Radiation and Convection at the same surface

Hello Everybody,

Is it possible to apply convection and radiation on the same surface in Creo 4.0?

In reality both effects occure in the same time. So I would like to combine them.

I tried to create touching objects (of air and the solid object) at the surface but this does not work either.

Would be very glad to get a solution for my problem

Best Regards