2026-04-20T17:29:46Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/79652023-11-10T01:05:30Zcom_10259_6229com_10259_4534com_10259.4_106com_10259_2604col_10259_6230

Avoiding order reduction when integrating linear initial boundary value problems with exponential splitting methods Alonso Mallo, Isaías Cano, Begoña Reguera López, Nuria Exponential Lie-Trotter Exponential Strang Avoiding order reduction Initial boundary value problems It is well known the order reduction phenomenon which arises when exponential methods are used to integrate time-dependent initial boundary value problems, so that the classical order of these methods is reduced. In particular, this subject has been recently studied for Lie–Trotter and Strang exponential splitting methods, and the order observed in practice has been exactly calculated. In this article, a technique is suggested to avoid that order reduction. We deal directly with nonhomogeneous time-dependent boundary conditions, without having to reduce the problem to the homogeneous ones. We give a thorough error analysis of the full discretization and justify why the computational cost of the technique is negligible in comparison with the rest of the calculations of the method. Some numerical results for dimension splittings are shown, which corroborate that much more accuracy is achieved. 2023-11-09T08:28:23Z 2023-11-09T08:28:23Z 2023-11-09T08:28:23Z 2018-08 info:eu-repo/semantics/article 0272-4979 http://hdl.handle.net/10259/7965 10.1093/imanum/drx047 1464-3642 eng IMA Journal of Numerical Analysis. 2018, V. 38, n. 3, p. 1294-1323 https://doi.org/10.1093/imanum/drx047 info:eu-repo/semantics/openAccess Oxford University Press