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Outlet BC with Vof?

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Old   May 26, 2012, 05:24
Question Outlet BC with Vof?
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Question from a beginner:

I am running an analysis of a buoy with Vof and eulerian multiphase air/sea water. But what is the difference between the "Volum fraction air/sea water" and "Volume fraction Heavy/light fluid" boundary conditions? Manuals from CD-adapco suggest that "Heavy/light" fluid be used for velocity inlet and "air/sea water" for pressure outlet. When I use these settings it does not converge, but using "heavy/light" BC on outlet gives good convergence...

Running with 2DOF, z-translation and y-rotation (the latter rather large; <25 deg pitch-up).

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Old   May 28, 2012, 15:29
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Heavy/light is the undisturbed volume fraction. Air/water is the resulting/disturbed volume fraction. So heavy/light should be used for BC.
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Old   May 28, 2012, 15:48
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Thanks alot! Been wondering about that one and was unable to find an answer...
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