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A cut finite element method for elliptic bulk problems with embedded surfaces
Mathematics, University College London, London, United Kingdom.
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.ORCID iD: 0000-0001-7352-1550
Mathematics and Mathematical Statistics, Umeå University, Umeå, Sweden.
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.ORCID iD: 0000-0002-2875-8433
2019 (English)In: GEM - International Journal on Geomathematics, ISSN 1869-2672, E-ISSN 1869-2680, Vol. 10, no 1, article id 10Article in journal (Refereed) Published
Abstract [en]

We propose an unfitted finite element method for flow in fractured porous media. The coupling across the fracture uses a Nitsche type mortaring, allowing for an accurate representation of the jump in the normal component of the gradient of the discrete solution across the fracture. The flow field in the fracture is modelled simultaneously, using the average of traces of the bulk variables on the fractures. In particular the Laplace–Beltrami operator for the transport in the fracture is included using the average of the projection on the tangential plane of the fracture of the trace of the bulk gradient. Optimal order error estimates are proven under suitable regularity assumptions on the domain geometry. The extension to the case of bifurcating fractures is discussed. Finally the theory is illustrated by a series of numerical examples. 

Place, publisher, year, edition, pages
Springer, 2019. Vol. 10, no 1, article id 10
Keywords [en]
Embedded, Finite element, Fractures, Unfitted, Fracture, Porous materials, Domain geometry, Embedded surfaces, Fractured porous media, Normal component, Optimal order error estimates, Regularity assumption, Finite element method
National Category
Computational Mathematics
Identifiers
URN: urn:nbn:se:hj:diva-43354DOI: 10.1007/s13137-019-0120-zISI: 000463142200001PubMedID: 30873244Scopus ID: 2-s2.0-85061086676Local ID: HOA JTH 2019;JTHMaterialISOAI: oai:DiVA.org:hj-43354DiVA, id: diva2:1297379
Available from: 2019-03-19 Created: 2019-03-19 Last updated: 2021-09-07Bibliographically approved
In thesis
1. Finite Element Methods for Interface Problems
Open this publication in new window or tab >>Finite Element Methods for Interface Problems
2019 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis focuses on computationally efficient methods for flow in fractured porous media. Two approaches are presented where the interface is embedded on the underlying finite element mesh. The methods allow for representation of the interface geometry from the underlying discretization and with discontinuities across the interface. However, embedding interfaces raises stability concerns in which we alleviate using stabilization terms. The aim of this thesis is to present the basics of the two main approaches and to provide brief details on the mathematics involved.

Abstract [sv]

Denna avhandling fokuserar på effektiva beräkningsmetoder för flöde i porösa media med sprickor. Två tillvägagångssätt presenteras där sprickan tillåts skära det underliggande finita elementnätet. Sprickans inverkan på flödet tas om hand med hjälp av den underliggande diskretiseringen som tillåter diskontinuiteter. Med andra ord kan flöden modelleras med olika egenskaper; på var sida av sprickan, samt längs sprickan. Metoden tar även hand om instabilitet som uppstår dels på grund av godtyckliga skärningar av bakgrundselementen och dels på grund av olika materialegenskaper. Syftet med denna avhandling är att presentera grunderna för dessa metoder och ge grundläggande matematiska förklaringar.

Place, publisher, year, edition, pages
Jönköping: Jönköping University, School of Engineering, 2019. p. 45
Series
JTH Dissertation Series ; 44
Keywords
Finite Element Method, Interface, Embedded, CutFEM, Finita elementmetoden, Sprickor, CutFEM
National Category
Computational Mathematics Materials Engineering
Identifiers
urn:nbn:se:hj:diva-54570 (URN)978-91-87289-47-7 (ISBN)
Supervisors
Funder
Swedish Foundation for Strategic Research , AM13-0029
Available from: 2021-09-07 Created: 2021-09-07 Last updated: 2021-09-07Bibliographically approved

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Hansbo, PeterSamvin, David

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