PEMFC tutorial case problem

Suleyman41 · June 11, 2023, 19:11

I tracked PEMFC tutorial steps. I got this error

Code:

Partition interfaces are not going through highly stretched area, no repartitioning needed.

  iter  continuity  x-velocity  y-velocity  z-velocity      energy          h2          o2         h2o       uds-0       uds-1       uds-2       uds-3     time/iter

Warning: Electrical boundary conditions are being set in the b.c. task page
Having flux boundary conditions for uds-0 on anode and cathode external contacts is not supported.
Please specify value boundary conditions for uds-0 on at least one external contact.
       V_cell  = -nan(ind) (V)      ... V_open    = 1.193653 (V)
       I_anode = 0.000000 (A/cm^2) ... I_cathode = 0.000000 (A/cm^2) ... MEA_area = 5.000000 (cm^2) ... dI_mea = -0.000000 (A/cm^2) ... dI_stk = -0.000000 (A/cm^2) 
        Stabilizing temperature to enhance linear solver robustness.
        Stabilizing temperature using GMRES to enhance linear solver robustness.

Divergence detected in AMG solver: temperature        Stabilizing uds-0 to enhance linear solver robustness.
        Stabilizing uds-0 using GMRES to enhance linear solver robustness.

Divergence detected in AMG solver: uds-0        Stabilizing uds-1 to enhance linear solver robustness.
        Stabilizing uds-1 using GMRES to enhance linear solver robustness.

Divergence detected in AMG solver: uds-1        Stabilizing uds-3 to enhance linear solver robustness.
        Stabilizing uds-3 using GMRES to enhance linear solver robustness.

Suleyman41 · June 12, 2023, 15:36

why i get this message.

Code:

Partition interfaces are not going through highly stretched area, no repartitioning needed.

