water in tank with vortex baffles

Shamoon Jamshed · February 7, 2022, 13:34

Hello, I am modeling a tank filled with water but pressurized with air at 5 bar. The outlet of the tank is equipped with a vortex breaker that is used to block unwanted air pockets to pass through. Therefore, the water should pass only.
Now , I am modeling the problem with VoF (explicit) . Phase 1 is water, phase 2 is air. Operating pressure is 5 bar. At outlet mass flow inlet for phase-2 is applied, like as if the water is going to some other source. MFR is 26kg/s. I first patch initial volume of phase 2 (air) to be like 70%. But the fluid water is not changing its position at all. That is, it remains 30%.

Please help in this problem

Regards,

SJ

Shamoon Jamshed · February 8, 2022, 10:32

please reply,

AlexanderZ · February 9, 2022, 04:40

don't remember exactly but there should be option to define phase in outflow BC

Shamoon Jamshed · February 9, 2022, 09:10

yes, it is. Infact, I did this case previously with some coarser mesh and a wider geometry but this might be the effect of the fine mesh. Do i try Implicit?

February 7, 2022, 13:34	water in tank with vortex baffles	#1
Shamoon Jamshed Senior Member Shamoon Jamshed Join Date: Apr 2009 Location: Karachi Posts: 381 Rep Power: 18	Hello, I am modeling a tank filled with water but pressurized with air at 5 bar. The outlet of the tank is equipped with a vortex breaker that is used to block unwanted air pockets to pass through. Therefore, the water should pass only. Now , I am modeling the problem with VoF (explicit) . Phase 1 is water, phase 2 is air. Operating pressure is 5 bar. At outlet mass flow inlet for phase-2 is applied, like as if the water is going to some other source. MFR is 26kg/s. I first patch initial volume of phase 2 (air) to be like 70%. But the fluid water is not changing its position at all. That is, it remains 30%. Please help in this problem Regards, SJ

February 9, 2022, 04:40		#3
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	don't remember exactly but there should be option to define phase in outflow BC __________________ best regards ****************************** press LIKE if this message was helpful

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February 8, 2022, 10:32		#2
Shamoon Jamshed Senior Member Shamoon Jamshed Join Date: Apr 2009 Location: Karachi Posts: 381 Rep Power: 18	please reply,

February 9, 2022, 09:10		#4
Shamoon Jamshed Senior Member Shamoon Jamshed Join Date: Apr 2009 Location: Karachi Posts: 381 Rep Power: 18	yes, it is. Infact, I did this case previously with some coarser mesh and a wider geometry but this might be the effect of the fine mesh. Do i try Implicit?