Generation of a hybrid DSMC/CFD solution for gas mixtures with internal degrees of freedom

Kelly A. Stephani, David B. Goldstein, Philip L. Varghese

Research output: Contribution to conferencePaperpeer-review

Abstract

A consistent approach for generating a hybrid DSMC/CFD solution is presented for re-entry applications involving neutral gas mixtures with internal energy. A quality hybrid solution requires consistency in the thermo-chemical models employed by the particle (DSMC) and continuum (CFD) solvers, as well as an appropriate boundary condition for the transfer of flux information across the hybrid interface. The first half of this work focuses on achieving consistency in the transport properties obtained by particle and continuum solvers, including species diffusion, viscosity and translational and internal thermal conductivities for a five-species air mixture. In the second portion, a new approach for the generation of particles at a hybrid interface is presented for gas mixtures with internal degrees of freedom. Particle thermal velocities and internal energies are prescribed from the appropriate non-equilibrium (perturbed) distribution, in which diffusion, shear stress and heat flux terms are included in the Generalized Chapman-Enskog formulation of the perturbation. The significance of the contributions from these terms on the perturbation are examined at a hybrid interface within non-equilibrium boundary layer flow, as well as within the breakdown region near a normal shock, in a five-species air gas mixture. The validity of the Chapman-Enskog perturbation at each of these hybrid interfaces is assessed by comparison with the Generalized Chapman-Enskog perturbations.

Original languageEnglish (US)
DOIs
StatePublished - 2012
Externally publishedYes
Event50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition - Nashville, TN, United States
Duration: Jan 9 2012Jan 12 2012

Other

Other50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition
CountryUnited States
CityNashville, TN
Period1/9/121/12/12

ASJC Scopus subject areas

  • Aerospace Engineering

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