  We describe results of computer simulations of steady state heat transport in
a fluid of hard discs undergoing both elastic interparticle collisions and
velocity randomizing collisions which do not conserve momentum. The system
consists of N discs of radius r in a unit square, periodic in the y-direction
and having thermal walls at x = 0 with temperature T0 taking values from 1 to
20 and at x = 1 with T1 = 1. We consider different values of the ratio between
randomizing and interparticle collision rates and extrapolate results from
different N, to N->infinity, r->0 such that rho=1/2. We find that in the
(extrapolated) limit N->infinity, the systems local density and temperature
profiles are those of local thermodynamic equilibrium (LTE) and obey Fourier's
law. The variance of global quantities, such as the total energy, deviates from
its local equilibrium value in a form consistent with macroscopic fluctuation
theory.
