Thank you for helping, Karthik.
The resistance is calculated from the trendline following the pressure curve, using the relationship C1 = 1440x, and that C1 = (mu/alpha)*delta_m. Due to linearity in pressure drop (according to the manufacturer), C2 is 0. Since the actual opening area is only half of the porous zone face area in Fluent, a conversion was made for the constant C1 (Fluent user guide eq. 7.2-11, link below), increasing C1 to 2880. It is then solced for 1/alpha as 1/alpha=2880/(mu*delta_m) = 4.75e11 m^(-2).
The model is fully converged. For BC, I have adiabatic walls, a total heat load in people an PC's of 480 W, operating temperature of 288K, inlet temperature 285K (want 3deg under temperature on inlet air), inlet velocity 0.4095 m/s.
Fluent ug: https://www.afs.enea.it/project/neptunius/docs/fluent/html/ug/node233.htm
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