  iter  continuity  x-velocity  y-velocity  z-velocity      energy          h2          o2         h2o       uds-0       uds-1       uds-2       uds-3     mean_o2      min_o2     mean_h2      min_h2  cell-volta  total-curr  total-curr     time/iter
       V_cell  = 0.350000 (V)      ... V_open    = 0.950000 (V)
       I_anode = 0.080925 (A/cm^2) ... I_cathode = 0.000000 (A/cm^2) ... MEA_area = 0.100000 (cm^2) ... dI_mea = 0.080925 (A/cm^2) ... dI_stk = 0.080925 (A/cm^2) 
     1  1.0000e+00  6.9096e-03  4.2420e-03  1.4673e-01  1.2098e-06  6.7876e-03  2.2074e-03  1.1658e-02  6.3028e-04  1.1874e-01  0.0000e+00  0.0000e+00                                                                                      3:42:08 3332
       V_cell  = 0.350000 (V)      ... V_open    = 0.950000 (V)
       I_anode = 8.156811 (A/cm^2) ... I_cathode = 0.000000 (A/cm^2) ... MEA_area = 0.100000 (cm^2) ... dI_mea = 8.156811 (A/cm^2) ... dI_stk = 8.156811 (A/cm^2) 
 temperature limited to 5.000000e+03 in 32160 cells on zone 31 in domain 1
  temperature limited to 5.000000e+03 in 4320 cells on zone 35 in domain 1
  temperature limited to 5.000000e+03 in 25920 cells on zone 36 in domain 1
  temperature limited to 5.000000e+03 in 3365 cells on zone 30 in domain 1
  temperature limited to 5.000000e+03 in 9100 cells on zone 42 in domain 1
  temperature limited to 5.000000e+03 in 4320 cells on zone 37 in domain 1
  temperature limited to 5.000000e+03 in 41221 cells on zone 41 in domain 1
  temperature limited to 5.000000e+03 in 35859 cells on zone 32 in domain 1
  temperature limited to 5.000000e+03 in 32000 cells on zone 40 in domain 1
  temperature limited to 5.000000e+03 in 8640 cells on zone 38 in domain 1
  temperature limited to 5.000000e+03 in 8640 cells on zone 34 in domain 1
  temperature limited to 5.000000e+03 in 77760 cells on zone 39 in domain 1
  temperature limited to 5.000000e+03 in 73440 cells on zone 33 in domain 1
  temperature limited to 5.000000e+03 on 12346 faces
     2  9.4381e-01  4.5490e-03  3.2178e-03  1.1151e-01  3.0771e-04  8.6225e-04  6.0910e-04  1.5987e-03  4.3931e-05  2.4499e-03  0.0000e+00  0.0000e+00                                                                                      3:53:10 3331
       V_cell  = 0.350000 (V)      ... V_open    = 0.950000 (V)
       I_anode = 0.000000 (A/cm^2) ... I_cathode = 0.000000 (A/cm^2) ... MEA_area = 0.100000 (cm^2) ... dI_mea = 0.000000 (A/cm^2) ... dI_stk = 0.000000 (A/cm^2) 
 temperature limited to 5.000000e+03 in 32160 cells on zone 31 in domain 1
  temperature limited to 5.000000e+03 in 4320 cells on zone 35 in domain 1
  temperature limited to 5.000000e+03 in 25920 cells on zone 36 in domain 1
  temperature limited to 5.000000e+03 in 6526 cells on zone 30 in domain 1
  temperature limited to 5.000000e+03 in 9100 cells on zone 42 in domain 1
  temperature limited to 5.000000e+03 in 4320 cells on zone 37 in domain 1
  temperature limited to 5.000000e+03 in 45868 cells on zone 41 in domain 1
  temperature limited to 5.000000e+03 in 38686 cells on zone 32 in domain 1
  temperature limited to 5.000000e+03 in 32000 cells on zone 40 in domain 1
  temperature limited to 5.000000e+03 in 8640 cells on zone 38 in domain 1
  temperature limited to 5.000000e+03 in 8640 cells on zone 34 in domain 1
  temperature limited to 5.000000e+03 in 77760 cells on zone 39 in domain 1
  temperature limited to 5.000000e+03 in 73440 cells on zone 33 in domain 1
  temperature limited to 5.000000e+03 on 32135 faces
     3  5.7657e-01  2.7735e-03  1.7957e-03  5.5965e-02  6.4765e-04  2.2276e-04  5.3998e-04  9.4411e+00  3.9826e-06  1.2058e-04  3.0748e+00  0.0000e+00                                                                                      4:01:59 3330
       V_cell  = 0.350000 (V)      ... V_open    = 0.950000 (V)
       I_anode = 0.000000 (A/cm^2) ... I_cathode = 0.000000 (A/cm^2) ... MEA_area = 0.100000 (cm^2) ... dI_mea = 0.000000 (A/cm^2) ... dI_stk = 0.000000 (A/cm^2) 
 temperature limited to 5.000000e+03 in 32160 cells on zone 31 in domain 1
  temperature limited to 5.000000e+03 in 4320 cells on zone 35 in domain 1
  temperature limited to 5.000000e+03 in 25920 cells on zone 36 in domain 1
  temperature limited to 1.000000e+00 in 50 cells on zone 30 in domain 1
  temperature limited to 5.000000e+03 in 2888 cells on zone 30 in domain 1
  temperature limited to 5.000000e+03 in 8736 cells on zone 42 in domain 1
  temperature limited to 5.000000e+03 in 4320 cells on zone 37 in domain 1
  temperature limited to 5.000000e+03 in 16504 cells on zone 41 in domain 1
  temperature limited to 5.000000e+03 in 21210 cells on zone 32 in domain 1
  temperature limited to 5.000000e+03 in 32000 cells on zone 40 in domain 1
  temperature limited to 5.000000e+03 in 8640 cells on zone 38 in domain 1
  temperature limited to 5.000000e+03 in 8640 cells on zone 34 in domain 1
  temperature limited to 5.000000e+03 in 77705 cells on zone 39 in domain 1
  temperature limited to 5.000000e+03 in 73414 cells on zone 33 in domain 1
  temperature limited to 1.000000e+00 on 13 faces
 temperature limited to 5.000000e+03 on 28302 faces
     4  1.0000e+00  1.4326e-03  1.7083e-03  6.1205e-02  6.0824e-03  1.2474e-02  1.1452e-02  1.7912e+02  3.5001e-07  1.1797e-05  7.4926e-01  0.0000e+00                                                                                      4:20:06 3329
       V_cell  = 0.350000 (V)      ... V_open    = 0.950000 (V)
       I_anode = 0.000000 (A/cm^2) ... I_cathode = 0.000000 (A/cm^2) ... MEA_area = 0.100000 (cm^2) ... dI_mea = 0.000000 (A/cm^2) ... dI_stk = 0.000000 (A/cm^2) 

 Reversed flow on 750 faces (100.0% area) of pressure-outlet 82.

