Analysis of chemistry models for DSMC simulations of the atmosphere of Io

Hao Deng, T. Ozawa, D. A. Levin

Research output: Contribution to journalConference articlepeer-review


In order to study the planetary atmosphere of Io, a moon of Jupiter, the chemical reaction rate between SO 2 and O obtained using the Molecular Dynamic/Quasi-Classical Trajectory (MD/QCT) method are compared with other sources and the Total Collisional Energy (TCE) model of Bird. The MD/QCT calculations are found to result in lower rate constants and reaction probabilities than the TCE model in the temperature range of 6,000 K and above and also reveal the vibrational favoring feature of the reaction SO 2 + O → SO + 2O. The implementation of both MD/QCT and TCE chemistry reaction models in DSMC is examined through the analysis of the 0-D time dependant and 2-D axi-symmetric DSMC simulations. The difference between the MD/QCT and TCE models is observed in the reaction product contours in the 2-D problem. The lower rate constant and reaction probability predicted by the MD/QCT model compared to the TCE model creates a smaller reaction region in the 2-D axi-symmetric simulation, lower product concentration, and higher temperature. In addition, the reaction region is found to be highly non-equilibrium, which suggests that MD/QCT is a more suitable model for the simulation of the Io's atmosphere.

Original languageEnglish (US)
Pages (from-to)1055-1060
Number of pages6
JournalAIP Conference Proceedings
StatePublished - 2009
Externally publishedYes
Event26th International Symposium on Rarefied Gas Dynamics, RGD26 - Kyoto, Japan
Duration: Jul 20 2008Jul 25 2008


  • DSMC
  • Io
  • Rate constant
  • Reaction probability

ASJC Scopus subject areas

  • General Physics and Astronomy


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