[Thangam]

I want to specify the value of blockage/porosity that changes over time. A simple example would something that has no blockage at the beginning but progressively has more blockage. Reading a tableFile or just scalar values i.e (time, D) within fvOptions/fvModels is what I'm looking for. How do I go about it?

From the tutorials: incompressible/pisoFoam/laminar/porousBlockage/constant/fvModels

porosity
{
    type            explicitPorositySource;

    explicitPorositySourceCoeffs
    {
        selectionMode   cellZone;
        cellZone        porousBlockage;
        
        type            DarcyForchheimer;
        
        D 100;  // This value needs to be non-uniform/time-varying.
    
        d   ($D $D $D);
  
         f   (0 0 0);
        
        coordinateSystem porousBlockage;
    }
}