Hostname: page-component-7b7567c8c-tnzcf Total loading time: 0 Render date: 2026-11-13T21:05:38.652Z Has data issue: false hasContentIssue false

Moving Dirichlet boundary conditions∗

Published online by Cambridge University Press:  10 October 2014

Robert Altmann*
Affiliation:
Institut für Mathematik MA4-5, Technische Universität Berlin, Straße des 17. Juni 136, 10623 Berlin, Germany.. raltmann@math.tu-berlin.de

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the 'Save PDF' action button.

This paper develops a framework to include Dirichlet boundary conditions on a subset ofthe boundary which depends on time. In this model, the boundary conditions are weaklyenforced with the help of a Lagrange multiplier method. In order to avoid that the ansatzspace of the Lagrange multiplier depends on time, a bi-Lipschitz transformation, whichmaps a fixed interval onto the Dirichlet boundary, is introduced. An inf-sup condition aswell as existence results are presented for a class of second order initial-boundary valueproblems. For the semi-discretization in space, a finite element scheme is presented whichsatisfies a discrete stability condition. Because of the saddle point structure of theunderlying PDE, the resulting system is a DAE of index 3.

Information

Type
Research Article
Copyright
© EDP Sciences, SMAI 2014