ERROR ANALYSIS OF LINEARIZED SEMI-IMPLICIT GALERKIN FINITE ELEMENT METHODS FOR NONLINEAR PARABOLIC EQUATIONS

This paper is concerned with the time-step condition of commonly-used linearized semi implicit schemes for nonlinear parabolic PDEs with Galerkin finite element approximations. In particular, we study the time-dependent nonlinear Joule heating equations. We present optimal error estimates of the semi-implicit Euler scheme in both the L-2 norm and the H-1 norm without any time-step restriction. Theoretical analysis is based on a new splitting of error function and precise analysis of a corresponding time-discrete system. The method used in this paper is applicable for more general nonlinear parabolic systems and many other linearized (semi)-implicit time discretizations for which previous works often require certain restriction on the time-step size tau.