CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   CFX (http://www.cfd-online.com/Forums/cfx/)
-   -   Zero Volume Fraction in Free Surface Problem (http://www.cfd-online.com/Forums/cfx/68199-zero-volume-fraction-free-surface-problem.html)

marega September 10, 2009 03:11

Zero Volume Fraction in Free Surface Problem
 
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.

regards

ghorrocks September 10, 2009 06:31

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.


All times are GMT -4. The time now is 18:56.