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Open atmosphere B.C. in Fluent

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Old   December 20, 2011, 09:42
Question Open atmosphere B.C. in Fluent
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Soroush
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Hi everybody,
I'm trying to simulate a 3D model of oil drop rising in water (Using VOF multiphase scheme).
My geometry is a simple tank with upper surface open to atmosphere. What is the best boundary condition for the top surface.
I have tried Pressure outlet and I get backflow in some of the faces, is it normal, can it ruin the results?
Thanks...
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Old   December 21, 2011, 14:54
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duri
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If you are not studying the effect on surface, outflow or pressure outlet will work. Otherwise, extend the domain to include some air column and give pressure outlet at the exit.
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