Mechanism reduction for rovibrational energy excitation and dissociation of molecular nitrogen in hypersonic flows

Alessandro Munafó, Marco Panesi, Richard Jaffe, Anne Bourdon, Thierry Magin

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


A coarse-grain collisional model has been developed to study molecular nitrogen internal energy excitation and dissociation behind shock waves and in nozzle flows. The starting point is the rovibrational collisional model recently developed at NASA Ames Research Center consisting in reaction rate coefficients obtained from ab initio calculations. The master equation for this model has been already coupled with a one-dimensional inviscid flow solver for the investigation of nonequilibrium effects behind shock waves by assuming a uniform distribution of energy levels in energy bins. In the present work, we propose a coarse-grain model based on a Boltzmann distribution of energy levels within a bin. Applications are presented both for normal shock waves and nozzle flows. Governing equations are solved by means of Finite volume method and, for shock waves, dissipation effects are also taken into account. Computational results are compared against those obtained by means of multi-temperature models and a vibrational collisional model already developed from the same ab initio database.

Original languageEnglish (US)
Title of host publication42nd AIAA Thermophysics Conference
StatePublished - Dec 1 2011
Externally publishedYes
Event42nd AIAA Thermophysics Conference 2011 - Honolulu, HI, United States
Duration: Jun 27 2011Jun 30 2011

Publication series

Name42nd AIAA Thermophysics Conference


Other42nd AIAA Thermophysics Conference 2011
Country/TerritoryUnited States
CityHonolulu, HI

ASJC Scopus subject areas

  • Aerospace Engineering
  • Mechanical Engineering
  • Condensed Matter Physics


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