# filling and draining of tank

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September 14, 2013, 05:28
filling and draining of tank
#1
Senior Member

Jamal Foroozesh
Join Date: Oct 2012
Location: Iran
Posts: 124
Rep Power: 4
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.

Best Regards
Jamal
Attached Images
 tank.jpg (13.3 KB, 15 views)

September 14, 2013, 11:10
#2
Member

like.no.other
Join Date: Sep 2011
Posts: 30
Rep Power: 5
Quote:
 Originally Posted by jamalf64 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
are u using VOF model?
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 September 14, 2013, 11:51 #3 Senior Member   Jamal Foroozesh Join Date: Oct 2012 Location: Iran Posts: 124 Rep Power: 4 Thank you so much I want to simulate only single phase and fluid flow.

 September 14, 2013, 12:23 #4 Member   like.no.other Join Date: Sep 2011 Posts: 30 Rep Power: 5 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.

September 14, 2013, 14:55
#5
Senior Member

Jamal Foroozesh
Join Date: Oct 2012
Location: Iran
Posts: 124
Rep Power: 4
Quote:
 Originally Posted by like.no.other 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.
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?

 September 15, 2013, 15:50 #6 Member   Join Date: Dec 2012 Posts: 46 Rep Power: 4 This looks like something you could solve with ODEs, rather than with FLUENT. Exactly what are you trying to calculate? __________________ Find me online here.

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