[quattro123]

Hello,

i was working with the tutorial from fluent, the lid driven cavity:
http://cfd.iut.ac.ir/files/cavity.pdf

In this tutorial, they initialize with chosen velocities of x=0.5 and y=0.02.


Can someone explain me why?
Why they did not simply initialized from the lid without any velocity settings?




My specific problem is that i want to compare the velocities on the mid axis of the lid with different pressure-velocity couplings (simple, simpleC, piso), but when i initialize from the lid directly, all three velocity profiles are equal each other.

When i follow the fluent tutorial and i initialize with initial velocity magnitudes, the three velocity plots are different.


Now i am unsure which solution is the better one to compare the pressure-velocity couplings? Or maybe all three velocity xy-plots HAVE to be the same?

regards