Vibrational–translational energy exchange models for the direct simulation Monte Carlo method Journal Article uri icon



  • The model which controls the distribution of energy among the different molecular modes is a crucial component of accurate simulation of nonequilibrium rarefied flows. Two new models for the direct simulation Monte Carlo method that govern energy redistribution between the translational and vibrational modes are presented here. The first model is a modified form of the phenomenological Borgnakke–Larsen model. The probability of inelastic collision is evaluated using the relative velocity of collision. The second energy exchange model considered in this study is the multiple quantum-step transition model. The process of vibrational relaxation occurs through transitions between the different energy levels, allowing jumps of more than one level. Probabilities of activation and deactivation which depend on the relative velocity are used here. The new models are compared with existing schemes for several conditions. Significant differences are found for the vibrational energy distribution function computed in a hypersonic bow-shock wave.

publication date

  • August 1, 1999

has restriction

  • closed

Date in CU Experts

  • August 13, 2019 12:56 PM

Full Author List

  • Vijayakumar P; Sun Q; Boyd ID

author count

  • 3

Other Profiles

International Standard Serial Number (ISSN)

  • 1070-6631

Electronic International Standard Serial Number (EISSN)

  • 1089-7666

Additional Document Info

start page

  • 2117

end page

  • 2126


  • 11


  • 8