iMUSIG setup in CFX

- December 4, 2020 at 9:41 am
  
  grayg34
  Subscriber
  
  I am trying to set up an iMUSIG polydispersed model in CFX. I want to have 2 velocity groups with 12 size groups in each. I define water as the continuous phase and air1 &air2 as polydispersed phases. For air1 I set the diameter range 0-6mm, air2 has 6-12mm size groups.
  Does CFX automatically couple the two velocity groups, as in coalescence of velocity group 1 into velocity group 2. If not, how do I set it up?
  When I run my current setup as described it solves fine but I am getting 90% size fraction in the largest bubble size of velocity group 1 and essentially no mass moving into velocity group 2.
- December 7, 2020 at 6:27 pm
  
  Surya Deb
  Ansys Employee
  
  Hello,
  Did you setup the Breakup and Coalescence models in the Polydispersed Fluids tab?
  You can get more information from the link below.
  Regards Surya
- December 7, 2020 at 7:08 pm
  
  DrAmine
  Ansys Employee
  
  If defined as polydisperse phase with imusig then intra-mass transfer mechanisms are taken into account if as Surya mentioned you are enabling them.
- December 8, 2020 at 12:10 pm
  
  grayg34
  Subscriber
  
  I had Breakup and coalescence activated.
  I think I found my problem. I was using 19.2 version and there was only MUSIG in the drop down menu. I switched to 20.1 and now there is an option for iMUSIG.
  
  Thank you for the help.
- December 8, 2020 at 12:15 pm
  
  DrAmine
  Ansys Employee
  
  iMUSIG was a beta feature