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Lagrangian and moving mesh methods for the convection diffusion equation

Published online by Cambridge University Press:  12 January 2008

Konstantinos Chrysafinos
Affiliation:
: Department of Mathematics, National Technical University of Athens, Zografou Campus, 15780 Athens, Greece. chrysafinos@ins.uni-bonn.deDepartment of Mathematics, Carnegie Mellon University, Pittsburgh, PA 15213 USA. noelw@cmu.edu
Noel J. Walkington
Affiliation:
Department of Mathematics, Carnegie Mellon University, Pittsburgh, PA 15213 USA. noelw@cmu.edu
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Abstract

We propose and analyze a semi Lagrangian method for the convection-diffusion equation. Error estimates for both semi and fully discrete finite element approximations are obtained for convection dominated flows. The estimates are posed in terms of the projections constructed in [Chrysafinos and Walkington, SIAM J. Numer. Anal. 43 (2006) 2478–2499; Chrysafinos and Walkington, SIAM J. Numer. Anal. 44 (2006) 349–366] and the dependence of various constants upon the diffusion parameter is characterized. Error estimates independent of the diffusion constant are obtained when the velocity field is computed exactly.

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Type
Research Article
Copyright
© EDP Sciences, SMAI, 2008

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