On domains the total heat flux, tflux, corresponds to the conductive and convective heat flux. For accuracy reasons the radiative heat flux is not included.
The conductive heat flux variable, dflux, is evaluated using the temperature gradient and the effective thermal conductivity:
In the general case keff is the thermal conductivity,
k.
For heat transfer in fluids with turbulent flow, keff =
k +
kT, where
kT is the turbulent thermal conductivity.
For heat transfer in porous media, keff is the effective conductivity computed from the solid and fluid conductivities.
The convective heat flux variable, cflux, is defined using the internal energy,
E:
The total energy flux, teflux, is defined when viscous dissipation is enabled:
