sir, i am unable to understand how can i add new material property which is variable. Let me Define the problem clearly i am using new fluid and property of this new fluid is changing with respect to temperature and pressure. in my CFD simulation pressure is constant but temperature is changing from 300 to 1000 deg.and i want that during CFD simulation that should be used by fluent to get accurate result like heat transfer, density plot or any other plot. so how can i do this . thanks

This can easily be done in the Materials-panel for most properties. Standard ways of doing this is as piecewise linear or piecewise polynomial functions. If you already have an expression for the property then the easiest way is probably through a user-defined function. Good luck!

/Henrik