Search for: [Abstract = "A discrete kinetic model is proposed which has some properties typical for retrograde gases. The characteristic feature of the model is that the probabilities of direct and inverse collisions are not symmetric. The Euler and Navier\-Stokes equations corresponding to the proposed model are derived. The plane shock wave is studied by means of these three types of equations. It is found that in some cases the number density must decrease in order for the shock to be stable. The transition line is shown to be the same for the Boltzmann and Navier\-Stokes model equations and, in the case of weak shocks, it coincides with that found from the Euler model equations."]

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