Fluent journal - setting ideal gas

Franky

Hi ! I'm trying to set up my material with the journal. I wrote "define materials change air

air

ideal-gas

But Fluent wants me to fill in other parameters (Cp, sound speed...) and I want them to be set as default values. Do I have to set them up anyway ?

After, I want to set the opearting conditions, and if I stop at "ideal gas", "define operating-conditions" is understood as a Cp method !! (is there any command to simulate the "return key" or something equivalent?)

I hope my explanation was clear enough and you'll be able to help me !