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Fluids

“Divergence detected for field Carbondioxide: iterations cancelled by Expert System”

    • uxsarah
      Subscriber

      I am doing a mold filling of a chemical reaction flow, but the error "Divergence detected for field Carbondioxide: iterations cancelled by Expert System " occured.


      How can solve the divergence problem? I tried to generate a fine mesh of the model, but it was not working.


      Many thanks.

    • uxsarah
      Subscriber

      The fllowing is a part of the listFile. Can someone please give me some advices, many thanks.


       


       ***************
       *             *
       *     VOF     *
       *             *
       ***************
       
       Running vof for T within [ 0.000E+00 , 2.000E+02 ]
        with dT-ini = 1.000E-01,
             dT-min = 1.000E-02, dT-max = 2.500E-01,
        with up to 2000 successful steps,
       
       
       
        ===> Starting VOF
               at T-ini = 0.000E+00
        =================================
       
       
       
       
      **************************************************************************
            Initial volume     =  1.4103619E-04 / 4.1392274E-02
      **************************************************************************

       Preprocessors  

       Convergence assumed : Rel. var. LT  1.00000E-04

       F.E.M. Task    

       Global divergence has occured. Diverg =  0.2000000E+04
       
       
      **************************************************************************
          VOF Step #1                                 |   Progress bar(s)  |
            Time               =  0.0000000E+00       |>                   |
            Volume of fluid    =  1.4103619E-04       |>                   |
            Volume filled (%)  =  3.4073070E-01       |>                   |
            Step status : KO
                Solver divergence occured.
               New time step      =  5.0000000E-02
      **************************************************************************

       Preprocessors  

       Convergence assumed : Rel. var. LT  1.00000E-04

       F.E.M. Task    


      Divergence detected for field Carbondioxide: iterations cancelled by Expert System

      Divergence detected for field Urethane: iterations cancelled by Expert System
       Global divergence has occured. Diverg =  0.2000000E+04
       
       
      **************************************************************************
          VOF Step #1                                 |   Progress bar(s)  |
            Time               =  0.0000000E+00       |>                   |
            Volume of fluid    =  1.4103619E-04       |>                   |
            Volume filled (%)  =  3.4073070E-01       |>                   |
            Step status : KO
                Solver divergence occured.
               New time step      =  2.5000000E-02

    • uxsarah
      Subscriber



      Modify the convergence test =2.00000E-3


      Modify the divergence test = 2.00000E+4


      Modify the convergence test for species = 5.000000E-3


      Modify the solver aggressivity =2 (very robust)


      ===> solver type=AMF direct solver


       


      Is there anything wrong with the setting?

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