Velocity inlet boundary condtions for multiphase flow

- June 28, 2019 at 8:14 am
  
  jazi1212
  Subscriber
  
  Hello,
  
  i have air and water droplets coming in in an annular pipe as primary and secondary phase. the inlet surface is same since it is a single annular pipe however for defining the velocity inlet boundary consition i need two separate named surface selection that i can define as liquid inlet and air inlet. How i can name two sections of inlet after meshing so fluent considers liquid inlert and air inlet separately?
- June 28, 2019 at 9:57 am
  
  Rob
  Ansys Employee
  
  Which multiphase model are you using?
- June 28, 2019 at 9:59 am
  
  jazi1212
  Subscriber
  
  Eulerian Multiphase Model along with Population Balance Model for Poly disperse droplet flow.
- June 28, 2019 at 1:23 pm
  
  DrAmine
  Ansys Employee
  
  Why do you want to have two named selection referring to the same surface? This is by the way not possible. Just use the unique surface and provide your BC input!
- June 28, 2019 at 1:26 pm
  
  jazi1212
  Subscriber
  
  Because my input is air and droplets and when i give droplet volume fraction=1, Fluent assumes air mass flow rate zero.
  
  I figured out now hat it is not possible so i am using now a pipe geometry with inner and outer ring so i can define air and droplets separately.
- June 28, 2019 at 1:53 pm
  
  DrAmine
  Ansys Employee
  
  That could be a solution. Please mark this then as "Is Solved".
  
  Good Luck

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