  The relativistic shock layer problem was numerically analyzed by using two
relativistic Boltzmann-kinetic equations. One is Marle model, and the other is
Anderson-Witting model. As with Marle model, the temperature of the gain term
was determined from its relation with the dynamic pressure in the framework of
14-moments theory. From numerical results of the relativistic shock layer
problem, behaviors of projected moments in the nonequilibrium region were
clarified. Profiles of the heat flux given by Marle model and Anderson-Witting
model were quite adverse to the profile of the heat flux approximated by
Navier-Stokes-Fourier law. On the other hand, profiles of the heat flux given
by Marle model and Anderson-Witting model were similar to the profile
approximated by Navier-Stokes-Fourier law. Additionally we discuss the
differences between Anderson-Witting model and Marle model by focusing on the
fact that the relaxational rate of the distribution function depends on both
flow velocity and molecular velocity for Anderson-Witting model, while it
depends only on the molecular velocity for Marle model.
