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#1 |
New Member
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Join Date: Jul 2018
Location: Germany
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Hi,
I am doing transient Simulation with Interpolation of H2, O2, N2 and H20. Simulation is getting converged, but, during Simulation I am getting following table which shows the Error Red Marked in .out file -bounding box. Is there anyway to avoid this table? I have turned on extension of variable upper and lower limit also. ================================================== ==================== | Adaptive Timestepping Information | ---------------------------------------------------------------------- | Direction | Ratio | Last Value | Next Value | RMS Co | Max Co | +----------------+-------+------------+------------+--------+--------+ | Unchanged | 1.000 | 5.0000E-04 | 5.0000E-04 | 0.41 | 40.12 | +----------------+-------+------------+------------+--------+--------+ ================================================== ==================== TIME STEP = 6 SIMULATION TIME = 7.8500E-03 CPU SECONDS = 5.973E+03 ---------------------------------------------------------------------- COEFFICIENT LOOP ITERATION = 1 CPU SECONDS = 5.973E+03 ---------------------------------------------------------------------- | Equation | Rate | RMS Res | Max Res | Linear Solution | +----------------------+------+---------+---------+------------------+ | U-Mom | 0.81 | 3.6E-04 | 5.7E-02 | 3.0E-04 OK| | V-Mom | 0.81 | 1.7E-04 | 1.1E-02 | 6.1E-04 OK| | W-Mom | 0.83 | 1.6E-04 | 1.4E-02 | 6.2E-04 OK| | P-Mass | 0.97 | 4.1E-05 | 3.4E-03 | 4.8 8.8E-04 OK| +----------------------+------+---------+---------+------------------+ | H-Energy | 0.76 | 3.4E-04 | 3.2E-02 | 7.6E-06 OK| | T-Energy | 1.00 | 2.9E-09 | 9.9E-08 | 5.6 7.6E-06 OK| +----------------------+------+---------+---------+------------------+ | K-TurbKE | 0.55 | 8.8E-05 | 1.8E-02 | 5.5 2.3E-05 OK| | O-TurbFreq | 0.16 | 1.6E-05 | 5.5E-03 | 10.8 2.0E-08 OK| +----------------------+------+---------+---------+------------------+ | H2-Mass Fraction | 0.00 | 0.0E+00 | 0.0E+00 | 5.5 0.0E+00 OK| | H2O-Mass Fraction | 0.76 | 3.5E-04 | 3.3E-02 | 5.5 6.2E-06 OK| | O2-Mass Fraction | 0.76 | 3.5E-04 | 3.3E-02 | 5.5 6.2E-06 OK| +----------------------+------+---------+---------+------------------+ ---------------------------------------------------------------------- COEFFICIENT LOOP ITERATION = 2 CPU SECONDS = 6.079E+03 ---------------------------------------------------------------------- | Equation | Rate | RMS Res | Max Res | Linear Solution | +----------------------+------+---------+---------+------------------+ | U-Mom | 0.48 | 1.7E-04 | 2.5E-02 | 5.8E-04 OK| | V-Mom | 0.11 | 1.8E-05 | 1.7E-03 | 2.1E-03 OK| | W-Mom | 0.11 | 1.8E-05 | 1.9E-03 | 2.2E-03 OK| | P-Mass | 0.69 | 2.9E-05 | 6.4E-03 | 4.8 5.7E-04 OK| +----------------------+------+---------+---------+------------------+ | H-Energy | 0.17 | 5.7E-05 | 7.9E-03 | 1.3E-05 OK| | T-Energy | 1.00 | 2.9E-09 | 9.8E-08 | 5.6 1.3E-05 OK| +----------------------+------+---------+---------+------------------+ | K-TurbKE | 2.15 | 1.9E-04 | 3.0E-02 | 5.5 2.1E-05 OK| | O-TurbFreq | 3.50 | 5.7E-05 | 1.7E-02 | 10.8 2.5E-08 OK| +----------------------+------+---------+---------+------------------+ | H2-Mass Fraction | 0.00 | 0.0E+00 | 0.0E+00 | 5.5 0.0E+00 OK| | H2O-Mass Fraction | 0.16 | 5.7E-05 | 8.0E-03 | 5.5 1.2E-05 OK| | O2-Mass Fraction | 0.16 | 5.7E-05 | 8.0E-03 | 5.5 1.2E-05 OK| +----------------------+------+---------+---------+------------------+ ---------------------------------------------------------------------- COEFFICIENT LOOP ITERATION = 3 CPU SECONDS = 6.184E+03 ---------------------------------------------------------------------- | Equation | Rate | RMS Res | Max Res | Linear Solution | +----------------------+------+---------+---------+------------------+ | U-Mom | 0.32 | 5.6E-05 | 4.3E-03 | 7.7E-04 OK| | V-Mom | 0.72 | 1.3E-05 | 1.8E-03 | 2.4E-03 OK| | W-Mom | 0.65 | 1.2E-05 | 1.3E-03 | 2.3E-03 OK| | P-Mass | 0.70 | 2.0E-05 | 2.1E-03 | 4.8 7.5E-04 OK| +----------------------+------+---------+---------+------------------+ | H-Energy | 0.63 | 3.6E-05 | 3.1E-03 | 7.6E-05 OK| | T-Energy | 1.00 | 2.9E-09 | 9.8E-08 | 5.6 7.6E-05 OK| +----------------------+------+---------+---------+------------------+ | K-TurbKE | 0.28 | 5.3E-05 | 1.2E-02 | 5.5 3.2E-06 OK| | O-TurbFreq | 0.53 | 3.0E-05 | 9.2E-03 | 10.8 3.2E-08 OK| +----------------------+------+---------+---------+------------------+ | H2-Mass Fraction | 0.00 | 0.0E+00 | 0.0E+00 | 5.5 0.0E+00 OK| | H2O-Mass Fraction | 0.63 | 3.5E-05 | 3.1E-03 | 5.5 6.6E-05 OK| | O2-Mass Fraction | 0.63 | 3.5E-05 | 3.1E-03 | 5.5 6.6E-05 OK| +----------------------+------+---------+---------+------------------+ ---------------------------------------------------------------------- COEFFICIENT LOOP ITERATION = 4 CPU SECONDS = 6.290E+03 ---------------------------------------------------------------------- | Equation | Rate | RMS Res | Max Res | Linear Solution | +----------------------+------+---------+---------+------------------+ | U-Mom | 0.62 | 3.5E-05 | 5.4E-03 | 2.1E-03 OK| | V-Mom | 0.71 | 9.4E-06 | 1.7E-03 | 7.1E-03 OK| | W-Mom | 0.66 | 7.7E-06 | 1.2E-03 | 7.1E-03 OK| | P-Mass | 0.65 | 1.3E-05 | 1.2E-03 | 4.8 1.4E-03 OK| +----------------------+------+---------+---------+------------------+ | H-Energy | 0.38 | 1.4E-05 | 1.2E-03 | 8.1E-05 OK| | T-Energy | 1.00 | 2.9E-09 | 9.8E-08 | 5.6 8.1E-05 OK| +----------------------+------+---------+---------+------------------+ | K-TurbKE | 0.71 | 3.8E-05 | 8.4E-03 | 5.5 1.3E-05 OK| | O-TurbFreq | 0.74 | 2.3E-05 | 9.4E-03 | 10.8 1.6E-08 OK| +----------------------+------+---------+---------+------------------+ | H2-Mass Fraction | 0.00 | 0.0E+00 | 0.0E+00 | 5.5 0.0E+00 OK| | H2O-Mass Fraction | 0.36 | 1.3E-05 | 1.2E-03 | 5.5 7.1E-05 OK| | O2-Mass Fraction | 0.36 | 1.3E-05 | 1.2E-03 | 5.5 7.1E-05 OK| +----------------------+------+---------+---------+------------------+ ---------------------------------------------------------------------- COEFFICIENT LOOP ITERATION = 5 CPU SECONDS = 6.398E+03 ---------------------------------------------------------------------- | Equation | Rate | RMS Res | Max Res | Linear Solution | +----------------------+------+---------+---------+------------------+ | U-Mom | 0.55 | 1.9E-05 | 2.6E-03 | 2.4E-03 OK| | V-Mom | 0.59 | 5.5E-06 | 1.1E-03 | 6.8E-03 OK| | W-Mom | 0.63 | 4.8E-06 | 8.7E-04 | 6.9E-03 OK| | P-Mass | 0.51 | 6.6E-06 | 7.9E-04 | 4.8 1.6E-03 OK| +----------------------+------+---------+---------+------------------+ | H-Energy | 0.63 | 8.6E-06 | 1.1E-03 | 9.5E-05 OK| | T-Energy | 1.00 | 2.9E-09 | 9.8E-08 | 5.6 