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Vof oulet bc with gravity

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Old   June 9, 2009, 12:30
Default Vof oulet bc with gravity
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Kuochen Tsai
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I was running a problem using VOF with gravity turned on (interFoam and rasInterFoam). Using the damBreak case as an example, if the gravity is reversed, the liquid is supposed to flow out of the top boundary (atmosphere). Using the default boundary settings (pressureInletOuletVelocity for U and totalPressure for pd). I found that a good portion of the liquid was bounced back to the domain. However, if the gravity was turned off at some point in time (say, 0.2 s), the liquid will flow out of the domain naturally. In contrast, Fluent can handle this pretty well with pressure outlet bc. I tried several different combinations of BCs for U and pd, but without luck. Does anyone have a solution for this or knows what's going on with OpenFOAM's VOF BC implementation?
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Old   June 26, 2009, 04:19
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isabel
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I am working with the damBreak tutorial and I am using Fluent as a postprocessor. The problem is that I don't know how to see the volume fraction in Fluent.
Does anybody know how to do it?

Thanks in advance
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Old   June 30, 2009, 05:38
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Bernhard Gschaider
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Quote:
Originally Posted by isabel View Post
I am working with the damBreak tutorial and I am using Fluent as a postprocessor. The problem is that I don't know how to see the volume fraction in Fluent.
Does anybody know how to do it?
I just answered this in another thread. Nevertheless. You hit point 5 and 7 of http://openfoamwiki.net/index.php/Ho..._Message_Board

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