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A Fourth Order Cut Finite Element (cutFEM) Method for the Wave Equation using the Modifed Equation Approach
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Scientific Computing. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Numerical Analysis.ORCID iD: 0000-0003-1396-2287
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Numerical Analysis. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Scientific Computing.ORCID iD: 0000-0001-8865-8218
2026 (English)In: Journal of Scientific Computing, ISSN 0885-7474, E-ISSN 1573-7691, Vol. 109, no 1, article id 10Article in journal (Refereed) Published
Abstract [en]

A symmetric bilinear form corresponding to the biharmonic operator is combined with a corresponding bilinear form for the Laplacian to create a temporally 4th order corrected leap-frog scheme for the wave equation. The boundary conditions are imposed weakly, which allows for handling an unaligned domain with a stabilised cut-element methodology. The approach requires only one mass matrix solve per time-step. We develop fully discrete cutHermite and cutDG methodologies using cubic basis functions and Cartesian meshes. In the DG case additional symmetric interior penalties are added to impose sufficient continuity, while the higher continuity of the Hermite finite elements suffices. The schemes are shown to be stable under CFL conditions similar to the corresponding un-cut and un-corrected cases, and to yield 4th order accurate solutions. We also discuss how the biharmonic weak form can be used on its own to solve for example a biharmonic equation.

Place, publisher, year, edition, pages
Springer, 2026. Vol. 109, no 1, article id 10
Keywords [en]
finite element method, hermite interpolation, cutFEM, numerical analysis, discontinuous Galerkin, modified equation, leap-frog scheme
National Category
Computational Mathematics
Research subject
Mathematics
Identifiers
URN: urn:nbn:se:uu:diva-565873DOI: 10.1007/s10915-026-03331-7ISI: 001845015500004Scopus ID: 2-s2.0-105046946972OAI: oai:DiVA.org:uu-565873DiVA, id: diva2:1992446
Part of project
Immersed Hermite element method for wave equations, Swedish Research Council
Funder
Swedish Research Council, 2018-05279Available from: 2025-08-27 Created: 2025-08-27 Last updated: 2026-08-27Bibliographically approved
In thesis
1. Time-Step Analysis for cutHermite Finite Element Methods
Open this publication in new window or tab >>Time-Step Analysis for cutHermite Finite Element Methods
2025 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Hermite finite element methods, or Hermite FEM, use a set of basis functions that parameterise derivative values as well as function values at various points over a computational domain. This allows the use of function spaces that are continuous in derivatives as well as value over the computational domain. Doing this is shown to have computational benefits, such as allowing a larger stable time-step in time-dependent problems, and solving equations with higher spatial derivatives. This is particularly useful for modifying equations with higher derivative terms to increase the order of accuracy of a time-stepping scheme.

A limitation of these methods is that basis functions corresponding to derivatives in 2D or higher are more dependent on the shape of grid elements than basis functions corresponding to value. By using cut finite element methods (cutFEM), problems can be solved on domains without the exact shape of the domain being represented in the grid. This allows the benefits of Hermite FEM to be gained, without placing restrictions on the computational domain or deriving a new basis for every grid.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2025. p. 41
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 2579
Keywords
finite element method, Hermite interpolation, numerical analysis, wave equation, cutFEM, modified equation
National Category
Computational Mathematics
Research subject
Mathematics
Identifiers
urn:nbn:se:uu:diva-565886 (URN)978-91-513-2572-9 (ISBN)
Public defence
2025-10-24, Ångström house 10, room 101195 (Heinz-Otto Kreiss), Uppsala, 10:00 (English)
Opponent
Supervisors
Funder
Swedish Research Council, 2018- 05279
Available from: 2025-10-02 Created: 2025-08-27 Last updated: 2025-10-02

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Weber, IvyKreiss, Gunilla

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