Studies on rarefied gas flows via an accurate finite-difference analysis of the Boltzmann equation

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(1) Steady behavior of a free-molecular gas(a highly rarefied gas in which the molecular collisions can be neglected) between parallel plates with non-uniform temperature is analyzed to clarify the dependence of the flow field on the boundary condition. Moreover, a new example where no steady flow is induced is investigated.(2) The behavior of Io's atmosphere is studied via a finite-difference analysis of a model Boltzmann equation. Unsteady flows caused by condensation and sublimation of sulfur dioxide(the main component of the atmosphere) during and after eclipse are obtained.