Define Models Species...
FLUENT warns you, during the partially premixed properties calculation, that any parameters are out of the range for the laminar flame speed function, you will need to modify the piecewise-linear points manually before saving the PDF file. See Section
17.3.2 for details. Also, the calculation of the thermal diffusivity uses the thermal conductivity in the
Materials panel. More accurate thermal diffusivity polynomials can be obtained by editing the thermal conductivity in the
Materials panel and then clicking
Recalculate Properties in the
FLUENT will automatically select the prepdf-polynomial function for Laminar Flame Speed, indicating that the piecewise-linear polynomial function from the PDF look-up table will be used to compute the laminar flame speed. You may also choose to use a user-defined function instead of a piecewise-linear polynomial function. See Section 16.3.4 for information about setting the other properties for the unburnt material.
Define Boundary Conditions...
See Section 15.13 for guidelines on setting mixture fraction and variance conditions, as well as thermal and velocity conditions at inlets.
| There are two ways to specify a premixed inlet boundary condition:
For example, if the premixed inlet of methane and air is at an equivalence ratio of 0.3, you can
Method (a) is preferred since it will have more points in the flame zone than method (b).
Solve Initialize Patch...
See Section 16.3.6 for details.
See Section 15.16.4 for guidelines about setting solution parameters. (These guidelines are for non-premixed combustion calculations, but they are relevant for partially premixed as well.)