For temperatures 
the fluid was seen to separate into two immiscible fluids as described
in [9, 38]. This is illustrated in figure 4-2
which shows the value of the order parameter 
for 
and T = 0.4 on a 128 by 128 site grid.
The shading is proportional to with
black represents
and light grey represents 
.
Initially the fluid is completely mixed with 
everywhere
and set randomly to a value in the range ( 
). After 1,000 time-steps the fluid has begun to separate into
small regions of each fluid although the value of 
is
smaller than its final value in each fluid. After 2,000 time-steps
the fluid has separated into many small areas of one fluid within the other. At this stage has almost reached its final value
although there is some variation within each fluid. By 4,000 time steps
is constant in each fluid.
For times greater
than 2,000 time-steps the small areas of fluid move around slowly and collide with each other to produce larger areas.
The size of the interface is about ten lattice
steps but can be altered by changing the interfacial energy 
[9].
