Rene,
I wonder if the unreasonably high heat flux values could be due to the inclusion of the stabilization term in the computation of heat flow? I remember some time ago that a decision was made to calculate heat fluxes using the product of the temperature gradient and the max(artificial viscosity,kThermal) where kThermal is the physical thermal conductivity. Is this being done also for SUPG, and does the SUPG stabilization parameter have the same physical units as thermal conductivity?
Max