2 PFV Drainage with Cracking

Dear all,

I am working with Yade for a while, but I am starting a new topic: Coupling DEM + Flow in unsaturated media.

From my overview it seems that PFV may do the work. But just before I start doing stuffs by my self, I wounder if someone have already worked with a similar problem and could indicate some material:

I want to simulate wetting and drying processes. The drying process is very similar to (1).

                i. For the wetting, would be possible to use the same idea, but set the pressure head for the wetting phase?
               ii. For drainage, as the non-wetting phase moves around the packing, would be possible to change particle size, cohesive strength, etc, in order to simulate shrinkage?

Cheers,
Luis

(1) https://gitlab.com/yade-dev/trunk/-/blob/master/examples/FluidCouplingPFV/drainage-2PFV-Yuan_and_Chareyre_2017.py