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

(1) 分析了非均匀温度平行板之间自由分子气体（一种高度稀薄的气体，其中分子碰撞可以忽略不计）的稳态行为，以阐明流场对边界条件的依赖性。此外，还研究了一个不引起稳定流的新例子。(2)通过模型玻尔兹曼方程的有限差分分析研究了木卫一大气的行为。得到了食时和食后二氧化硫（大气的主要成分）凝结和升华引起的非定常流动。

(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.