initialize open channel flow with a know water surface profile
 

Hello.

I am simulating a simple open channel flow and I succeeded in it.
However there is a thing that I cannot do.

I would like to initialize the solution with a know water surface. The profile has to be linear, and connect the water surface at the inlet with that at the outlet, whose values are imposed in the boundary conditions. I tried in different ways, but the only thing that I can do is to create an horizontal water surface, starting or from the inlet or from the outlet. But I want a non-horizontal water surface, connecting the two known water depths.

Thank you for your help
Regards

Try the "Region" option.
use the min and max values
mark the region
use the Patch option

Thank you.
But in this way I can create an horizontal profile, since the region that I make can be only a parallelepiped. I do not want nor a horizontal water surface, neither a water surface parallel to the bed slope.

Thank you

In this way you may have a water surface with a defined slope (min Z and max Z values), yet in the case you need to have a parabolic surface, use your per-processor and define two zones. One showing the air zone, the other one maybe the water zone.
Patch them both in fluent for the secondary fluid, with 0 and 1 respectively.

good luck

Thank you.
I well understand your second option.
Concerning the first, where you say to me to impose Zmin and Zmax. Zmin should be the minimum Z of the domain patched with water, thus the minimum Z belongs the the bed of the channel, not to the water surface. Do I well understand?

Thank you for your useful help!