An initial-corrected splitting approach for convection–diffusion–reaction problems

Splitting methods constitute a well-established class of numerical schemes for solving convection–diffusion–reaction problems. They have been shown to be effective in solving problems with periodic boundary conditions. However, in the case of Dirichlet boundary conditions, order reduction has been observed even with homogeneous boundary conditions. In this paper, we propose a novel splitting approach, the so-called initial-corrected splitting method, which succeeds in overcoming order reduction. A convergence analysis is performed to demonstrate, up to a logarithmic factor, second-order convergence of this modified Strang splitting method. Furthermore, we conduct numerical experiments to illustrate the performance of the newly developed splitting approach.