Could anyone please help me with coding an UDF in Fluent for thermal conductivity? The thermal conductivity is a function of two different temperatures: the translational-rotational and vibrational-electronic temperatures.
Should I create one function for each temperature dependency or can I include them both into one function?
Also, should I define both of them as:
float T = C_T(c, t); (for the translational-rotational temperature)
float Tve = C_T(c, t); (for the vibrational-electronic Temperature)
The temperature in FLUENT is a bulk temperature, it has nothing to do with rotational and vibrational temperatures from statistical thermodynamics.
I would speculate that If you do want to use vibrational and rotational temperatures for calculationg a temperature-dependent thermal conductivity that can be used in FLUENT, you would need to define such a thermal conductivity as a function of the bulk temperature, including the material-specific vibrational and rotational temperatures as parameters (constants):
k=k(T, Thetarot, Thetavib),
Thetarot, Thetavib : parameters (constants).
Such a function can be implemented as DEFINE_PROPERTY UDF as described here
https://www.sharcnet.ca/Software/Fluent6/html/udf/node43.htm
or here
https://www.sharcnet.ca/Software/Ansys/16.2.3/en-us/help/flu_udf/flu_udf_sec_define_property.html
hi
i need to write a udf function to define the thermal conductivity as a function of height for 3D model.
Can anyone help me please.
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