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Hi all,

I need to built a new b.c (for the electric potential-phi) in order to couple a multi-region case. More specific the mathematical form of my b.c into the interface is Eb-Ea=0.
where Eb:electric field for solid and Ea for fluid region.
For this reason I am going to use the codedFixedValue b.c. Thus my question is:
How can I use the E variable in system/Changedictionary/phi file in order to code the above equation in phi b.c .?

Is the equation reader a solution .? if yes, how can I use it .?

thanks in advance !!