porous medium - defining loss coeff for two fluids
 

hello all

i have a porous pad that seperates two fluids(air and water). the pad is placed horizontally and above the pad is water and below the pad is air. so this is modelled as transient multiphase problem with porous subdomain. To model the porosity, i use linear and quadratic coefficients. I have the behaviour of water and air for the porus medium (the pressure drop vs velocity curve).

Here i got a question on how to give seperate (linear and quadratic) coefficients for air and water. That is, air will have linear, quadratic coefficients and water will have different linear, quadratic coefficients. how to define these for the porous media?

thanks in advance sudhakar