The porous media model incorporates an empirically determined flow resistance in a region of your model defined as "porous''. In essence, the porous media model is nothing more than an added momentum sink in the governing momentum equations. As such, the following modeling assumptions and limitations should be readily recognized:
Since the volume blockage that is physically present is not represented in the model, by default
FLUENT uses and reports a superficial velocity inside the porous medium, based on the volumetric flow rate, to ensure continuity of the velocity vectors across the porous medium interface. As a more accurate alternative, you can instruct
FLUENT to use the true (physical) velocity inside the porous medium. See Section
7.19.7 for details.
The effect of the porous medium on the turbulence field is only approximated. See Section
7.19.4 for details.
When applying the porous media model in a moving reference frame,
FLUENT will either apply the relative reference frame or the absolute reference frame when you enable the
Relative Velocity Resistance Formulation. This allows for the correct prediction of the source terms. For more information about porous media, see Sections
When specifying the specific heat capacity,
, for the selected material in the porous zone,
must be entered as a constant value.