Discussion Forum

Hi,

I have been trying to model the water electrolysis reaction on Pt electrodes and the mass transfer of the resulting H+ and OH- ions through water. I was using electric currents, transport of dilute species, and laminar flow with partial success. I just received a trial copy of 4.1 and I have been looking at the electrochemistry module included in it. I went through the "orange battery" tutorial and tried to apply it to my own geometry with some changes.

For one, I am just using two ends of my geometry as electrode-electrolyte boundary interface (the tutorial uses a domain interface), and although I am using the secondary current distribution physics, which is what was used in the tutorial, I will want to switch to the tertiary current distribution physics.

My problem is that when I try to solve the model, I get the error message " Feature: Variable sol1/v1. Error: Wrong number of dofs in linearization point." I have checked the model and compared with the instructions on the tutorial to see if there was anything I was not specifying or overspecifying, and I tried changing some values to see if they made any difference, but I always had the same result. I would greatly appreciate if anyone could finger the problem, but what I would really like is an explanation for this error message. I have been getting it a lot, and I don't know what causes it or how it should be addressed. What information does the "Feature" line in this error message give me? I think that is a good place to start troubleshooting, but I don't know what it really points to.

Thank you very much,
Aytug