KNM MFF UK

Department of Numerical Mathematics Faculty of Mathematics and Physics Charles University

Residual based error estimates for the space-time discontinuous Galerkin method applied to the compressible flows

  • ID: 2694, RIV: 10301815
  • ISSN: 0045-7930, ISBN: not specified
  • source: Computers and Fluids
  • keywords: Space-time discontinuous Galerkin method; Compressible Navier-Stokes equations; Nonlinear algebraic problems; Residual error estimates
  • authors: Vít Dolejší, Filip Roskovec, Miloslav Vlasák
  • authors from KNM: Dolejší Vít, Vlasák Miloslav, Roskovec Filip

Abstract

We develop an adaptive numerical method for solution of the non-stationary compressible Navier-Stokes equations. This method is based on the space-time discontinuous Galerkin discretization, which employs high polynomial approximation degrees with respect to the space as well as to the time coordinates. We focus on the identification of the computational errors, following from the space and time discretizations and from the inexact solution of the arising nonlinear algebraic systems. We derive the residual-based error estimates approximating these errors. Then we propose an efficient algorithm which brings the algebraic, spatial and temporal errors under control. The computational performance of the proposed method is demonstrated by numerical experiments.