filling and draining of tank
 

Hi dear friends
I want to simulate filling and draining of tank. I get bad results. results in compare with exact solution(bernoli equation) are wrong. I have doubt in boundary conditions.
pressure inlet: gauge pressure is equal to 0
pressure outlet: gauge pressure is equal to 0
operating pressure is equal to 101325pa
I attache a screenshot of my geometry an BCs.
Please help me in this case.


Best Regards
Jamal

please say more detail
are u using VOF model?

Thank you so much
I want to simulate only single phase and fluid flow.

your problem is in equilibrium because there isn't any pressure difference in domain.
both inlet and outlet pressure is 0
only gravity could be the cause of draining the tank. if your fluid is air, this parameter is negligible.

Thanks in advance
Fluid is water.
I dont know how determine mass flow inlet or velocity inlet, if I know this, I set these BCs. Can you help me in this case?

This looks like something you could solve with ODEs, rather than with FLUENT. Exactly what are you trying to calculate?