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Sudden increase the residual of Maxwell's equations

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Old   October 13, 2016, 03:22
Post Sudden increase the residual of Maxwell's equations
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Zhen
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Hi guys,

I am simulating free burning arc in open air. My model can run the DC arc current of 5 kA and arcing time 10 ms. But for arc time 5 kA and 100 ms, it can run another 100 ms after the arcing time and then it crashes. After I check the out file, I find there is an sudden increase of the residual of Maxwell's equaions. It is understandable that after the arcing time, there is no more current input and any other energy input, therefore the Maxwell's equations will stops calculation gradually. To prevent the fault extrapolation, I add a step function to the current input to make sure that the current input stays 0 after the arcing time. I also changed the timestep from 1e-3 and 1e-4 but still crash at the same time. Does anyone have some solution for that? Thank you

Timestep: 1e-4

Adaptive Timestepping Information |
----------------------------------------------------------------------
| Direction | Ratio | Last Value | Next Value | RMS Co | Max Co |
+----------------+-------+------------+------------+--------+--------+
| Unchanged | 1.000 | 1.0000E-04 | 1.0000E-04 | 0.08 | 0.28 |
+----------------+-------+------------+------------+--------+--------+

================================================== ====================
TIME STEP = 4031 SIMULATION TIME = 2.0627E-01 CPU SECONDS = 1.015E+07
(THIS RUN: 1071 1.0139E-01 2.346E+06)
----------------------------------------------------------------------
COEFFICIENT LOOP ITERATION = 1 CPU SECONDS = 2.346E+06
----------------------------------------------------------------------
| Equation | Rate | RMS Res | Max Res | Linear Solution |
+----------------------+------+---------+---------+------------------+
| U-Mom | 0.89 | 6.9E-05 | 8.2E-04 | 4.7E-01 ok|
| V-Mom | 0.92 | 6.7E-05 | 1.1E-03 | 4.8E-01 ok|
| W-Mom | 0.85 | 1.9E-04 | 8.8E-04 | 4.7E-01 ok|
| P-Mass | 1.00 | 2.1E-03 | 1.6E-02 | 12.5 7.3E-02 OK|
+----------------------+------+---------+---------+------------------+
| Ax-Mag-Fluid Domain | 0.00 | 5.4-137 | 5.4E-70 | 0.0E+00 OK|
| Ay-Mag-Fluid Domain | 0.00 | 7.8-137 | 8.7E-70 | 0.0E+00 OK|
| Az-Mag-Fluid Domain | 0.00 | 1.4-136 | 8.5E-70 | 0.0E+00 OK|
| Ax-Mag-Solid Domain | 0.00 | 1.5-136 | 1.1E-69 | 0.0E+00 OK|
| Ay-Mag-Solid Domain | 0.00 | 2.1-136 | 1.2E-69 | 0.0E+00 OK|
| Az-Mag-Solid Domain | 0.00 | 2.7-136 | 1.2E-69 | 0.0E+00 OK|
| Ax-Mag-Solid Domain | 0.00 | 3.6E-72 | 4.1E-71 | 0.0E+00 OK|
| Ay-Mag-Solid Domain | 0.00 | 5.0E-72 | 6.8E-71 | 0.0E+00 OK|
| Az-Mag-Solid Domain | 0.00 | 2.3E-71 | 2.5E-70 | 5.2 0.0E+00 OK|
+----------------------+------+---------+---------+------------------+
| E-Pot-Fluid Domain | 0.00 | 2.3E-91 | 1.7E-89 | 0.0E+00 OK|
| E-Pot-Solid Domain E | 0.00 | 9.1-105 | 1.8-103 | 0.0E+00 OK|
| E-Pot-Solid Domain E | 0.00 | 2.1-106 | 4.5-105 | 5.4 0.0E+00 OK|
+----------------------+------+---------+---------+------------------+
| H-Energy | 1.00 | 4.7E-04 | 7.0E-03 | 2.4E-05 OK|
| T-Energy-Solid Domai | 1.00 | 1.2E-05 | 4.1E-04 | 2.4E-05 OK|
| T-Energy-Solid Domai | 1.00 | 5.5E-05 | 3.3E-04 | 5.5 2.4E-05 OK|
