Floworks -I decide what grid size/quality settings
 

Should I decide what grid size/quality settings I need based on looking at the final pressure on a surface that I am interested in, and run the simulation (Floworks) at quality 3, 4, 5, 6, 7, 8 (grid sizes) and then pick the fastest setting where the result is within a few percent of the quality-8 result?

Also if I do a time-dependent simulation for 0.001 seconds of physical time, I noticed that the number of 'travels' changes depending on the grid size. Why is that?