522	RWTH Publication No: 861858        2022        IGPM522.pdf
TITLE	An accurate and robust Eulerian finite element method for partial differential equations on evolving surfaces
AUTHORS	Hauke Sass, Arnold Reusken
ABSTRACT	In this paper we present a new Eulerian finite element method for the discretization of scalar partial differential equations on evolving surfaces. In this method we use the restriction of standard space-time finite element spaces on a fixed bulk mesh to the space-time surface. The structure of the method is such that it naturally fits to a level set representation of the evolving surface. The higher order version of the method is based on a space-time variant of a mesh deformation that has been developed in the literature for stationary surfaces. The discretization method that we present is of (optimal) higher order accuracy for smoothly varying surfaces with sufficiently smooth solutions. Without any modifications the method can be used for the discretization of problems with topological singularities. A numerical study demonstrates both the higher order accuracy for smooth cases and the robustness with respect to toplogical singularities.
KEYWORDS	surface partial differential equation, trace finite element method, space-time finite element method, unfitted finite element method
DOI	10.1016/j.camwa.2023.06.040
PUBLICATION	Computers & Mathematics with Applications, Volume 146, 15 September 2023, Pages 253-270