State specific vibrational relaxation and dissociation models for nitrogen in shock wave regions

Zheng Li, Ilyoup Sohn, Deborah A. Levin

Research output: Chapter in Book/Report/Conference proceedingConference contribution


This work studies the interaction of the DSMC vibrational relaxation models and dissociation of molecular nitrogen at moderate Mach numbers where such processes are important. The V-T transition models assessed include the discrete Larson-Borgnakke model and Forced Harmonic Oscillator (FHO). The total collision energy (TCE) and QCT models for the N2 dissociation reaction were considered and the dissociation from different N2 vibrational excited states was included in the simulations. It was found the vibrational temperature is higher with the FHO model compared to the LB approach since the FHO model has the higher effective vibrational relaxation rates. Furthermore the use of the QCT rates compared to the usual, TCE model gave a substantially higher degree of dissociation and smaller shock width.

Original languageEnglish (US)
Title of host publication43rd AIAA Thermophysics Conference 2012
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Print)9781624101861
StatePublished - 2012
Externally publishedYes
Event43rd AIAA Thermophysics Conference 2012 - New Orleans, LA, United States
Duration: Jun 25 2012Jun 28 2012

Publication series

Name43rd AIAA Thermophysics Conference 2012


Conference43rd AIAA Thermophysics Conference 2012
Country/TerritoryUnited States
CityNew Orleans, LA

ASJC Scopus subject areas

  • Aerospace Engineering
  • Mechanical Engineering
  • Condensed Matter Physics


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