I have a compressible model and would like to define a simple power law for the viscosity as a function of the temperature ratio (Tk/Trefk). When I go into the user expression, TempK is not one of the options available for Predefined Symbols.
In fact, even the examples tab has examples which use TempK as part of the equation. These examples give me an error when I paste them into User Expression. Error is: identifier TempK is unknown.
How do I use temperature for my equation?
Stefan
Variable viscosity mathematical expression editor
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Yvan Fournier
- Posts: 4208
- Joined: Mon Feb 20, 2012 3:25 pm
Re: Variable viscosity mathematical expression editor
Hello,
I'll check next week if it is easy or not to add the temperature to the GUI here (if it is available as a property in this model, it should be easy; if it requires a user-defined temperature/enthalpy conversion, it may be harder).
In the meantime, the only solution seems to be to recourse to using the cs_user_physical_properties.f90 user subroutines for the variables depending on temperature...
Regards,
Yvan
I'll check next week if it is easy or not to add the temperature to the GUI here (if it is available as a property in this model, it should be easy; if it requires a user-defined temperature/enthalpy conversion, it may be harder).
In the meantime, the only solution seems to be to recourse to using the cs_user_physical_properties.f90 user subroutines for the variables depending on temperature...
Regards,
Yvan