Efficient linear, decoupled, and unconditionally stable scheme for a ternary Cahn-Hilliard type Nakazawa-Ohta phase-field model for tri-block copolymers

We establish a ternary Cahn-Hilliard type Nakazawa-Ohta phase-field model for the triblock copolymer, and study its numerical approximation. The is highly coupled nonlinear system, consisting of two equations nonlocal equations. solve by constructing second-order accurate, time-marching scheme via Scalar Auxiliary Variable (SAV) approach combined with stabilization technique. At every time step, composed several decoupled bi-Laplace equations, which makes it first linear fully-decoupled scheme. further prove unconditional energy stability rigorously perform numerous simulations in 2D 3D to illustrate numerically.