+----------------------+------+---------+---------+------------------+
| K-TurbKE | 1.00 | 2.5E-04 | 2.7E-03 | 5.5 4.1E-05 OK|
| E-Diss.K | 1.00 | 5.0E-05 | 1.2E-03 | 10.5 5.9E-07 OK|
+----------------------+------+---------+---------+------------------+
----------------------------------------------------------------------
COEFFICIENT LOOP ITERATION = 2 CPU SECONDS = 2.346E+06
----------------------------------------------------------------------
| Equation | Rate | RMS Res | Max Res | Linear Solution |
+----------------------+------+---------+---------+------------------+
| U-Mom | 1.35 | 9.3E-05 | 2.6E-03 | 5.5E-01 ok|
| V-Mom | 1.35 | 9.0E-05 | 2.3E-03 | 5.8E-01 ok|
| W-Mom | 0.51 | 9.8E-05 | 3.6E-03 | 5.2E-01 ok|
| P-Mass | 2.70 | 5.7E-03 | 5.6E-02 | 12.5 7.6E-02 OK|
+----------------------+------+---------+---------+------------------+
| Ax-Mag-Fluid Domain | 0.00 | 2.0-134 | 8.8E-69 | 0.0E+00 OK|
| Ay-Mag-Fluid Domain | 0.00 | 2.2-134 | 1.3E-68 | 0.0E+00 OK|
| Az-Mag-Fluid Domain | 0.00 | 6.9-134 | 1.6E-68 | 0.0E+00 OK|
| Ax-Mag-Solid Domain | 0.00 | 1.7-134 | 3.4E-69 | 0.0E+00 OK|
| Ay-Mag-Solid Domain | 0.00 | 2.2-134 | 6.8E-69 | 0.0E+00 OK|
| Az-Mag-Solid Domain | 0.00 | 2.6-134 | 6.6E-69 | 0.0E+00 OK|
| Ax-Mag-Solid Domain | 0.00 | 2.1E-71 | 1.3E-70 | 0.0E+00 OK|
| Ay-Mag-Solid Domain | 0.00 | 2.8E-71 | 1.7E-70 | 0.0E+00 OK|
| Az-Mag-Solid Domain | 0.00 | 1.9E-70 | 8.7E-70 | 5.2 0.0E+00 OK|
+----------------------+------+---------+---------+------------------+
| E-Pot-Fluid Domain | 0.00 | 8.2E-78 | 7.6E-76 | 0.0E+00 OK|
| E-Pot-Solid Domain E | 0.00 | 6.2E-91 | 4.4E-90 | 0.0E+00 OK|
| E-Pot-Solid Domain E | 0.00 | 6.6E-78 | 7.7E-77 | 5.4 0.0E+00 OK|
+----------------------+------+---------+---------+------------------+
| H-Energy | 0.31 | 1.5E-04 | 6.1E-03 | 1.1E-05 OK|
| T-Energy-Solid Domai | 0.50 | 5.8E-06 | 2.0E-04 | 1.1E-05 OK|
| T-Energy-Solid Domai | 0.50 | 2.7E-05 | 1.6E-04 | 5.5 1.1E-05 OK|
+----------------------+------+---------+---------+------------------+
| K-TurbKE | 0.49 | 1.3E-04 | 2.7E-03 | 5.5 3.0E-05 OK|
| E-Diss.K | 1.24 | 6.2E-05 | 2.3E-03 | 10.5 1.7E-06 OK|
+----------------------+------+---------+---------+------------------+
----------------------------------------------------------------------
COEFFICIENT LOOP ITERATION = 3 CPU SECONDS = 2.347E+06
----------------------------------------------------------------------
| Equation | Rate | RMS Res | Max Res | Linear Solution |
+----------------------+------+---------+---------+------------------+
| U-Mom | 0.94 | 8.7E-05 | 2.3E-03 | 2.9E-01 ok|
| V-Mom | 1.07 | 9.7E-05 | 3.4E-03 | 2.8E-01 ok|
| W-Mom | 0.95 | 9.4E-05 | 4.7E-03 | 2.5E-01 ok|
| P-Mass | 0.62 | 3.5E-03 | 6.4E-02 | 12.5 6.0E-02 OK|
+----------------------+------+---------+---------+------------------+
| Ax-Mag-Fluid Domain | 0.00 | 3.8E-02 | 1.5E-02 | 3.9E-02 OK|
| Ay-Mag-Fluid Domain | 0.00 | 4.1E-02 | 2.1E-02 | 5.8E-02 OK|
| Az-Mag-Fluid Domain | 0.00 | 7.0E-02 | 2.7E-02 | 7.8E-02 OK|
| Ax-Mag-Solid Domain | 0.00 | 2.4E-02 | 7.0E-03 | 3.9E-02 OK|
| Ay-Mag-Solid Domain | 0.00 | 3.1E-02 | 1.1E-02 | 5.8E-02 OK|
| Az-Mag-Solid Domain | 0.00 | 2.9E-02 | 8.7E-03 | 7.8E-02 OK|
| Ax-Mag-Solid Domain | 0.00 | 5.4E-05 | 5.6E-04 | 3.9E-02 OK|
| Ay-Mag-Solid Domain | 0.00 | 6.9E-05 | 5.8E-04 | 5.8E-02 OK|
| Az-Mag-Solid Domain | 0.00 | 6.4E-04 | 2.4E-03 | 30.5 7.8E-02 OK|
+----------------------+------+---------+---------+------------------+

