This roughly works for diffusion
This roughly works for diffusion


Former-commit-id: 536fae6d1d87c6a77e2ac32ed958b5e2e46cb85c
Former-commit-id: a568919a9c273b8772520ca58d5d383b1d47609e
TomTranter/OpenPNM,amdouglas/OpenPNM,stadelmanma/OpenPNM,PMEAL/OpenPNM,amdouglas/OpenPNM