How can i approximate Darcy coefficient and Forchheimer coefficient?

Hi, I'm wooseok.

I'm doing some Flow analysis which included Porous media layers.(urethane foam and the leather with fine holes)

and i found Acusolve follows some formulas.

but i found i need to approximate some properties. (Darcy coefficient, Forchheimer coefficient)

I've found other ways to approximate internet information but I'm not sure if they're the right formula for our acusolve..

i think i can do Flow analysis for getting pressure drop about the leather.

and can i help for next steps? ><