you don't mix the two materials, do you? if not, that means you put a separate zone for each, then you can define a temperature for each one.

thanks hayder. i have defined them as different zones right from the design modeler. but when i go to the cell zone conditions, it just gives me one value of boussinesq temperature to be specified. can you be a bit more specific how can i define the two zones.

I agree with Hayder