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CFX Electric Potential Equation Residual Problem |
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October 4, 2016, 03:38 |
CFX Electric Potential Equation Residual Problem
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New Member
Zhen
Join Date: Oct 2016
Posts: 4
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Hallo Everyone,
I am doing simulation of free burning arc with CFX. I meet a prolem with the Electric Potential Equation Residual. I set my convergence criterion to 1e-4. At first all the residuals are quite good and the adaptive time steps keep increasing. But after some time, all the other residuals are quite ok far below 1e-4, but only the Electric Potential Equation Residual is above 1e-4 which makes the adaptive time step doesn't work to increase my time step and stay constant at 1e-7s. It is too slow for my simulation. Could anyone help me how to solve this problem? Thank you very much! The out file data is as follows COEFFICIENT LOOP ITERATION = 20 CPU SECONDS = 1.722E+06 ---------------------------------------------------------------------- | Equation | Rate | RMS Res | Max Res | Linear Solution | +----------------------+------+---------+---------+------------------+ | U-Mom | 0.99 | 1.6E-10 | 6.7E-08 | 8.1E-04 OK| | V-Mom | 1.00 | 1.9E-10 | 1.1E-07 | 8.0E-04 OK| | W-Mom | 0.97 | 8.8E-11 | 4.7E-08 | 8.0E-04 OK| | P-Mass | 1.00 | 1.1E-09 | 6.3E-07 | 4.9 1.1E-04 OK| +----------------------+------+---------+---------+------------------+ | Ax-Mag-Air | 0.39 | 5.7E-17 | 8.4E-10 | 7.7E-02 OK| | Ay-Mag-Air | 0.35 | 1.6E-17 | 3.9E-10 | 7.9E-02 OK| | Az-Mag-Air | 0.36 | 1.2E-16 | 1.0E-09 | 9.6E-02 OK| | Ax-Mag-EleB | 0.49 | 2.2E-18 | 5.8E-10 | 7.7E-02 OK| | Ay-Mag-EleB | 0.57 | 9.2E-18 | 1.7E-09 | 7.9E-02 OK| | Az-Mag-EleB | 0.59 | 1.4E-17 | 2.2E-09 | 9.6E-02 OK| | Ax-Mag-EleT | 0.78 | 1.9E-11 | 1.7E-09 | 7.7E-02 OK| | Ay-Mag-EleT | 0.78 | 1.4E-11 | 1.1E-09 | 7.9E-02 OK| | Az-Mag-EleT | 0.79 | 2.3E-11 | 2.1E-09 | 39.0 9.6E-02 OK| +----------------------+------+---------+---------+------------------+ | E-Pot-Air | 1.05 | 5.7E-04 | 1.7E-01 | 8.2E-02 OK| | E-Pot-EleB | 0.78 | 5.6E-11 | 5.2E-09 | 8.2E-02 OK| | E-Pot-EleT | 0.79 | 2.0E-16 | 1.4E-14 | 14.3 8.2E-02 OK| +----------------------+------+---------+---------+------------------+ | H-Energy | 0.99 | 7.3E-11 | 4.6E-08 | 6.0E-09 OK| | T-Energy-EleB | 0.50 | 1.4E-11 | 4.5E-10 | 6.0E-09 OK| | T-Energy-EleT | 0.50 | 2.3E-11 | 8.7E-10 | 5.6 6.0E-09 OK| +----------------------+------+---------+---------+------------------+ | K-TurbKE | 0.98 | 2.1E-11 | 7.8E-09 | 5.6 1.8E-09 OK| | E-Diss.K | 0.97 | 1.3E-11 | 4.6E-09 | 10.6 9.7E-13 OK| +----------------------+------+---------+---------+------------------+ ================================================== ==================== | Adaptive Timestepping Information | ---------------------------------------------------------------------- | Direction | Ratio | Last Value | Next Value | RMS Co | Max Co | +----------------+-------+------------+------------+--------+--------+ | Unchanged | 1.000 | 1.0000E-07 | 1.0000E-07 | 0.02 | 0.22 | +----------------+-------+------------+------------+--------+--------+ |
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