Publications

Molecular gas dynamics observations of Chapman-enskog behavior and departures therefrom in nonequilibrium gases

Gallis, Michail A.; Torczynski, J.R.; Rader, Daniel J.

The molecular velocity distribution of a gas with heat flow was analyzed using Bird's direct simulation Monte Carlo (DSMC) method. Large numbers of computational molecules represented the gas in DSMC. Chapman-Enskog behavior was obtained for inverse-power-law molecules at continuum nonequilibrium conditions. It was shown that the Sonine-polynomial coefficients differ systematically from their continuum values as the local Knudsen number is increased, at noncontinuum nonequilibrium conditions.