Rovibrationally state-specific collision model for the O₂(Σg−3) + O(P3) system in DSMC

A rovibrationally state-specific collision model for the O2(Σg−3)+O(P3) system is presented direct simulation Monte Carlo, including rotation–vibration–translation energy transfer, exchange, dissociation, and recombination processes. The two-step binary approach employed to reactions. Two available cross section databases by Andrienko/Boyd Esposito/Capitelli are resolved (rv-STS) vibrationally (v-STS), respectively. difference between rv-STS v-STS comes from two contributions: multisurface factor of dissociation (fMS) rotational averaging process. with constant fMS typically larger than variable fMS, especially low vibrational states. On other hand, sections resulting rotationally averaged database found underpredict rate coefficient at temperatures. In rovibrational heating case, predicts faster relaxation v-STS, which also shows a lower quasi-steady-state temperature v-STS. cooling presents thermal non-equilibrium translational mode during