[hmasenger]

Hi dear friends

i am modeling water flow over an spillway by a free surface model.the problem is that i don't know how to calculate average water velocity just in water phase .i thing CFX calculates a wrong value while using "average water velocity@outlet"
i think cfx considers velocity in whole outlet surface but i need it to be calculated on only water phase.
one more question:
does any one knows how can i calculate water depth in free surface model? i mean i know how to use an iso surface at VOF=0.5 and then making Poly line by intersections an then plotting Y at that poly line , but can you suggest me an expression to subtract bottom elevation from water surface elevation?

best regards