DEFINE_PROPERTY udf question

Erik

I want to preface this by saying that I'm relatively new to using fluent and I have not written any udfs to date.

With that said, does anyone have an example of how to write a DEFINE_PROPERTY udf? I'm modeling liquid-liquid combustion using dense gases (I'm purposely neglecting droplet formation/vaporization for simplicity) and I want to specify liquid densities for my reactants (from a temperature dependent lookup table) and have fluent use the ideal gas law to calculate the density of the products. Has anyone out there done this before? Can you provide me with any pointers on how to do this?

Thanks,

Erik