Dynamic Molecular Collision model for N 2 - He mixture

Takashi Tokumasu, Yoichiro Matsumoto, Kenjiro Kamijo, Mamoru Oike

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


Dynamic Molecular Collision (DMC) model is extended to calculate collisions of N2 and He. An intermolecular potential is obtained as the sum of the two potentials between each atom of a N2 molecule and He. Lennard-Jones (12-6) potential is used as the interatomic potential and potential parameters are determined by combination rule. N2-He collisions are simulated in many cases by Molecular Dynamics (MD) method in order to construct the collision model between N2 and He. A collision cross section is determined based on a diffusion coefficient and a probability density function of energy after collision is determined by the MD method. In the present paper, moreover, this model is applied to simulations of the free jet expansion of N2-He mixture by Direct Simulation Monte Carlo (DSMC) method and the flow field is analyzed. Especially the number density and energy distributions at the axis of a free jet are analyzed in detail.

Original languageEnglish
Title of host publicationRarefied Gas Dynamics
Subtitle of host publication22nd International Symposium
EditorsTimothy J. Bartel, Michael A. Gallis
PublisherAmerican Institute of Physics Inc.
Number of pages8
ISBN (Electronic)0735400253
Publication statusPublished - 2001 Aug 30
Event22nd International Symposium on Rarefied Gas Dynamics - Sydney, Australia
Duration: 2000 Jul 92000 Jul 14

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Other22nd International Symposium on Rarefied Gas Dynamics

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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