Mixing fluids from separate zones not intermixing

    • Patrickodon

      Hi lads/ladies,


      I'm mixing two fluids in a process very similar to the Eulerian Multiphase Granular tutorial (not sure where it is online to link, sorry), but I can't get my different surfaces to interact with each other. I have a thin layer of calcium on top, which I'm trying to mix with a cylinder of Hydrogel via a stirrer bar at the bottom.

      I've tried multiple times on Inventor and DesignModeler. My latest iteration has been to create three surface patches on Inventor, import as a STEP file into Ansys, create three surfaces in DesignModeler, then create Named Selections in Mesh:



      In Fluent, I then change the Type-Wall of the Named Selections to Type-Interface:



      (I've tried creating a Wall all around my part, and Interfaces where I want the fluids mixing)

      but then come across a variety of issues:



      (Second image is error when I try to Run Calculation)

      What do I need to do to "Assign" the interfaces?


      When I was initially running the solution, before adding Interfaces, the model would run fine, but not mix (presumably as I had Walls instead of Interfaces). I'm at my wit's end with this, any help is hugely appreciated.

    • Vivek Praveen
      Ansys Employee
      Hi Patrickodon,
      Take a look at this tutorial:
      This can explain how to create interfaces in a moving mesh framework. 
      Also, have a look at this approach:
    • Murari Iyengar
      Ansys Employee

      Hi Patrickodon, 

      You will get this message when there is a border where no interface has been set. Please check your mesh thoroughly once more. 

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