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How to add a constraint in Comsol.

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Hi, all,
I am trying to simulate the electric field driven transport of two (inversely charged) species in the microchannel. I am using two independent Convection and Diffusion models to describe the concentration of the these two charged species (variable c and c2 respectively). How can I add a constraint such that c==c2 is guaranteed in the full domain?
Many thanks.
Z. R.

0 Replies Last Post Aug 26, 2010, 6:21 p.m. EDT
COMSOL Moderator

Hello Zirui Li

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