+--------------------------------------------------------------------+
| ERROR #004100018 has occurred in subroutine FINMES. |
| Message: |
| Fatal overflow in linear solver. |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| An error has occurred in cfx5solve: |
| |
| The ANSYS CFX solver could not be started, or exited with return |
| code 255. No results file has been created. |
+--------------------------------------------------------------------+


Timestep:1e-3
Adaptive Timestepping Information |
----------------------------------------------------------------------
| Direction | Ratio | Last Value | Next Value | RMS Co | Max Co |
+----------------+-------+------------+------------+--------+--------+
| Decreasing | 0.800 | 1.0000E-03 | 8.0000E-04 | 0.85 | 2.88 |
+----------------+-------+------------+------------+--------+--------+

================================================== ====================
TIME STEP = 3158 SIMULATION TIME = 2.0626E-01 CPU SECONDS = 8.342E+06
(THIS RUN: 198 1.0138E-01 5.335E+05)
----------------------------------------------------------------------
COEFFICIENT LOOP ITERATION = 1 CPU SECONDS = 5.335E+05
----------------------------------------------------------------------
| Equation | Rate | RMS Res | Max Res | Linear Solution |
+----------------------+------+---------+---------+------------------+
| U-Mom | 1.01 | 2.4E-04 | 4.2E-03 | 8.8E-02 OK|
| V-Mom | 0.95 | 2.4E-04 | 2.8E-03 | 8.2E-02 OK|
| W-Mom | 1.22 | 5.6E-04 | 2.4E-03 | 6.7E-02 OK|
| P-Mass | 0.96 | 6.6E-04 | 4.5E-03 | 31.6 8.1E-02 OK|
+----------------------+------+---------+---------+------------------+
| Ax-Mag-Fluid Domain | 0.00 | 2.0E-02 | 7.4E-03 | 2.6E-02 OK|
| Ay-Mag-Fluid Domain | 0.00 | 1.7E-02 | 8.4E-03 | 4.3E-02 OK|
| Az-Mag-Fluid Domain | 0.00 | 8.3E-02 | 1.1E-02 | 9.3E-02 OK|
| Ax-Mag-Solid Domain | 0.00 | 6.6E-03 | 3.9E-03 | 2.6E-02 OK|
| Ay-Mag-Solid Domain | 0.00 | 1.4E-02 | 7.7E-03 | 4.3E-02 OK|
| Az-Mag-Solid Domain | 0.00 | 1.9E-02 | 8.2E-03 | 9.3E-02 OK|
| Ax-Mag-Solid Domain | 0.00 | 8.1E-05 | 6.2E-04 | 2.6E-02 OK|
| Ay-Mag-Solid Domain | 0.00 | 7.7E-05 | 6.2E-04 | 4.3E-02 OK|
| Az-Mag-Solid Domain | 0.00 | 5.1E-04 | 2.3E-03 | 34.7 9.3E-02 OK|
+----------------------+------+---------+---------+------------------+
| E-Pot-Fluid Domain | 0.00 | 2.7E-04 | 2.5E-02 | 6.0E+00 F |
| E-Pot-Solid Domain E | 0.00 | 1.4E-17 | 1.0E-16 | 6.0E+00 F |
| E-Pot-Solid Domain E | 0.00 | 7.9E-05 | 6.0E-04 | 14.3 6.0E+00 F |
+----------------------+------+---------+---------+------------------+
| H-Energy | 0.99 | 2.1E-03 | 5.7E-02 | 2.2E-03 OK|
| T-Energy-Solid Domai | 0.87 | 9.9E-05 | 3.5E-03 | 2.2E-03 OK|
