About Module of 'InvasionPercolation'

[likeduck]

Dear openpnm official,
I noticed that in the example on the official openpnm website, there is an example of predicting the relative permeability of porous media. But I found something worth thinking about (in the figure below).

The invasion percolation process is described as 'assuming a drainage process, the air(invading/non-wetting phase) will be invading the medium'. In other words, it is a process of that PNM is filled with water, and air drives the water. So how to make PNM full of oil, with water as a non-wetting phase to drive the oil? I did not find the code to change the original fluid in the PNM in the InvasionPercolation module. Could you please tell me whether this idea is feasible.
Sincerely.

[jgostick]

Yes, the IP algorithm just cares about "wetting phase" is defending and "non-wetting phase" is invading. There is no consideration of viscosity or gravity effects. These effects could be added, but they are complicated enough that we have never felt comfortable coding a general solution.

[likeduck]

I get it, anyway thanks for the work your group has done, I'll keep learning about InvasionPercolation.