Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.
Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
Adding an extra variable
Posted Apr 25, 2012, 5:12 a.m. EDT Chemical Reaction Engineering, Parameters, Variables, & Functions Version 4.2a 0 Replies
Please login with a confirmed email address before reporting spam
I'm considering a diffusion problem, where I have several species in a solution and couple of electrodes. Additionaly to the field variables c1,c2... (i.e. concentrations of different species) I would like to add an extra variable Ep(t) - the potential of one of the electrodes which is defined by a certain constraint. This constraint actually signifies a constant value of the sum of fluxes of all species over the whole electrode. The important point is that the Ep is not explicitly encountered in this constraint, but only implicitly through the boundary condition which couples fluxes and potential.
How can I do this with Comsol?
I've tried to add a 'Global Constraint', but since Ep(t) is not explicitly encountered in the condition I can't understand how to link it with the boundary condition.
Thank you in advance.
Hello Oleksandr Oliynyk
Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.
If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.