Method of Computation of the Reynolds Number for Two Models of Lattice Gas Involving Violation of Semi-detailed Balance

We show how the theory of latt ice gases developed by Frisch, d'Humi eres, Hasslacher, Lallemand, Pomeau, and Rivet, can be extended to cases involving viola.tion of semi-detailed balance. T his allows further redu ction of the viscosit y. However , since t he universality of the distribution is lost , t he function g(p ) becomes dependent on th e collision laws and has to be evaluated by a suit able general. ization of the work of Henon on viscosit ies. Cases with and without rest part icles are considered. The lat tice Boltzmann approximation is used.