How to simulate heat transfer without convection and conduction?

Hello all,

I am having a problem with the heat transfer component of Flow Simulation. What I have is a hollow cylinder with a radiation source from one end and I would like to see what happens in the walls of the cylinder. From what I have read, convection is automatically taken into account.  My only problem is I don't want to consider the effects of convection and conduction. How do I do that in this situation?

Thank You

SolidworksFlow Simulation