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Thermodynamics database

    • sjohn
      Subscriber

      What do "70590" and "62987" stand for? I got this screenshot from the Fluent User guide Figure 2.1. In Table 2.1, it says "date" but notused in the bracket.

      When I created my owndatabase following this format, I get this message in chemout -

      TOO MANY DATA ITEMS.  NUMBER EXPECTED =  1
            Error...failure reading fit temperatures 
                    species: H2O
                    thermo data line: H2O               091919H2 O1               L300.000   800.000 600.000         1
                    columns 56-65: 800.000 60
            Error...fit temperatures are not in ascending order,
                    species: H2O
                    thermo data line: H2O               091919H2 O1               L300.000   800.000 600.000         1                                                                                                                                                                                   
            values found are:
         300.000000000000       0.000000000000000E+000   800.000000000000     

    • jcooper
      Ansys Employee

      Hi sjohn:

       

      The thermodynamic database has a strict format with regards to what items are in what columns.  I don't think the numbers matter so long as the required information is in the right columns.

      It looks like the last digit in the last temperature is too close to the 1 at the end of the first data row, so the temperatures are being truncated.  Can you please attach a sample of your thermo file that contains the problem lines?

      Please note that the thermo header also makes a difference - THERMO vs. THERMO ALL.

      If temperature ranges are to be specified separately for each specie, the header usually has a temperature range that will apply if none is specified:

       

    • sjohn
      Subscriber

      Thanks for reply. I had solved this issue last month by removing the common temperature range under THERMO.

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