When using an ideal gas in CFX, the enthalpy and entropy values are related to the reference values based on a reference pressure and temperature. By default, the values are taken as zero at standard pressure and temperature. You can modify these reference values under the Material Properties tab of the material if you wish to see enthalpy and entropy values closer to the Refprop values. Changing these reference values won't have any impact on the solution in terms of the resulting pressure and velocity fields.
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