We consider a loosely coupled, non-iterative Robin-Robin coupling method proposed and analyzed in [Numer. Algorithms, 99:921-948, 2025] for a parabolic-parabolic interface problem. We modify the first step of the scheme so that several error difference quantities remain higher order convergence without requiring additional assumptions. Numerical results are presented to support our findings.
@article{arxiv.2509.08103,
title = {An Improved Robin-Robin Coupling Method for Parabolic-Parabolic Interface Problems},
author = {Erik Burman and Miguel A. Fernandez and Johnny Guzman and Sijing Liu},
journal= {arXiv preprint arXiv:2509.08103},
year = {2025}
}