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please help me with this special kind of boundary condition.

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Old   April 27, 2009, 09:08
Red face please help me with this special kind of boundary condition.
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mac
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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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Old   April 27, 2009, 15:15
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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.
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Old   April 30, 2009, 03:44
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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!
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Old   May 1, 2009, 12:39
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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.
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Old   May 2, 2009, 08:07
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thank you very much. Maybe I can try it with STAR-CCM+.
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