Optimal a priori error estimates for the hp-version of the local discontinuous Galerkin method for convection-diffusion problems

Authors:
Paul Castillo;Bernardo Cockburn;Dominik Schötzau;Christoph Schwab
Affiliations:
-;-;-;-
Venue:
Mathematics of Computation
Year:
2002

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Abstract

We study the convergence properties of the hp-version of the local discontinuous Galerkin finite element method for convection-diffusion problems; we consider a model problem in a one-dimensional space domain. We allow arbitrary meshes and polynomial degree distributions and obtain upper bounds for the energy norm of the error which are explicit in the mesh-width h, in the polynomial degree p, and in the regularity of the exact solution. We identify a special numerical flux for which the estimates are optimal in both h and p. The theoretical results are confirmed in a series of numerical examples.