Fluids

Fluids

Divergence detected in multiphase and multicomponent flow

    • snr1
      Subscriber

      Dear sir, i am simulating the absorption process in Fluent 18.1. The geometry is as follows.



      I am using steady state solver with Eulerain Implicit model and species transport model (spcies mass transfer model). As the run calculation is started, immediately it is diverging and giving floating point exception. How to get resolve this issue. The error is shown below.


    • Rob
      Ansys Employee

      Try with transient: what flow regime are you expecting?

    • DrAmine
      Ansys Employee
      To add: if possible use actual versions.
    • snr1
      Subscriber

      Bubbly flow sir

    • snr1
      Subscriber

      What actual versions mean? I didn't get sir. Can you elaborate it further?

    • DrAmine
      Ansys Employee
      FLUENT version.
      Can you add details about phase interaction?
    • snr1
      Subscriber

      phase interaction:


      1. virtual mass: Default


      2. Drag: schiller-Naumann


      3. Lift, wall lubrication, Turbulent dispersion, and Heat: None


      4. Mass: Species mass transfer model


      5. Reactions: none


      6. Surface tension: constant


      7. Interfacial area: ia-symmetric

    • DrAmine
      Ansys Employee
      Disable all forces keep drag. Screenshot of mass transfer panel.
    • snr1
      Subscriber

    • DrAmine
      Ansys Employee
      Make mass transfer from liquid solution to gas and adjust resistances accordingly.
    • snr1
      Subscriber

      Yes sir i have tried that also, but has resulted the same.

    • DrAmine
      Ansys Employee

      What about assuming a resistance on the bubble sides instead of zero-resistance, does it help?


      Can you try with newer version?

    • DrAmine
      Ansys Employee

      Does it run without mass transfer?

    • snr1
      Subscriber

      With out mass transfer it works fine

    • DrAmine
      Ansys Employee

      That confirms that I was thinking.


      1/Try transient with small time step size


      2/Please try to run with actual release and let us know.

    • snr1
      Subscriber

      Dear sir, what excatly means actual release?


      Time steps i have tried are: 1e-4 anf 1e-6. But still results same

    • DrAmine
      Ansys Employee

      I am referring to using Fluent 2019R2. 

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