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A Stabilized Cut Finite Element Method for the Three Field Stokes Problem
University College London.
University College London.
Simula Res Lab, Fornebu, Norway.ORCID-id: 0000-0003-0803-9041
2015 (Engelska)Ingår i: SIAM Journal on Scientific Computing, ISSN 1064-8275, E-ISSN 1095-7197, Vol. 37, nr 4, s. A1705-A1726Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We propose a Nitsche-based fictitious domain method for the three field Stokes problem in which the boundary of the domain is allowed to cross through the elements of a fixed background mesh. The dependent variables of velocity, pressure, and extra-stress tensor are discretized on the background mesh using linear finite elements. This equal order approximation is stabilized using a continuous interior penalty (CIP) method. On the unfitted domain boundary, Dirichlet boundary conditions are weakly enforced using Nitsche's method. We add CIP-like ghost penalties in the boundary region and prove that our scheme is inf-sup stable and that it has optimal convergence properties independent of how the domain boundary intersects the mesh. Additionally, we demonstrate that the condition number of the system matrix is bounded independently of the boundary location. We corroborate our theoretical findings numerically.

Ort, förlag, år, upplaga, sidor
2015. Vol. 37, nr 4, s. A1705-A1726
Nyckelord [en]
three field Stokes, continuous interior penalty, fictitious domain, cut finite element method, ghost penalty, Nitsche’s method, viscoelasticity
Nationell ämneskategori
Beräkningsmatematik
Identifikatorer
URN: urn:nbn:se:umu:diva-130970DOI: 10.1137/140983574ISI: 000360698000004OAI: oai:DiVA.org:umu-130970DiVA, id: diva2:1070644
Tillgänglig från: 2017-02-01 Skapad: 2017-02-01 Senast uppdaterad: 2018-06-09

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