 Reversed flow on 700 faces (100.0% area) of pressure-outlet 85.
        Stabilizing species-1 to enhance linear solver robustness.
        Stabilizing species-2 to enhance linear solver robustness.
 temperature limited to 5.000000e+03 in 32160 cells on zone 31 in domain 1
  temperature limited to 5.000000e+03 in 4320 cells on zone 35 in domain 1
  temperature limited to 5.000000e+03 in 25920 cells on zone 36 in domain 1
  temperature limited to 5.000000e+03 in 4881 cells on zone 30 in domain 1
  temperature limited to 5.000000e+03 in 50699 cells on zone 41 in domain 1
  temperature limited to 5.000000e+03 in 48300 cells on zone 32 in domain 1
  temperature limited to 5.000000e+03 in 38 cells on zone 40 in domain 1
  temperature limited to 5.000000e+03 in 8640 cells on zone 34 in domain 1
  temperature limited to 5.000000e+03 in 14127 cells on zone 39 in domain 1
  temperature limited to 5.000000e+03 in 73440 cells on zone 33 in domain 1
  temperature limited to 1.000000e+00 on 13 faces
 temperature limited to 5.000000e+03 on 20416 faces
     5  1.0000e+00  6.3802e-04  1.0906e-03  1.1877e-02  4.7120e-03  6.2249e-03  1.1674e-02  3.4205e-01  1.3485e-07  2.2021e-06  4.2541e-01  0.0000e+00                                                                                      4:45:41 3328
       V_cell  = 0.350000 (V)      ... V_open    = 0.950000 (V)
       I_anode = 3521.507746 (A/cm^2) ... I_cathode = 0.000000 (A/cm^2) ... MEA_area = 0.100000 (cm^2) ... dI_mea = 3521.507746 (A/cm^2) ... dI_stk = 3521.507746 (A/cm^2) 

 Reversed flow on 206 faces (39.3% area) of pressure-outlet 82.
        Stabilizing pressure correction to enhance linear solver robustness.
        Stabilizing species-0 to enhance linear solver robustness.
        Stabilizing species-1 to enhance linear solver robustness.
        Stabilizing species-2 to enhance linear solver robustness.
        Stabilizing species-2 using GMRES to enhance linear solver robustness.

Divergence detected in AMG solver: species-2        Stabilizing temperature to enhance linear solver robustness.
        Stabilizing temperature using GMRES to enhance linear solver robustness.

Divergence detected in AMG solver: temperature temperature limited to 5.000000e+03 on 14185 faces
        Stabilizing uds-2 to enhance linear solver robustness.
        Stabilizing uds-2 using GMRES to enhance linear solver robustness.

Divergence detected in AMG solver: uds-2
Divergence detected in AMG solver: species-2
Divergence detected in AMG solver: temperature
Divergence detected in AMG solver: uds-2
Divergence detected in AMG solver: species-2
Divergence detected in AMG solver: temperature
Divergence detected in AMG solver: uds-2
Divergence detected in AMG solver: species-2
Divergence detected in AMG solver: temperature
Divergence detected in AMG solver: uds-2
Error at host: floating point exception

===============Message from the Cortex Process================================

Compute processes interrupted. Processing can be resumed.

==============================================================================

Error: floating point exception
Error Object: #f
Registering ReportDefFiles, ()
Registering Udflib, ()

Error at Node 0: floating point exception

Error at Node 3: floating point exception

Error at Node 1: floating point exception

Error at Node 2: floating point exception
Writing "| gzip -2cf > SolutionMonitor.gz"...
Writing temporary file C:\Users\Suleyman\AppData\Local\Temp\flntgz-138362 ...
Done.

Suleyman41 · July 15, 2023, 12:16

i still have same problem

Partition interfaces are not going through highly stretched area, no repartitioning needed.

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July 15, 2023, 12:16		#3
Suleyman41 New Member Join Date: Jun 2018 Posts: 7 Rep Power: 9	i still have same problem Partition interfaces are not going through highly stretched area, no repartitioning needed.