Overcoming the order barrier two in splitting methods when applied to semilinear parabolic problems with non-periodic boundary conditions
The SMAI Journal of computational mathematics, Volume 12 (2026), pp. 269-288

In general, high order splitting methods suffer from an order reduction phenomena when applied to the time integration of partial differential equations with non-periodic boundary conditions. In the last decade, there were introduced several modifications to prevent the second order Strang splitting method from such a phenomena. In this article, inspired by these recent corrector techniques, we introduce a splitting method of order three for a class of semilinear parabolic problems that avoids order reduction in the context of non-periodic boundary conditions. We give a proof for the third order convergence of the method in a simplified linear setting and confirm the result by numerical experiments. Moreover, we show numerically that the high order convergence persists for an order four variant of a splitting method, and also for a nonlinear source term.

Published online:
DOI: 10.5802/smai-jcm.149
Classification: 65M12, 65L04
Keywords: High order splitting methods, diffusion-reaction equation, non-homogeneous boundary conditions, order reduction phenomena

Ramona Häberli  1

1 Université de Genève, Switzerland
Ramona Häberli. Overcoming the order barrier two in splitting methods when applied to semilinear parabolic problems with non-periodic boundary conditions. The SMAI Journal of computational mathematics, Volume 12 (2026), pp. 269-288. doi: 10.5802/smai-jcm.149
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