An Asymptotic-Preserving all-speed scheme for the Euler and Navier-Stokes equations

  • Authors:

  • Floraine Cordier;Pierre Degond;Anela Kumbaro

  • Affiliations:

  • CEA-Saclay DEN, DM2S, STMF, LMEC, F-91191 Gif-sur-Yvette, France and Université de Toulouse, UPS, INSA, UT1, UTM, Institut de Mathématiques de Toulouse, F-31062 Toulouse, France and CNRS ...;Université de Toulouse, UPS, INSA, UT1, UTM, Institut de Mathématiques de Toulouse, F-31062 Toulouse, France and CNRS, Institut de Mathématiques de Toulouse, UMR 5219, F-31062 Toulo ...;CEA-Saclay DEN, DM2S, STMF, LMEC, F-91191 Gif-sur-Yvette, France

  • Venue:
  • Journal of Computational Physics
  • Year:
  • 2012

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Abstract

We present an Asymptotic-Preserving 'all-speed' scheme for the simulation of compressible flows valid at all Mach-numbers ranging from very small to order unity. The scheme is based on a semi-implicit discretization which treats the acoustic part implicitly and the convective and diffusive parts explicitly. This discretization, which is the key to the Asymptotic-Preserving property, provides a consistent approximation of both the hyperbolic compressible regime and the elliptic incompressible regime. The divergence-free condition on the velocity in the incompressible regime is respected, and an the pressure is computed via an elliptic equation resulting from a suitable combination of the momentum and energy equations. The implicit treatment of the acoustic part allows the time-step to be independent of the Mach number. The scheme is conservative and applies to steady or unsteady flows and to general equations of state. One and two-dimensional numerical results provide a validation of the Asymptotic-Preserving 'all-speed' properties.