Error Analysis of a New Euler Semi-Implicit Time-Discrete Scheme for the Incompressible MHD System with Variable Density

The incompressible magnetohydrodynamics system with variable density is coupled by the incompressible Navier-Stokes equations with variable density and the Maxwell equations. In this paper, we study a new first-order Euler semi-discrete scheme for solving this system. The proposed numerical scheme is unconditionally stable for any time step size tau > 0. Furthermore, a rigorous error analysis is presented and the first-order temporal convergence rate O (tau) is derived by using the method of mathematical induction and the discrete maximal L-p-regularity of the Stokes problem. Finally, numerical results are given to support the theoretical analysis.