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This is what you should currently see under Models.

 
Now let's move on to setting up the materials properties.set the "material properties" i.e. properties of air that appear in the governing equations.

Materials > Fluid air >  Create/Edit...

We will use the properties of heated air. Change the Density (kg/m3) from constant to incompressible-ideal-gas.

We will use the properties of heated air. Enter for following properties for air.
Cp (Specific Heat) (j/kg-k): 1005
Thermal Conductivity (w/m-k): 0.0266
Viscosity (kg/m-s): 1.787e-5
Molecular Weight (kg/kgmol): 28.97
 

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