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Efficient preconditioners for a shock capturing space-time discontinuous Galerkin method for systems of conservation laws

by A. Hiltebrand and S. Mishra

(Report number 2014-04)

Abstract
An entropy stable fully discrete shock capturing space-time Discontinuous Galerkin (DG) method was proposed in a recent paper [20] to approximate hyperbolic systems of conservation laws. This numerical scheme involves the solution of a very large nonlinear system of algebraic equations, by a Newton-Krylov method, at every time step. In this paper, we design efficient preconditioners for the large, non-symmetric linear system, that needs to be solved at every Newton step. Two sets of preconditioners, one of the block Jacobi and another of the block Gauss-Seidel type are designed. Fourier analysis of the preconditioners reveals their robustness and a large number of numerical experiments are presented to illustrate the gain in efficiency that results from preconditioning. The resulting method is employed to compute approximate solutions of the compressible Euler equations, even for very high CFL numbers.

Keywords: preconditioner, discontinuous Galerkin, space-time, shock capturing, system of conservation laws

@Techreport{HM14_554,
  author = {A. Hiltebrand and S. Mishra},
  title = {Efficient preconditioners for a shock capturing space-time discontinuous Galerkin method for systems of conservation laws},
  institution = {Seminar for Applied Mathematics, ETH Z{\"u}rich},
  number = {2014-04},
  address = {Switzerland},
  url = {https://www.sam.math.ethz.ch/sam_reports/reports_final/reports2014/2014-04.pdf },
  year = {2014}
}

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