[subhankarnits]

Hi experts
I'm simulating a flow through a open channel.
Inlet BC- velocity inlet
Top surface - symmetry
Outlet- pressure outlet
Bottom- wall
I'm using VOF multiphase model( air and water)
Gravity on, surface tension 0.072, laminar model.
I'm plotting volumetric flow rate at outlet with iteration it's showing -0.24m3/s at iteration 1.
It means something is flowing through outlet but contour of volume fraction showing water is far away from outlet. It means air is out flowing. How can I stop this?
I just want volumetric flow rate when water reaches outlet.