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

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  • Last Post 28 November 2018
uxsarah posted this 28 November 2018

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.

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uxsarah posted this 28 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

uxsarah posted this 28 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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