Accession Number : ADA329509

Title :   The Local Discontinuous Galerkin Method for Time-Dependent Convection-Diffusion Systems.

Descriptive Note : Research paper.

Corporate Author : INSTITUTE FOR COMPUTER APPLICATIONS IN SCIENCE AND ENGINEERING HAMPTON VA

Personal Author(s) : Cockburn, Bernardo ; Shu, Chi-Wang

PDF Url : ADA329509

Report Date : JUL 1997

Pagination or Media Count : 38

Abstract : In this paper, we study the Local Discontinuous Galerkin methods for non-linear, time-dependent convection-diffusion systems. These methods are an extension of the Runge-Kutta Discontinuous Galerkin methods for purely hyperbolic systems to convection-diffusion systems and share with those methods their high parallelizability, their high-order formal accuracy, and their easy handling of complicated geometries, for convection dominated problems. It is proven that for scalar equations, the Local Discontinuous Galerkin methods are L2-stable in the nonlinear case. Moreover, in the linear case, it is shown that if polynomials of degree k are used, the methods are k-th order accurate for general triangulations; although this order of convergence is suboptimal, it is sharp for the LDG methods. Preliminary numerical examples displaying the performance of the method are shown.

Descriptors :   *RUNGE KUTTA METHOD, *GALERKIN METHOD, CONVECTION, NONLINEAR SYSTEMS, PARTIAL DIFFERENTIAL EQUATIONS, CONVERGENCE, DIFFUSION, SCALAR FUNCTIONS.

Subject Categories : Statistics and Probability

Distribution Statement : APPROVED FOR PUBLIC RELEASE