Applying the boundary condition or not, with the patch command the result is the same. If I set the boundary condition without applying the patch command, it shows me the body at 303 K (as shown in the following screenshot). In reality, T_boby = 1300 K is an initial condition and not a boundary one, but on the various tutorials I' ve found, none of them mention how to apply an initial condition (for example T (t = 0) = 1300 K). As I had already written, I tried to set the temperature of the specimen in Cell Zone Conditions -> Solid -> heatcube too, but from what I saw, I can set a fixed temperature valuenn