Abstract
We proposed a new rotational relaxation model for polyatomic molecules in nonequilibrium rarefied gas flow, which is based on dynamic molecular collision (DMC) model for diatomic molecules. The classical trajectory calculation (CTC) was conducted to simulate a large number of binary collisions in various conditions. Here, the pair potential model derived from the ab initio calculations was used for the intermolecular potential energy, while the molecules are regarded as rigid rotors. From the statistical analysis of the CTC, we found the probability density function of the translational/rotational energy transfer was expressed by the single exponential law as well as the DMC model. And we applied this model to the DSMC calculation and demonstrated the temperature relaxation.
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