| 講演要旨： |
In the thin atmospheres of small planets and the upper atmospheres of the larger planets a broad spectrum of continuum to free molecular flows occur. The flows of present interest involve plumes and impact events as well as sublimation-condensation driven convection and contain a very broad range of physics including: radiative transfer, quantized energy transfer, entrained particulates, phase change (particle condensation and sublimation), gas interaction with plasma, electro-magnetic fields, three-dimensionality, unsteadiness, uncommon gas species, and more. We present our attempts to use DSMC, free-molecular and electron-transport approaches to address some of these modeling challenges. The talk will discuss computational techniques both within DSMC and using DSMC-like approaches in other codes. Unlike the case of an engineering application where simulations are made of a controlled (repeatable) experiment, the present simulations are meant to model remote and generally un-repeatable observations. Results will be presented by way of comparison to observations obtained by the Voyager, Galileo, Cassini and Hubble Space Telescope missions. |
