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What is the relationship between Solidification/Melting model and VOF model?

- July 28, 2021 at 9:07 am
  
  CFD_newbie
  Subscriber
  
  For melting of a solid to liquid, when I use Solidification/Melting model in ANSYS FLUENT, what is the impact of the results when using or not using the VOF model?
  Thx.
- July 28, 2021 at 10:05 am
  
  Rob
  Forum Moderator
  
  The former stops the material from moving when it gets cold (eg water and ice). The latter tracks a free surface between fluid phases (eg air and water).
- July 28, 2021 at 10:46 am
  
  CFD_newbie
  Subscriber
  
  Thank you for your reply.
  I am trying to simulate the PCM melting process. There are only solid and liquid PCM in a tank. The PCM material in the tank is heated from the solid phase to the liquid phase. Does the solidification/melting model need to be combined with the VOF model? Or is it enough to just use the solidification/melting model? When combining VOF or not, what is the difference between the results?
- July 28, 2021 at 10:49 am
  
  Rob
  Forum Moderator
  
  If you just have PCM and no head space (ie air space) then you don't need the VOF model. The difference is in what you're modelling, with a head space you may get a different heat transfer rate at that location.

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