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Old   April 14, 2011, 18:03
Default Volume fraction in CFX
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Hi Everyone,

I'm looking at free surface flow tutorial in CFX and it sets the Water Volume Fraction to 0.5 for Isosurface in CFD-Post to show the free surface. Just wondering why it is 0.5 not 1. I tried from 0.1 to 0.9 and they give quite different values, what do they stead for?

I'm new to CFX and thank for any advices.

Last edited by Wendy1984; April 14, 2011 at 23:15.
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Old   April 15, 2011, 07:02
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A water.volume fraction of 0 represents pure air and 1 represents pure water. So a value of 0.5 is just the half way point and is defined as the interface.
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Old   September 2, 2011, 04:54
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Volume of Fluid means "The volume of the fluid which you are specifying upon the volume of all the fluids which you have taken."
Ex- if you take water and air and specify vol of water as 0.2,
it means
the volume of water/ (vol of water + vol of air) = 0.2
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