Journal
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
Volume 191, Issue 31, Pages 3369-3390Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0045-7825(02)00253-0
Keywords
kinetic theory; Monte-Carlo simulation; random particle models; BGK equations
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Rarefied gas flows obey the Boltzmann equation, but numerical simulations of this equation are not always possible, so that simpler models have been introduced. The ES-BGK equation is one of these models. It gives the correct transport coefficients for the Navier-Stokes approximation, so that Boltzmann or ES-BGK simulations are expected to give the same results for dense gases, but in the case of a rarefied flow, complete numerical comparisons are needed. In this paper we present numerical comparisons between the two models in transitional regimes (where the ES-BGK model is expected to be useful) for reentry flows around a compression ramp and a plate. We also emphasize that the ES-BGK model gives flow predictions closer to the Boltzmann result than the simpler BGK model. (C) 2002 Elsevier Science B.V. All rights reserved.
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