# Volume fraction in CFX

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 April 14, 2011, 18:03 Volume fraction in CFX #1 New Member   Wendy Join Date: Mar 2011 Posts: 4 Rep Power: 7 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.

 April 15, 2011, 07:02 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,709 Rep Power: 98 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.

 September 2, 2011, 04:54 #3 New Member   Vishal Join Date: Feb 2011 Location: Bhopal, M.P. (India) Posts: 18 Rep Power: 7 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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