Species gradient for interphase mass transfer in two phase flow

- March 12, 2022 at 5:35 pm
  
  friday.abolorunke
  Subscriber
  
  Hello All,
- March 14, 2022 at 2:01 pm
  
  Rob
  Ansys Employee
  
  We're very limited on what UDF support we can give. For the macros, check the documentation, but I'd be very surprised if the saturation values featured in the species/phase gradient calculation.
  You can find the distance from a "something" to the nearest cell centre, or more likely the position of a "something" and then find the nearest cell centre.
  Mass transfer is available in VOF, check you've got species turned on before turning on mass transfer. How well it'll work given the free surface maths is another question: Eulerian is generally better but work is ongoing on the multiphase tools so keep reading the update notes in the manual.
- March 18, 2022 at 3:37 pm
  
  friday.abolorunke
  Subscriber
  
  Thank you for your response. I have follow up questions but I will create a different discussion for that.
- March 18, 2022 at 8:21 pm
  
  DrAmine
  Ansys Employee
  
  Look at wall boundary layer model : actually you require similar model I won't rely on approaches requiring distance to free surface. Phase Change will just occur at interfacual cells where interfacial area is non zero
- March 25, 2022 at 2:56 am
  
  shitizsehgal
  Subscriber
  
  I am working on a similar problem. Please get in touch via email: shitizsehgal@tamu.edu
  I can try to help.
- March 25, 2022 at 3:01 am
  
  friday.abolorunke
  Subscriber
  
  Sure, I am doing that right away! Thank you,
- March 25, 2022 at 9:37 am
  
  DrAmine
  Ansys Employee
  
  Great to see you guys connecting to one another :)

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