If you are modeling premixed combustion (see Modeling Premixed Combustion),
the fluid material in your domain should be assigned the properties of the unburnt mixture,
including the thermal diffusivity ( in Equation 8–77 in the
Theory Guide).
is defined as
, and values at standard conditions can be found in combustion handbooks (for
example, [83]). To determine values at non-standard conditions, you must
use a third-party 1D combustion program with detailed chemistry. You can set the
Unburnt Thermal Diffusivity in the Create/Edit Materials Dialog Box.