| T-Energy-Solid Domai | 0.89 | 4.2E-04 | 2.6E-03 | 5.5 2.2E-03 OK|
+----------------------+------+---------+---------+------------------+
| K-TurbKE | 0.98 | 9.7E-04 | 1.6E-02 | 5.5 4.7E-03 OK|
| E-Diss.K | 0.89 | 1.3E-03 | 6.3E-02 | 10.6 1.2E-03 OK|
+----------------------+------+---------+---------+------------------+
----------------------------------------------------------------------
COEFFICIENT LOOP ITERATION = 2 CPU SECONDS = 5.338E+05
----------------------------------------------------------------------
| Equation | Rate | RMS Res | Max Res | Linear Solution |
+----------------------+------+---------+---------+------------------+
| U-Mom | 1.56 | 3.8E-04 | 1.7E-02 | 1.2E-01 ok|
| V-Mom | 1.61 | 3.8E-04 | 1.8E-02 | 1.1E-01 ok|
| W-Mom | 0.79 | 4.4E-04 | 1.5E-02 | 7.2E-02 OK|
| P-Mass | 1.09 | 7.2E-04 | 1.3E-02 | 16.3 9.8E-02 OK|
+----------------------+------+---------+---------+------------------+
| Ax-Mag-Fluid Domain | 0.95 | 1.9E-02 | 7.4E-03 | 2.4E-02 OK|
| Ay-Mag-Fluid Domain | 1.00 | 1.7E-02 | 9.5E-03 | 4.5E-02 OK|
| Az-Mag-Fluid Domain | 1.21 | 1.0E-01 | 1.2E-02 | 8.8E-02 OK|
| Ax-Mag-Solid Domain | 1.27 | 8.3E-03 | 3.0E-03 | 2.4E-02 OK|
| Ay-Mag-Solid Domain | 0.95 | 1.3E-02 | 6.3E-03 | 4.5E-02 OK|
| Az-Mag-Solid Domain | 0.73 | 1.4E-02 | 4.9E-03 | 8.8E-02 OK|
| Ax-Mag-Solid Domain | 1.02 | 8.3E-05 | 6.7E-04 | 2.4E-02 OK|
| Ay-Mag-Solid Domain | 0.92 | 7.1E-05 | 6.1E-04 | 4.5E-02 OK|
| Az-Mag-Solid Domain | 0.87 | 4.4E-04 | 2.3E-03 | 38.9 8.8E-02 OK|
+----------------------+------+---------+---------+------------------+

+--------------------------------------------------------------------+
| ERROR #004100018 has occurred in subroutine FINMES. |
| Message: |
| Fatal overflow in linear solver. |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| An error has occurred in cfx5solve: |
| |
| The ANSYS CFX solver exited with return code 2. No results file |
| has been created. |
+--------------------------------------------------------------------+

End of solution stage.
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Old   October 13, 2016, 05:34
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Have you tried the general tips in the FAQ? http://www.cfd-online.com/Wiki/Ansys...do_about_it.3F
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Old   October 13, 2016, 06:58
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Zhen
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Yes, but I don't think the link provide useful information in my case. Thank you for the link!
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