Grid 1 is the coarsest grid and grid 5 is the finest grid. It was
found that the average variation in the velocity component magnitude,
in the Y direction along the width of the leak was not more
than 0.003% between grid 4 and grid 5. The average variation in
the velocity component magnitude, in the Y direction along the
height of the leak was not more than 2.1% and in the Z direction
along the height of the leak was not more than 0.19% from grid 4
to grid 5. Grid 4 with 600,000 cells was therefore considered to be
sufficient for all the numerical calculations. Due to the volume of
the work undertaken, and as all the models had the same physical