Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...469..393m&link_type=abstract
Astrophysical Journal v.469, p.393
Astronomy and Astrophysics
Astronomy
9
Hydrodynamics, Planets And Satellites: General
Scientific paper
The atmosphere of an intermediate mass planetary body is calculated in a self-consistent fashion by the use of a hybrid fluid/kinetic theory approach on massively parallel computers. Assuming a spherical atmosphere and a heating layer, this technique is used to obtain the atmosphere from the collisional hydrodynamic regime, through the quasi-collisional nonlinear kinetic regime, and into the self-collisionless linear kinetic regime. The results display significant nonequilibrium phenomena in both macroscopic variables such as temperature and microscopic variables such as the velocity distribution. Comparison with a standard hydrodynamic model demonstrates substantial differences. This method which is valid for all Knudsen numbers can be easily generalized to more complex problems and should be a powerful tool to study the structure, dynamics, and evolution of planetary atmospheres.
Dagum L.
Marconi Max L.
Smyth William H.
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