Solving flow through a Backward Facing Step using Icofoam solver

Velocity magnitude contour and line plot for grading factor of 0.2:

Velocity magnitude line plot for grading factor of 0.5:

Velocity magnitude line plot for grading factor of 0.8:

On comparing Velocity magnitude line plot for different grading factors, i.e 0.2, 0.5, 0.8, we see that there is a small change in line plots. So the grading factors do affect the solution of simulation, but to a small extent.