# vof=0.5 in dfbi

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 April 8, 2009, 06:27 vof=0.5 in dfbi #1 Member   Radiatn Join Date: Mar 2009 Posts: 34 Rep Power: 9 In the tutorial, why do they choose 0.5 to visualize the isosurface of VOF? What does VOF=0.5 mean? Is it a surface where it is 50% air and 50% water? Shouldn't we use VOF=1.0 to show the actual surface of water? Can I get explanation from the DFBI experts in here?

 April 8, 2009, 14:33 #2 Member   Anton Lyaskin Join Date: Mar 2009 Location: Samara, Russia Posts: 66 Rep Power: 9 Actually any fractional VOF value (i.e. 0

 April 8, 2009, 20:36 #3 Member   Radiatn Join Date: Mar 2009 Posts: 34 Rep Power: 9 Thanks Anton! So, that means we should be showing the VOF=1.0 if we really want to show the actual surface of water? Why does tutorial choose 0.5? When I played with VOF values, almost nothing appears when the 0.9

 April 9, 2009, 04:07 #4 Member   Anton Lyaskin Join Date: Mar 2009 Location: Samara, Russia Posts: 66 Rep Power: 9 No, the situation is more tricky. There's no way to get CORRECT representation of REAL free surface with isosurface of VOF. The best way is just to select all the cells for which 0

 April 16, 2009, 05:57 #5 Senior Member   Ping Join Date: Mar 2009 Posts: 234 Rep Power: 10 Please go and read the theory on STAR-CCM+'s VOF model ! Modeling > Modeling Multi-Phase Flow > Using the VOF Multi-Phase Model > What Is the VOF Multi-Phase Model? VOF = 0 means zero of the second phase, and VOF = 1 mean 100% of that phase., so 0.5 is half way between, and where the free surface is located.

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