A BGK model for high temperature rarefied gas flows
Langue
en
Article de revue
Ce document a été publié dans
European Journal of Mechanics - B/Fluids. 2020-03, vol. 80, p. 1-12
Elsevier
Résumé en anglais
High temperature gases, for instance in hypersonic reentry flows, show complex phenomena like excitation of rotational and vibrational energy modes, and even chemical reactions. For flows in the continuous regime, simulation ...Lire la suite >
High temperature gases, for instance in hypersonic reentry flows, show complex phenomena like excitation of rotational and vibrational energy modes, and even chemical reactions. For flows in the continuous regime, simulation codes use analytic or tabulated constitutive laws for pressure and temperature. In this paper, we propose a BGK model which is consistent with any arbitrary constitutive laws, and which is designed to make high temperature gas flow simulations in the rarefied regime. A Chapman-Enskog analysis gives the corresponding transport coefficients. Our approach is illustrated by a numerical comparison with a compressible Navier-Stokes solver with rotational and vibrational non equilibrium. The BGK approach gives a deterministic solver with a computational cost which is close to that of a simple monoatomic gas.< Réduire
Mots clés en anglais
polyatomic gas
BGK model
second principle
real gas effect
rarefied gas dynamics
Origine
Importé de halUnités de recherche