A semi-Lagrangian discontinuous Galerkin (DG) – local DG method for solving convection-diffusion equations

Mingchang Ding, Xiaofeng Cai, Wei Guo, Jing Mei Qiu

Research output: Contribution to journalArticle

Abstract

In this paper, we propose an efficient high order semi-Lagrangian (SL) discontinuous Galerkin (DG) method for solving linear convection-diffusion equations. The method generalizes our previous work on developing the SLDG method for transport equations [5], making it capable of handling additional diffusion and source terms. Within the DG framework, the solution is evolved along the characteristics; while the diffusion term is discretized by the local DG (LDG) method and integrated along characteristics by implicit Runge-Kutta methods together with source terms. The proposed method is named the ‘SLDG-LDG’ method and enjoys many attractive features of the DG and SL methods. These include the uniformly high order accuracy (e.g. third order) in space and in time, compact, mass conservative, and stability under large time stepping size. An L2 stability analysis is provided when the method is coupled with the first order backward Euler discretization. Effectiveness of the method are demonstrated by a group of numerical tests in one and two dimensions.

Original languageEnglish
Article number109295
JournalJournal of Computational Physics
Volume409
DOIs
StatePublished - May 15 2020

Keywords

  • Convection-diffusion equation
  • Discontinuous Galerkin (DG) method
  • Implicit Runge-Kutta method
  • Local DG method
  • Semi-Lagrangian
  • Stability analysis

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