Volume 5, Issue 4
Construction of Boundary Layer Elements for Singularly Perturbed Convection-diffusion Equations and L2-stability Analysis

C.-Y. Jung & R. Temam

DOI:

Int. J. Numer. Anal. Mod., 5 (2008), pp. 729-748.

Published online: 2008-05

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  • Abstract

It has been demonstrated that the ordinary boundary layer elements play an essential role in the finite element approximations for singularly perturbed problems producing ordinary boundary layers. Here we revise the element so that it has a small compact support and hence the resulting linear system becomes sparse, more precisely, block tridiagonal. We prove the validity of the revised element for some singularly perturbed convection-diffusion equations via numerical simulations and via the H-1-approximation error analysis. Furthermore due to the compact structure of the boundary layer we are able to prove the L-2-stability analysis of the scheme and derive the L-2-error approximations.

  • Keywords

boundary layer boundary layer element finite elements singularly perturbed problem convection-diffusion stability enriched subspaces exponentially fitted splines

  • AMS Subject Headings

65N30 34D15 76N20

  • Copyright

COPYRIGHT: © Global Science Press

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