"Divergence detected for field Carbondioxide: iterations cancelled by Expert System"

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.

Comments

  • uxsarahuxsarah Member
    edited November 2018

    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

  • uxsarahuxsarah Member
    edited November 2018

    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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