Simulations at kinetic scale of relaxation models for slow and fast chemical reactions

Two BGK-type models for reactive gas mixtures, derived in a previous paper, are here considered. The former is related to slow reactions, whereas the latter takes into account fast chemical processes. The paper, through numerical simulations carried out at the kinetic level for both fast and slow bimolecular reactions, is mainly devoted to show the characteristic behavior and features of the two corresponding chemical regimes