On weak Dirichlet boundary conditions for elliptic problems in the continuous Galerkin method
File(s)weak_bc_rg.pdf (1.99 MB)
Accepted version
Author(s)
Vymazal, Martin
Moxey, David
Cantwell, Chris D
Sherwin, Spencer J
Kirby, Robert M
Type
Journal Article
Abstract
We combine continuous and discontinuous Galerkin methods in the setting of a model diffusion problem. Starting from a hybrid discontinuous formulation, we replace element interiors by more general subsets of the computational domain – groups of elements that support a piecewise-polynomial continuous expansion. This step allows us to identify a new weak formulation of Dirichlet boundary condition in the continuous framework. We show that the boundary condition leads to a stable discretization with a single parameter insensitive to mesh size and polynomial order of the expansion. The robustness of the approach is demonstrated on several numerical examples.
Date Issued
2019-10-01
Date Acceptance
2019-05-17
Citation
Journal of Computational Physics, 2019, 394, pp.732-744
ISSN
0021-9991
Publisher
Elsevier
Start Page
732
End Page
744
Journal / Book Title
Journal of Computational Physics
Volume
394
Copyright Statement
© 2019 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000478572700036&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Technology
Physical Sciences
Computer Science, Interdisciplinary Applications
Physics, Mathematical
Computer Science
Physics
High-order
Navier-Stokes equations
Weakly imposed boundary conditions
Fluids
DISCONTINUOUS GALERKIN
IMPOSITION
HDG
CG
Publication Status
Published
Date Publish Online
2019-05-30