Campus Units

Mechanical Engineering

Document Type

Article

Publication Version

Submitted Manuscript

Publication Date

9-1-2016

Journal or Book Title

Computer Methods in Applied Mechanics and Engineering

Volume

309

First Page

625

Last Page

652

DOI

10.1016/j.cma.2016.06.026

Abstract

We explore the use of the non-symmetric Nitsche method for the weak imposition of boundary and coupling conditions along interfaces that intersect through a finite element mesh. In contrast to symmetric Nitsche methods, it does not require stabilization and therefore does not depend on the appropriate estimation of stabilization parameters. We first review the available mathematical background, recollecting relevant aspects of the method from a numerical analysis viewpoint. We then compare accuracy and convergence of symmetric and non-symmetric Nitsche methods for a Laplace problem, a Kirchhoff plate, and in 3D elasticity. Our numerical experiments confirm that the non-symmetric method leads to reduced accuracy in the L2" role="presentation"> error, but exhibits superior accuracy and robustness for derivative quantities such as diffusive flux, bending moments or stress. Based on our numerical evidence, the non-symmetric Nitsche method is a viable alternative for problems with diffusion-type operators, in particular when the accuracy of derivative quantities is of primary interest.

Comments

This is a manuscript of an article published as Schillinger, Dominik, Isaac Harari, Ming-Chen Hsu, David Kamensky, Stein KF Stoter, Yue Yu, and Ying Zhao. "The non-symmetric Nitsche method for the parameter-free imposition of weak boundary and coupling conditions in immersed finite elements." Computer Methods in Applied Mechanics and Engineering 309 (2016): 625-652. DOI: 10.1016/j.cma.2016.06.026. Posted with permission.

Copyright Owner

Elsevier B.V.

Language

en

File Format

application/pdf

Published Version

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