Numerical comparison between the Boltzmann and ES-BGK models for rarefied gases

Pierre Andries (1) , Jean-François Bourgat (1) , Patrick Le Tallec (1) , Benoît Perthame (1)

1 M3N - Multi-Models and Numerical Methods

Rarefied gas flows obey to 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.

Mots clés: BGK EQUATIONS; KINETIC THEORY; MONTE CARLO SIMULATION; RANDOM PARTICLE MODELS

Domaines: Autre [cs.OH]

Pierre Andries, Jean-François Bourgat, Patrick Le Tallec, Benoît Perthame. Numerical comparison between the Boltzmann and ES-BGK models for rarefied gases. [Research Report] RR-3872, INRIA. 2000. ⟨inria-00072782⟩