non-iterative. • The added linear stabilization term is shown to be crucial enhance the stability while keeping the required accuracy. • One only need to solve three decoupled linear equations at each time step. • We further prove the unconditional energy stabilities rigorously and present numerous 2D and 3D simulations. In this paper, we consider numerical approximations to solving the Cahn-Hilliard phase field model for diblock copolymers. We combine the recently developed SAV (scalar auxiliary variable) approach with the stabilization technique to arrive at a novel stabilized-SAV method, where a crucial linear stabilization term is added to enhancing the stability and keeping the required accuracy while using the large time steps. The scheme is very easy-to-implement and fast in the sense that one only needs to solve two decoupled fourth-order biharmonic equations with constant coefficients at each time step. We further prove the unconditional energy stability of the scheme rigorously. Through the comparisons with some other prevalent schemes like the fully-implicit, convex-splitting, and non-stabilized SAV scheme for some benchmark numerical examples in 2D and 3D, we demonstrate the stability and the accuracy of the developed scheme numerically. [ABSTRACT FROM AUTHOR]