Hi. I have some physic properties, such as Specific Heat, Diffusion Coefficient, Viscosity, Thermal Conductivity and all of them are in function of temperature. I have the equations i have to implement here. SO how can I implement this equations in an UDF file? Does anybody have one model of it? Thanks

i am still new at this, but as far as i am concerned, you can define the function at C+ with specific identity format,that is accepted by fluent, import the profile,therefore making it available at corresponding list. hope you can get it done!

Use DEFINE_PROPERTY function. You can find examples in documentation.