# How to understand the difference between VOF and MIXTURE

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 April 15, 2017, 22:51 How to understand the difference between VOF and MIXTURE #1 New Member   L Join Date: Apr 2017 Posts: 3 Rep Power: 8 ANSYS Help 17.4.2. mentioned that: "The mixture model, like the VOF model, uses a single-fluid approach. It differs from the VOF model in two respects: The mixture model allows the phases to be interpenetrating. The volume fractions αq and αp for a control volume can therefore be equal to any value between 0 and 1, depending on the space occupied by phase q and phase p." I have a few questions: 1.How to understand "can therefore be equal to any value between 0 and 1"? 2.The theory guide only mentionde" Volume Fraction Equation for the Secondary Phases". Does this mean that the volume fraction equation will not be solved for the primary phase, and, just like in VOF, the primary phase volume fraction will be computed based on the constraint that the sum of all αq equal to 1? mohammed mahmoud likes this.

 April 15, 2017, 23:48 #2 Member     Ahmed Alkaisi Join Date: Aug 2015 Location: Australia Posts: 80 Rep Power: 9 Hi I'm also confused between the mixture and vof models I want to simulate the evaporation-condensation Which model is more appropriate, please? Thanks Sent from my SM-G900I using CFD Online Forum mobile app

April 16, 2017, 04:27
#3
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L
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Quote:
 Originally Posted by Ahmed Alkaisi Hi I'm also confused between the mixture and vof models I want to simulate the evaporation-condensation Which model is more appropriate, please? Thanks Sent from my SM-G900I using CFD Online Forum mobile app
I know little of it, but as far as I know, there were some tutorials about evaporation-condensation and they basically used mixture model, so I think you might try the mixture model.
Furthermore, I think maybe you would like to learn about the evaproation-condensation model in "Phase Interaction -- Mass".

April 18, 2017, 12:07
#4
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Ahmed Alkaisi
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Quote:
 Originally Posted by cfdonlineforl I know little of it, but as far as I know, there were some tutorials about evaporation-condensation and they basically used mixture model, so I think you might try the mixture model. Furthermore, I think maybe you would like to learn about the evaproation-condensation model in "Phase Interaction -- Mass".
Can you send me the tutorial, please?
Thanks

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April 19, 2017, 00:50
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 Originally Posted by Ahmed Alkaisi Can you send me the tutorial, please? Thanks Sent from my SM-G900I using CFD Online Forum mobile app
That is a tutorial written in Chinese, so I afraid that it may not be easy for you to read.
http://blog.sina.com.cn/s/blog_599d8faa01011aql.html

April 20, 2017, 01:56
#6
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Ahmed Alkaisi
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Quote:
 Originally Posted by cfdonlineforl That is a tutorial written in Chinese, so I afraid that it may not be easy for you to read. http://blog.sina.com.cn/s/blog_599d8faa01011aql.html
Thank you so much

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 Tags mixture, volume fraction