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A New Direct Discontinuous Galerkin Method with Symmetric Structure for Nonlinear Diffusion Equations

A New Direct Discontinuous Galerkin Method with Symmetric Structure for Nonlinear Diffusion Equations
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Year:    2013

Journal of Computational Mathematics, Vol. 31 (2013), Iss. 6 : pp. 638–662

Abstract

In this paper we continue the study of discontinuous Galerkin finite element methods for nonlinear diffusion equations following the direct discontinuous Galerkin (DDG) methods for diffusion problems [17] and the direct discontinuous Galerkin (DDG) methods for diffusion with interface corrections [18]. We introduce a numerical flux for the test function, and obtain a new direct discontinuous Galerkin method with symmetric structure. Second order derivative jump terms are included in the numerical flux formula and explicit guidelines for choosing the numerical flux are given. The constructed scheme has a symmetric property and an optimal $L^2(L^2)$ error estimate is obtained. Numerical examples are carried out to demonstrate the optimal $(k+1)$th order of accuracy for the method with $P^k$ polynomial approximations for both linear and nonlinear problems, under one-dimensional and two-dimensional settings.

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Journal Article Details

Publisher Name:    Global Science Press

Language:    English

DOI:    https://doi.org/10.4208/jcm.1307-m4273

Journal of Computational Mathematics, Vol. 31 (2013), Iss. 6 : pp. 638–662

Published online:    2013-01

AMS Subject Headings:   

Copyright:    COPYRIGHT: © Global Science Press

Pages:    25

Keywords:    Discontinuous Galerkin Finite Element method Diffusion equation Stability Convergence.

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