Define custom volumetric reaction rate in a porous medium

- September 27, 2017 at 11:19 am
  
  nselvara
  Ansys Employee
  
  How to define custom volumetric reaction rate in a porous medium?
- October 17, 2017 at 7:50 am
  
  Arun Kumar
  Subscriber
  
  It is possible to define a custom volumetric reaction rate through a DEFINEVRRATE UDF (User-Defined Function) macro. In the case of a porous zone, the actual reaction will take place in only the fluid region of the porous medium, therefore, the true reaction rate is the value defined in DEFINEVRRATE multiplied by the porosity.
- September 24, 2019 at 2:06 pm
  
  VidushiUCT
  Subscriber
  
  You can see a tutorial on UDF for reactions in porous media from the UDF manual.
- October 28, 2019 at 1:31 pm
  
  Goenitz
  Subscriber
  
  But how can we be sure that reaction is only taking place on porous site, just and not everywhere in domain ( my reaction isn't like combustion, which can occur anywhere but reforming, which only occur in presence of catalyst?
- October 28, 2019 at 4:36 pm
  
  DrAmine
  Ansys Employee
  
  By using Boolean If you are in the correct cell zone thread.