In
FLUENT, turbulent heat transport is modeled using the concept of
Reynolds' analogy to turbulent momentum transfer. The "modeled'' energy
equation is thus given by the following:
(12.3-18)
where
, in this case, is the thermal conductivity,
is the total energy,
and
is the deviatoric stress tensor, defined as
The term involving
represents the viscous heating, and
is always computed in the density-based solvers. It is not computed by default in the
pressure-based solver, but it can be enabled in the
Viscous
Model panel. The default value of the turbulent Prandtl
number is 0.85. You can change the value of Pr
in the
Viscous
Model panel.
Turbulent mass transfer is treated similarly, with a default turbulent Schmidt
number of 0.7. This default value can be changed in the
Viscous
Model panel.
Wall boundary conditions for scalar transport are handled analogously to
momentum, using the appropriate "law-of-the-wall''.