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filling and draining of tank

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Old   September 14, 2013, 05:28
Default filling and draining of tank
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Jamal Foroozesh
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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
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File Type: jpg tank.jpg (13.3 KB, 15 views)
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Old   September 14, 2013, 11:10
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Quote:
Originally Posted by jamalf64 View Post
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?
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Old   September 14, 2013, 11:51
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Jamal Foroozesh
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Thank you so much
I want to simulate only single phase and fluid flow.
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Old   September 14, 2013, 12:23
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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.
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Old   September 14, 2013, 14:55
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Jamal Foroozesh
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Quote:
Originally Posted by like.no.other View Post
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?
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Old   September 15, 2013, 15:50
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This looks like something you could solve with ODEs, rather than with FLUENT. Exactly what are you trying to calculate?
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