initializing both vof and species using UDF

- May 17, 2023 at 2:46 pm
  
  jscsgh
  Subscriber
  
  Hiya,
  I am trying to use the vof model together with the species transportation model. I am having some problems when initializing the vof and species using UDF at the beginning of the calculation.
  The setup of the model is illustrated in the following figure. Two phases are included in the model between which a clear interface exists, and the two phases are differentiated and tracked using VOF. Two species are defined i n phase 2, and a certain area is initialized with species 2 (the circle).
  "DEFINE_INIT" can be used to initialize the vof value. The question is if "DEFINE_INIT" can also be used to initialize the distribution of a certain species. Can the initialization of VOF and species be included in the same "DEFINE_INIT" marco and what should be the sequence.
  Many thanks for your time and looking forward to your reply.
  Best regards
  Heng
- May 17, 2023 at 3:03 pm
  
  Rob
  Ansys Employee
  
  You'll need to initialise phase first, then species. Not sure about whether you'll need multiple DEFINE_INIT steps, I'd just use patch from the GUI.
  - May 17, 2023 at 3:22 pm
    
    jscsgh
    Subscriber
    
    Dear Rob,
    Many thanks for your reply. Since the area to be patched for both vof and species are quite complicated (the figure shown above is a simplified illustration), udf has to be used (rather than GUI). I will have a try first. Agian, many thanks for your reply.
    Best regards
    Heng

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