State Resolved Thermochemical Modeling of Nitrogen Using DSMC

State-resolved analyses of N+N2 are performed using the direct simulation Monte Carlo (DSMC) method. In describing the elastic collisions in a state-resolved method, a statespecific total cross section is proposed. The state-resolved model is constructed from the state-specific total cross section and the state-to-state transition cross sections for boundbound and bound-free transitions taken from a NASA database. This approach makes it possible to analyze the rotation-to-translation, vibration-to-translation, and rotation-tovibration energy transfer and the chemical reactions without relying on a phenomenological model. In nonequilibrium heat bath and 2-D cylindrical flow, the DSMC calculations by the state-resolved model are compared with those obtained with previous DSMC models and master equation calculations. In these previous DSMC models, the VSS, phenomenological LB, QK, and TCE models are considered. From these studies, it is concluded that the present state-resolved model more accurately describes the rotational and vibrational relaxation and chemical processes than the other previous DSMC models.