Converting resistance coefficients from STAR to Fluent for porous media

Some users got the STAR resistance coefficients of a porous media and they would like to apply them to Fluent. It is important to notice that the resistance coefficients are different in Fluent and in STAR. However, they can be converted.
Fluent viscous resistance coefficient = Beta_star / mu

Fluent inertia resistance coefficient = 2*Alpha_star/rho

where mu = fluid dynamic viscosity, and rho = fluid density

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