in Fluent we have the superficial and physical velocity formulation. Within the superficial velocity formulation the porosity is indirectly accounted for due to your input of inertial and viscous losses but the volume is still 100% open. This lead to a conservation of the superficial velocity or volumetric flux (no jump in the velocity). With the physical velocity formulation the porosity will enter into your momentum conservation. This is more accurate but might suffer from stability issues. The User's Guide in Fluent does cover both formulation with a lot of details.
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