Species transport of non-reacting fluids

- December 19, 2019 at 12:01 am
  
  sanshan1994
  Subscriber
  
  Hello,
  
  When using the species transport model, how do I pull out volume concentration values of each species during post processing? Fluent only seems to provide mass fraction, mole fraction, molar concentration.
  
  Thank You
- December 19, 2019 at 5:50 am
  
  DrAmine
  Ansys Employee
  
  Yes you need your input of volume concentration or partial density to mass fraction.
- December 19, 2019 at 7:58 pm
  
  sanshan1994
  Subscriber
  
  Hi, thank you for the reply, but I do not quite understand what you mean by input vol conc.? While giving the inputs we only mention mass fraction as well as the velocities.
  
  In my case I'm trying to validate a case where nitrogen is being mixed in air, and to compare my results to the reference I need volume concentration that I'm not able to get directly from fluent. Is there any way I can obtain this from fluent?
  
  Thank you!!
- December 20, 2019 at 9:37 am
  
  Rob
  Ansys Employee
  
  Use the custom field functions (User Defined tab). As they're gases isn't volume fraction the same as mole fraction? It's been a while since I last had to think about it.

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