We consider a non reactive multi component gas mixture.We pro- pose a class of models, which can be easily generalized to multiple species. The two species mixture is modelled by a system of kinetic BGK equations featuring two interaction terms to account for momentum and energy transfer between the species.We prove consistency of our model: conservation proper- ties, positivity of the solutions for the space homogeneous case, positivity of all temperatures, H-theorem and convergence to a global equilibrium in the space homogeneous case in the form of a global Maxwell distribution. Thus, we are able to derive the usual macroscopic conservation laws. In particular, by considering a mixture composed of ions and electrons, we derive the macroscopic equations of ideal MHD from our model.

A consistent kinetic model for a two-component mixture with an application to plasma

PUPPO, GABRIELLA ANNA
2017

Abstract

We consider a non reactive multi component gas mixture.We pro- pose a class of models, which can be easily generalized to multiple species. The two species mixture is modelled by a system of kinetic BGK equations featuring two interaction terms to account for momentum and energy transfer between the species.We prove consistency of our model: conservation proper- ties, positivity of the solutions for the space homogeneous case, positivity of all temperatures, H-theorem and convergence to a global equilibrium in the space homogeneous case in the form of a global Maxwell distribution. Thus, we are able to derive the usual macroscopic conservation laws. In particular, by considering a mixture composed of ions and electrons, we derive the macroscopic equations of ideal MHD from our model.
BGK approximation; Kinetic model; Multiuid mixture; Plasma flow;
Klingenberg, Christian; Pirner, Marlies; Puppo, GABRIELLA ANNA
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11383/2059534
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