Rethought the design of this model. Still looking at diffusion through a fracture, but now I've edited the porosities of the middle row of nodes to be 1 to act as the fracture and removed the well sites for simplicity. I've also replaced kinetic minerals with simple minerals. However, now the model fails to converge at the same reaction progress, about 0.145. I have tried changing nearly each variable one at a time, but I still cannot find what is causing the model to stop at that point.
fracture size sensitivity analysis simple minerals.x2t