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Error in subroutine EX_TABLE : Cannot create table for property ENTROPY

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Old   August 7, 2017, 05:01
Default Error in subroutine EX_TABLE : Cannot create table for property ENTROPY
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heesang Yoo
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+--------------------------------------------------------------------+
| Reference Pressure Information |
+--------------------------------------------------------------------+

Domain Group: activefuel

Pressure has not been set at any boundary conditions.
The pressure will be set to 5.06625E+05 at the following location:
Domain : activefuel
Node : 1 (equation 1)
Coordinates : (-1.07000E-01, 1.07000E-01, 8.57000E-02).

Domain Group: activefuel

Buoyancy has been activated. The absolute pressure will include
hydrostatic pressure contribution, using the following reference
coordinates: (-1.07000E-01, 1.07000E-01, 8.57000E-02).
----------------------------------
Error in subroutine EX_TABLE :
Cannot create table for property ENTROPY
GETVAR originally called by subroutine CAL_GVar

+--------------------------------------------------------------------+
| ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| Stopped in routine GV_ERROR |
| |
| |
| |
| |
| |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| An error has occurred in cfx5solve: |
| |
| The ANSYS CFX solver exited with return code 1. No results file |
| has been created. |
+--------------------------------------------------------------------+

End of solution stage.

+--------------------------------------------------------------------+
| The following user files have been saved in the directory |
| C:\Users\user\Desktop\grid\cfx\singlecell_001: |
| |
| pids, trace |
+--------------------------------------------------------------------+


This run of the ANSYS CFX Solver has finished.

----------------------------------------------------------------------------------

I couldn't solve this error for 2weeks.... I would very appreciate if you guys could help me solving error... thank you

Also, can not understand what that abbreviations mean GETVAR, GV_ERROR....
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Old   August 7, 2017, 08:16
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You have to look at the output file from the top. Don't get distracted by scary looking messages further down.

At the top it says you have not set the pressure. This could well be the source of the problem. Is this simulation in a closed cavity? Is it compressible? How is the pressure defined in the real device? And should you put the same pressure control device into your model?
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Old   August 7, 2017, 22:51
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Is this simulation in a closed cavity?-----------yes and in side there is porous media which is heatsource and other porous medias which is not.

Is it compressible? ---------yes

How is the pressure defined in the real device?--------5atm

And should you put the same pressure control device into your model?-----yes

thanks for reply
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Old   August 8, 2017, 01:31
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OK, so if the pressure it reports is acceptable then let's move to the next message. It says it cannot generate the entropy table. (The table is a look-up table containing the entropy versus temperature and pressure over a range of values. This is so the solver does not need to evaluate these properties at run-time but can just look up a table). Have you defined the thermal properties of the fluid at the range of temperatures and pressures you are using? Have a look at the material property tab and see what range of temperatures and pressures it is using for the table generation.

Also check properties like specific heat and thermal conductivity are defined.
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Old   August 8, 2017, 03:00
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The properties of materials that I used are all set.
Solid initial temperature is 500[K] and fluid initial temperature and pressure and 500[K] and 5atm. Those values are in range.

I first set initial temperature at 300[K]and after I saw your advice I changed to 500[K] but, this doesn't change the result

The same error has occurred.
Thanks for reply mr.

Oh, I made an mistake in writing molecular weight of UO2 but, I think it wouldn't be matter.
Attached Images
File Type: jpg property.jpg (121.3 KB, 13 views)
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Old   August 8, 2017, 06:47
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The most likely explanation of the error you are seeing is that an important property is not set somewhere. If it is not a material property then it could be a physical model parameter.
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Old   August 9, 2017, 13:15
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I'm not sure if this is your problem or not, but you can run into problems (thermodynamic inconsistencies) when setting both density and specific heat as variable.

To avoid this:
-have either density or specific heat constant
-use ideal gas to define density
-use real gas equation of state
-use an rgp file.

I used density and specific heat as both variable with argon gas, the model ran fine, but energy balance was off by ~50%, and when I plotted at entropy, it was something crazy, like 10000000000 kJ/kg.
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