High-order well-balanced schemes and applications to non-equilibrium flow

  • Authors:

  • Wei Wang;Chi-Wang Shu;H. C. Yee;Björn Sjögreen

  • Affiliations:

  • Center for Turbulence Research, Stanford University, Stanford, CA 94305, United States;Division of Applied Mathematics, Brown University, Providence, RI 02912, United States;NASA Ames Research Center, Moffett Field, CA 94035, United States;Lawrence Livermore National Laboratory, Livermore, CA 94551, United States

  • Venue:
  • Journal of Computational Physics
  • Year:
  • 2009

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Abstract

The appearance of the source terms in modeling non-equilibrium flow problems containing finite-rate chemistry or combustion poses additional numerical difficulties beyond that for solving non-reacting flows. A well-balanced scheme, which can preserve certain non-trivial steady state solutions exactly, may help minimize some of these difficulties. In this paper, a simple one-dimensional non-equilibrium model with one temperature is considered. We first describe a general strategy to design high-order well-balanced finite-difference schemes and then study the well-balanced properties of the high-order finite-difference weighted essentially non-oscillatory (WENO) scheme, modified balanced WENO schemes and various total variation diminishing (TVD) schemes. The advantages of using a well-balanced scheme in preserving steady states and in resolving small perturbations of such states will be shown. Numerical examples containing both smooth and discontinuous solutions are included to verify the improved accuracy, in addition to the well-balanced behavior.