A sharp interface method using enriched finite elements for elliptic interface problems
type: Item
instance of: scholarly article
title: A sharp interface method using enriched finite elements for elliptic interface problems
zbMATH Open document ID: 1464.65176
author: Susanne Höllbacher
author: G. Wittum
published in: Numerische Mathematik
publication date: 2021-04-28T00:00:00Z
review text: Many applications in engineering and biology involve immersed interfaces moving in time within the computational domain. Interface problems are discretized using fitted or unfitted finite elements. The mesh generation process in the case of fitted elements for moving interfaces becomes expensive. In order to avoid expensive re-meshing, the immersed boundary method (IBM) of Peskin is used. In this paper, enriched finite element spaces are used which yield an interface fitted scheme for elliptic interface problems. The features of the interface are approximated properly by introducing local modifications, enrichments, or extensions of the finite element spaces. The derived immersed interface method avoids costly re-meshing. It was shown that the proposed method has the same order of approximation as comparable enriched methods for a general elliptic interface problem. Moreover, the discrete operator inherits the symmetry and positive definiteness of the continuous operator since it is a fitted method. The stability and convergence of the solution is proven and the numerical tests demonstrate optimal order of convergence. The method is compared with the enrichment of a CutFEM and of Peskins original IBM by looking at the local finite element spaces.
Mathematics Subject Classification ID: 65N30
Mathematics Subject Classification ID: 65N50
Mathematics Subject Classification ID: 65N12
Mathematics Subject Classification ID: 65F35
Mathematics Subject Classification ID: 35J15
Mathematics Subject Classification ID: 35A15
zbMATH DE Number: 7341054
zbMATH Keywords: finite elements
zbMATH Keywords: elliptic interface problems
zbMATH Keywords: conditioning
reviewed by: Bülent Karasözen
describes a project that uses: libAlgebra
describes a project that uses: libGrid
describes a project that uses: libDiscretization
describes a project that uses: pcl
describes a project that uses: UG4
MaRDI profile type: Publication
full work available at URL: s00211-021-01180-0
OpenAlex ID: W3135178871
Wikidata QID: Q114231032
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DOI: 10.1007/S00211-021-01180-0
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description: scientific article; zbMATH DE number 7341054