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Mass flux at interface

- January 13, 2026 at 6:43 am
  
  pratheeba.nagarajan
  Subscriber
  
  Hi, I have a porous membrane layer in an annulus, there is transport of species across this layer. One side of this membrane layer will lose mass and the other side will gain mass. In addition, there will also movement along the length of the annulus. Can I use DEFINE_PROFILE macro? Fluent shows that it is available only at boundary. Can this be used at interface too? Thank you. Will this macro be hooked to the interface? I will need species , energy equations to be ON. I am doing a steady state simulation. I was thinking to use DEFINE_SOURCE, but since there is no reaction, I am not sure if I will end up creating mass at some locations. Thank you.
- January 13, 2026 at 8:06 am
  
  Essence
  Ansys Employee
  
  Hello,
  Any specific reasons for using the macros? You can also use the expressions to achieve mass flux and then report definitions to report it.
- January 20, 2026 at 1:03 pm
  
  SRP
  Ansys Employee
- January 20, 2026 at 1:24 pm
  
  pratheeba.nagarajan
  Subscriber
  
  Hi,
  Thnak you. The flux originates at the interphase between the membrane and the fluid layer (left side of membrane) and transports across the finite thickness of the membrane. I am not sure I understood your answer well.
  
  Thank you
  Pratheeba

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