Gautschi-type and implicit-explicit integrators for constrained wave equations
Abstract
This paper deals with the construction and analysis of two integrators for (semi-linear) second-order partial differential-algebraic equations of semi-explicit type. More precisely, we consider an implicit-explicit Crank-Nicolson scheme as well as an exponential integrator of Gautschi type. For this, well-known wave integrators for unconstrained systems are combined with techniques known from the field of differential-algebraic equations. This results in efficient time stepping schemes that are provable of second order. Moreover, we discuss the practical implementation of the Gautschi-type method, which involves the solution of certain saddle point problems. The theoretical results are verified by a numerical experiment for the wave equation with kinetic boundary conditions.
Cite
@article{arxiv.2505.22532,
title = {Gautschi-type and implicit-explicit integrators for constrained wave equations},
author = {R. Altmann and B. Dörich and C. Zimmer},
journal= {arXiv preprint arXiv:2505.22532},
year = {2025}
}