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.
Keywords: High order splitting methods, diffusion-reaction equation, non-homogeneous boundary conditions, order reduction phenomena
Ramona Häberli  1
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
@article{SMAI-JCM_2026__12__269_0,
author = {Ramona H\"aberli},
title = {Overcoming the order barrier two in splitting methods when applied to semilinear parabolic problems with non-periodic boundary conditions},
journal = {The SMAI Journal of computational mathematics},
pages = {269--288},
year = {2026},
publisher = {Soci\'et\'e de Math\'ematiques Appliqu\'ees et Industrielles},
volume = {12},
doi = {10.5802/smai-jcm.149},
language = {en},
url = {https://smai-jcm.centre-mersenne.org/articles/10.5802/smai-jcm.149/}
}
TY - JOUR AU - Ramona Häberli TI - Overcoming the order barrier two in splitting methods when applied to semilinear parabolic problems with non-periodic boundary conditions JO - The SMAI Journal of computational mathematics PY - 2026 SP - 269 EP - 288 VL - 12 PB - Société de Mathématiques Appliquées et Industrielles UR - https://smai-jcm.centre-mersenne.org/articles/10.5802/smai-jcm.149/ DO - 10.5802/smai-jcm.149 LA - en ID - SMAI-JCM_2026__12__269_0 ER -
%0 Journal Article %A Ramona Häberli %T Overcoming the order barrier two in splitting methods when applied to semilinear parabolic problems with non-periodic boundary conditions %J The SMAI Journal of computational mathematics %D 2026 %P 269-288 %V 12 %I Société de Mathématiques Appliquées et Industrielles %U https://smai-jcm.centre-mersenne.org/articles/10.5802/smai-jcm.149/ %R 10.5802/smai-jcm.149 %G en %F SMAI-JCM_2026__12__269_0
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