[Amir M]

Hi,
I'm having trouble modeling a 2-phase VOF flow in a Fishway (image included).

It has 4 pools that are connected to each other and the whole body has a 5% slope across the X direction and no ceiling.


I need to model the flow normally going through all the pools. Can anyone please help me achieve that?

the problem is when i start the calculation, Pools 2-3-4 (from left) are running out of water (due to the slope) and flow entering the Pool 1 is going out from the top (when encounters the first cross sectional wall).


so after a few seconds of calculation, here is the velocity contours:




More information:

the top boundary condition is "pressure outlet" and the inlet is "velocity inlet".
Using K-epsilon RNG.