  We simulate the formation and growth of disoriented chiral condensate (DCC)
regions which follow the expansion of a high energy density region into the
``cold'' vacuum. The numerical study is based on the one-loop effective
potential for the massive 2+1-dimensional Gross-Neveu model. We pay attention
to the setting of the initial conditions and to determining which parameters
are relevant for a strong amplification of the pion field. We find that the
size of the ``hot'' source plays a significant role. For large enough source
radii, we observe strong correlation phenomena, corresponding to the growth of
large regions where the pion field oscillates along a given direction. We give
our results in terms of the $\theta$ angle which defines the DCC
disorientation, of the other $O(4)$ angles distributions, of the local ratios
$R_{a}=\pi_{a}^{2}/{\vec{\pi}}^2$ $(a=1,2,3)$, and of the energies associated
with the fields at representative times.
