Kinetic theory derivation of nonequilibrium hydrodynamic models for atmospheric entry plasmas
Friday, January 27, 3PM – 4PM
Thierry E. Magin
Atmospheric entry simulations are complex problems due to their intense multiphysics and multiscale nature. The conventional physicochemical nonequilibrium models used for these simulations are often derived "correlation-based" from experiments and stretched out of the validity range for which they have been conceived. We propose to use kinetic theory as a powerful tool to derive macroscopic conservation equations, transport fluxes, energy exchange terms and chemical production rates for atmospheric entry plasmas. Two approaches are followed: a multiscale Chapman-Enskog perturbative method and Boltzmann-moment system method with Grad closure. The following nonequilibrium effects are studied: mass disparity, electromagnetic field influence, ionization reactions, internal energy excitation, and rarefied gas effects.
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