9.5E-05 OK| +----------------------+------+---------+---------+------------------+ | K-TurbKE | 0.83 | 3.1E-05 | 5.1E-03 | 5.5 1.7E-05 OK| | O-TurbFreq | 0.61 | 1.4E-05 | 4.6E-03 | 10.8 1.3E-08 OK| +----------------------+------+---------+---------+------------------+ | H2-Mass Fraction | 0.00 | 0.0E+00 | 0.0E+00 | 5.5 0.0E+00 OK| | H2O-Mass Fraction | 0.60 | 7.8E-06 | 8.0E-04 | 5.5 7.0E-05 OK| | O2-Mass Fraction | 0.60 | 7.8E-06 | 8.0E-04 | 5.5 7.0E-05 OK| +----------------------+------+---------+---------+------------------+ ---------------------------------------------------------------------- COEFFICIENT LOOP ITERATION = 6 CPU SECONDS = 6.503E+03 ---------------------------------------------------------------------- | Equation | Rate | RMS Res | Max Res | Linear Solution | +----------------------+------+---------+---------+------------------+ | U-Mom | 0.71 | 1.4E-05 | 2.9E-03 | 1.9E-03 OK| | V-Mom | 0.69 | 3.8E-06 | 7.1E-04 | 4.6E-03 OK| | W-Mom | 0.69 | 3.3E-06 | 6.7E-04 | 4.7E-03 OK| | P-Mass | 0.62 | 4.1E-06 | 5.6E-04 | 4.8 1.5E-03 OK| +----------------------+------+---------+---------+------------------+ | H-Energy | 0.80 | 6.9E-06 | 7.4E-04 | 1.2E-04 OK| | T-Energy | 1.00 | 2.9E-09 | 9.8E-08 | 5.6 1.2E-04 OK| +----------------------+------+---------+---------+------------------+ | K-TurbKE | 0.67 | 2.1E-05 | 3.7E-03 | 5.5 1.2E-05 OK| | O-TurbFreq | 0.93 | 1.3E-05 | 5.3E-03 | 10.8 1.7E-08 OK| +----------------------+------+---------+---------+------------------+ | H2-Mass Fraction | 0.00 | 0.0E+00 | 0.0E+00 | 5.5 0.0E+00 OK| | H2O-Mass Fraction | 0.81 | 6.3E-06 | 6.9E-04 | 5.5 9.4E-05 OK| | O2-Mass Fraction | 0.81 | 6.3E-06 | 6.9E-04 | 5.5 9.1E-05 OK| +----------------------+------+---------+---------+------------------+ ---------------------------------------------------------------------- COEFFICIENT LOOP ITERATION = 7 CPU SECONDS = 6.608E+03 ---------------------------------------------------------------------- | Equation | Rate | RMS Res | Max Res | Linear Solution | +----------------------+------+---------+---------+------------------+ | U-Mom | 0.73 | 9.9E-06 | 1.9E-03 | 1.0E-03 OK| | V-Mom | 0.77 | 2.9E-06 | 5.0E-04 | 4.1E-03 OK| | W-Mom | 0.74 | 2.5E-06 | 4.2E-04 | 4.1E-03 OK| | P-Mass | 0.66 | 2.7E-06 | 4.3E-04 | 4.8 1.7E-03 OK| +----------------------+------+---------+---------+------------------+ | H-Energy | 0.74 | 5.1E-06 | 5.9E-04 | 2.0E-04 OK| | T-Energy | 1.00 | 2.9E-09 | 9.8E-08 | 5.6 2.0E-04 OK| +----------------------+------+---------+---------+------------------+ | K-TurbKE | 0.78 | 1.6E-05 | 3.0E-03 | 5.5 1.2E-05 OK| | O-TurbFreq | 0.74 | 9.5E-06 | 3.5E-03 | 10.8 2.7E-08 OK| +----------------------+------+---------+---------+------------------+ | H2-Mass Fraction | 0.00 | 0.0E+00 | 0.0E+00 | 5.5 0.0E+00 OK| | H2O-Mass Fraction | 0.74 | 4.7E-06 | 4.3E-04 | 5.5 1.4E-04 OK| | O2-Mass Fraction | 0.74 | 4.7E-06 | 4.3E-04 | 5.5 1.3E-04 OK| +----------------------+------+---------+---------+------------------+ +--------------------------------------------------------------------+ | Table bounds warnings at: END OF TIME STEP | +--------------------------------------------------------------------+ +--------------------------------------------------------------------+ | | | Independent variables went out of bounds while computing the | | variables listed below using table interpolation. In