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Zero Volume Fraction in Free Surface Problem

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Old   September 10, 2009, 03:11
Default Zero Volume Fraction in Free Surface Problem
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Hi all,
i got a question about the calculated Volume Fraction in CFX 12.0.
I am trying to simulate a free surface problem pretty similar to the flow over a bump tutorial, where there is a distinct free surface between Air and a liquid.
It works pretty well, but there is still liquid volume fraction in the air of about 10^-15. My question is, since i am pretty new in CFD, is it generally possible to get a liquid volume fraction of zero in the air region (or similar: air volume fraction in the liquid region) or is it not possible?

I wasnt able to finde an answer for that in the documentation nor in this forum.

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Old   September 10, 2009, 06:31
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1e-15 is the minimum value for volume fraction. It is not allowed to go below this as otherwise you can get boundedness problems - that is volume fractions smaller than zero or greater than one.
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