please help me with this special kind of boundary condition.

mactonald · April 27, 2009, 09:08

I do a simulation on some kind of gas-liquid separator. there are two outlet and one of them is submerged in the liquid. that means only liquid can flow out and gas can not. how should I deal with this boundary condition, which kind of boundary should be selected? thanks!

vishyaroon · April 27, 2009, 15:15

Are you using a VOF model to solve this? If so at the outlet which is submerged in a liquid, you can specify the volume fraction of the liquid to be 1.0.

mactonald · April 30, 2009, 03:44

I have already used Euler multiphase model, VOF can not be turn on. so I try to find other measure to realize such condition. I have ever had a idea that adding porous media at one of outlet, but in star-cd porous media and euler model cannot co-exist either. now I wonder whether subroutine can realize this condition. Do you have experience of dealing with a similiar condition ? thank you!

vishyaroon · May 1, 2009, 12:39

I have used STAR CCM+ for a similar application. It was an analysis where I was looking at a pool of water that was being drained off due to the air blowing above it. However in the same simulation I had a porous media upstream of this pool of liquid. Sorry, I've not had a chance to try it with STAR CD.

mactonald · May 2, 2009, 08:07

thank you very much. Maybe I can try it with STAR-CCM+.

April 27, 2009, 09:08	please help me with this special kind of boundary condition.	#1
mactonald New Member mac Join Date: Apr 2009 Posts: 8 Rep Power: 17	I do a simulation on some kind of gas-liquid separator. there are two outlet and one of them is submerged in the liquid. that means only liquid can flow out and gas can not. how should I deal with this boundary condition, which kind of boundary should be selected? thanks!

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April 27, 2009, 15:15		#2
vishyaroon Senior Member Aroon Join Date: Apr 2009 Location: Racine WI Posts: 148 Rep Power: 17	Are you using a VOF model to solve this? If so at the outlet which is submerged in a liquid, you can specify the volume fraction of the liquid to be 1.0.

April 30, 2009, 03:44		#3
mactonald New Member mac Join Date: Apr 2009 Posts: 8 Rep Power: 17	I have already used Euler multiphase model, VOF can not be turn on. so I try to find other measure to realize such condition. I have ever had a idea that adding porous media at one of outlet, but in star-cd porous media and euler model cannot co-exist either. now I wonder whether subroutine can realize this condition. Do you have experience of dealing with a similiar condition ? thank you!

May 1, 2009, 12:39		#4
vishyaroon Senior Member Aroon Join Date: Apr 2009 Location: Racine WI Posts: 148 Rep Power: 17	I have used STAR CCM+ for a similar application. It was an analysis where I was looking at a pool of water that was being drained off due to the air blowing above it. However in the same simulation I had a porous media upstream of this pool of liquid. Sorry, I've not had a chance to try it with STAR CD.

May 2, 2009, 08:07		#5
mactonald New Member mac Join Date: Apr 2009 Posts: 8 Rep Power: 17	thank you very much. Maybe I can try it with STAR-CCM+.