each case | | the bounds error was handled by clipping or extrapolation. | | If this situation persists, consider increasing the table range. | | | +--------------------------------------------------------------------+ | | | Location Name : Atmosphaere | | Mesh location : IELG39/VERTEX | | Routine : MASSOU_CALPROP | | Partition : 1 | | Variable Name : O2.Static Enthalpy | | Ind. Variable : Temperature | | Bound : Lower | | Min Value : 0.0000E+00 | | Handled By : Extrapolation | | | +--------------------------------------------------------------------+ | | | Location Name : Atmosphaere | | Mesh location : IELG39/VERTEX | | Routine : MASSOU_CALPROP | | Partition : 1 | | Variable Name : H2.Static Enthalpy | | Ind. Variable : Temperature | | Bound : Lower | | Min Value : 0.0000E+00 | | Handled By : Extrapolation | | | +--------------------------------------------------------------------+ | | | Location Name : Atmosphaere | | Mesh location : IELG39/VERTEX | | Routine : MASSOU_CALPROP | | Partition : 1 | | Variable Name : N2.Static Enthalpy | | Ind. Variable : Temperature | | Bound : Lower | | Min Value : 0.0000E+00 | | Handled By : Extrapolation | | | +--------------------------------------------------------------------+ +--------------------------------------------------------------------+ | Notice: The maximum Mach number is 3.325E+00. | +--------------------------------------------------------------------+ Any suggestion will be helpful. |
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#2 |
Senior Member
Join Date: Jun 2009
Posts: 1,850
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Not sure what you mean by removing the error messages. I will assume you meant how to make the solution robust, such as there are no errors of any kind.
You may have to describe what you are modeling in more detail. So far from the error message, and the output provided you are:
What model are you using for the individual materials in the mixture? How are the table generation limits being set? Once the temperature conversion starts going towards 0, it means you have a large sink (perhaps due convergence issues) in the system and the system is cooling down toooo fast. |
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#3 |
New Member
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Join Date: Jul 2018
Location: Germany
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Yes, in normal case those H2.Static Enthalpy, N2 and O2 should not coming during Simulation. I have already given wide range of dynamic viscosity, thermal conductivity and specific heat capasity with function of temperature (ranging: -25 to 2000 [°C] ).
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#4 |
New Member
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Join Date: Jul 2018
Location: Germany
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Finally, I found solution.
The atmosphere Domain has been generated with two part- 1) Atmosphere Default 2) Atmosphere Comb In the second Domain, the source term has been set default with 0 [K] initialization, so these tables were generated; Problem has been solved with setting to intial boundary condition with 30 [°C]. Thank you for support "Opaque", Hemish Mistry |
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cfx 19.2 |
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