Defining Momentum Source Co-efficient using UDF
 

Hi,
I've simulated the pressure drop in porous media using a UDF. The doubt which i am having is , in fluent the format of momentum source is

S = D*mu*Vj + C*0.5*rho*mod(v)*Vj

In UDF while defining source how will you define only viscous resistance(D) or only inertial resistance(C) as we are providing the source in general .

In need of some expert advice on thins issue

Regards

sudharshan