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Bubble formation from orifice with interfoam

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Old   May 7, 2021, 09:05
Default Bubble formation from orifice with interfoam
Bushra Rasheed
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I am trying to simulate an air bubble formed from a 1mm orifice. But I am getting very unrealistic results.

I have defined an inletOutlet boundary condition at outlet in velocity and fixedFluxPressure at outlet in p_rgh. The side walls are slip walls. Contact angle is set at 25 degrees. The 1mm orifice is not defined in setFields, rather it is set as fixedValue boundary condition of uniform 0 in alpha.water. Outlet is also set at fixedValue 0 in alpha.water. I have also tried using inletOutlet instead of fixedValue.
I have tried using constant flow rate boundary condition at orifice as well but still the results are very unrealistic. The air at outlet should not be moving neither should the bubble shape distort so much.
No bubbles are formed if I give 0 orifice velocity or very small flow rate in the boundary condition.
Attaching pictures of initial setfields domain and bubbles formed at 2 different time steps.
Please help!
Attached Images
File Type: jpg contact angle 25 orifice.JPG (30.5 KB, 23 views)
File Type: jpg initial field.JPG (31.3 KB, 16 views)
File Type: jpg time_step_2.JPG (33.5 KB, 12 views)
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contact angle, interfoam bubble, multiphase

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