heat generation problem
 

Dear all
I'm working on steady state heat transfer in a cylinderical encasement that is illustrated in attachment figure with a term of heat generation in inner layer of encasement and free water in outer surface of body.purpose of problem is calculation of h(heat convection coefficient) for various heat generation terms in inside..........after modeling of geometery my case and meshing i calculate the heat convection coefficient by ansys fluent but problem from that begins i change the heat source term quantity, afterwards i calculate h for new source term but it's amount does not vary.

if anyone has information on this case problem please help.
thank you for your attention.