How to understand the difference between VOF and MIXTURE
 

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?

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

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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

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

Thank you so much

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