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Cut finite element method for divergence-free approximation of incompressible flow: a lagrange multiplier approach
Department of Mathematics, University College London, London, United Kingdom.
Department of Materials and Manufacturing, Jönköping University, Jönköping, Sweden.
Umeå University, Faculty of Science and Technology, Department of Mathematics and Mathematical Statistics.ORCID iD: 0000-0001-5589-4521
2024 (English)In: SIAM Journal on Numerical Analysis, ISSN 0036-1429, E-ISSN 1095-7170, Vol. 62, no 2, p. 893-918Article in journal (Refereed) Published
Abstract [en]

In this note, we design a cut finite element method for a low order divergence-free element applied to a boundary value problem subject to Stokes' equations. For the imposition of Dirichlet boundary conditions, we consider either Nitsche's method or a stabilized Lagrange multiplier method. In both cases, the normal component of the velocity is constrained using a multiplier, different from the standard pressure approximation. The divergence of the approximate velocities is pointwise zero over the whole mesh domain, and we derive optimal error estimates for the velocity and pressures, where the error constant is independent of how the physical domain intersects the computational mesh, and of the regularity of the pressure multiplier imposing the divergence-free condition.

Place, publisher, year, edition, pages
Society for Industrial & Applied Mathematics (SIAM) , 2024. Vol. 62, no 2, p. 893-918
Keywords [en]
compatible finite elements, CutFEM, fictitious domain, incompressibility, Lagrange multipliers, Stokes' equations
National Category
Computational Mathematics
Identifiers
URN: urn:nbn:se:umu:diva-224182DOI: 10.1137/22M1542933ISI: 001197029500001Scopus ID: 2-s2.0-85191583237OAI: oai:DiVA.org:umu-224182DiVA, id: diva2:1858496
Available from: 2024-05-17 Created: 2024-05-17 Last updated: 2024-05-17Bibliographically approved

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Larson, Mats G.

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