A Stabilized Unfitted Space-time Finite Element Method for Parabolic Problems on Moving Domains
Abstract
This paper presents a space-time finite element method (FEM) based on an unfitted mesh for solving parabolic problems on moving domains. Unlike other unfitted space-time finite element approaches that commonly employ the discontinuous Galerkin (DG) method for time-stepping, the proposed method employs a fully coupled space-time discretization. To stabilize the time-advection term, the streamline upwind Petrov-Galerkin (SUPG) scheme is applied in the temporal direction. A ghost penalty stabilization term is further incorporated to mitigate the small cut issue, thereby ensuring the well-conditioning of the stiffness matrix. Moreover, an a priori error estimate is derived in a discrete energy norm, which achieves an optimal convergence rate with respect to the mesh size. In particular, a space-time Poincare-Friedrichs inequality is established to support the condition number analysis. Several numerical examples are provided to validate the theoretical findings.
Cite
@article{arxiv.2511.10242,
title = {A Stabilized Unfitted Space-time Finite Element Method for Parabolic Problems on Moving Domains},
author = {Ruizhi Wang and Weibing Deng},
journal= {arXiv preprint arXiv:2511.10242},
year = {2026}
}