Abstract
The direct simulation Monte Carlo (DSMC) method is widely used for simulations of rarefied gas flows. Collisions of diatomic molecules have been investigated numerically in order to make a vibrational relaxation model of diatomic molecules for the DSMC method. The collision cross section for vibrational relaxation was described as a function of the relative translational, the rotational and the vibrational energies of the colliding molecules. The collision cross section was evaluated with the Monte Carlo integration for these parameters. A collision was simulated by the Semiclassical approach in which the vibrational motion was treated quantum mechanically and the rotational and the relative translational ones are treated classically. The transition rate coefficients agreed well with former researches. The collision cross section for the collinear collision was modeled as a function of the relative translational energy of the colliding pair.
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