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please help me with this special kind of boundary condition.

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Old   April 27, 2009, 08:08
Red face please help me with this special kind of boundary condition.
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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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