Emptying of a tank using VOF modelling

cric92 · December 25, 2012, 23:20

I am trying to model a tank with an open top and a spherical base filled with water. There is a small outlet at the center of the base and the tank is emptying under the action of gravity. I am using an axisymmetric domain, standard K-epsilon turbulence model, VOF modelling and geo-reconstruct scheme. I am having difficulty in getting a solution when I apply a pressure difference between inlet and outlet. Also when I check the mass flow rates at different cross-sections in my tank and the outlet they are different, which I think should be the same. What should I do to handle this particular problem properly?

msaeedsadeghi · December 25, 2012, 23:42

I think you have not setted boundary and operating conditions.

cric92 · December 26, 2012, 08:12

Thanks.. You are right. With appropriate operating and boundary conditions the solution runs nicely

cric92 · December 26, 2012, 08:23

Now I am simulating with components of gravity in both x and y dimensions. For this I have to shift to 2D planer domain from axisymmetric. What might be the relation of mass flow rate I get in the 2D case in comparison to the axisymmetric case?

December 25, 2012, 23:20	Emptying of a tank using VOF modelling	#1
cric92 New Member Join Date: Dec 2012 Posts: 11 Rep Power: 13	I am trying to model a tank with an open top and a spherical base filled with water. There is a small outlet at the center of the base and the tank is emptying under the action of gravity. I am using an axisymmetric domain, standard K-epsilon turbulence model, VOF modelling and geo-reconstruct scheme. I am having difficulty in getting a solution when I apply a pressure difference between inlet and outlet. Also when I check the mass flow rates at different cross-sections in my tank and the outlet they are different, which I think should be the same. What should I do to handle this particular problem properly?

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December 25, 2012, 23:42		#2
msaeedsadeghi Senior Member SSL Join Date: Oct 2012 Posts: 226 Rep Power: 14	I think you have not setted boundary and operating conditions.

December 26, 2012, 08:12		#3
cric92 New Member Join Date: Dec 2012 Posts: 11 Rep Power: 13	Thanks.. You are right. With appropriate operating and boundary conditions the solution runs nicely

December 26, 2012, 08:23		#4
cric92 New Member Join Date: Dec 2012 Posts: 11 Rep Power: 13	Now I am simulating with components of gravity in both x and y dimensions. For this I have to shift to 2D planer domain from axisymmetric. What might be the relation of mass flow rate I get in the 2D case in comparison to the axisymmetric case?