Boundary condition for concentration
 

Hello everyone,

I would like to ask how to implement boundary condition for concentration field C1.

Boundary condition should look like this:

D11*(∂C1/∂x) + D12*(∂C2/∂x) + DT1*(∂T/∂x) = 0

I read about groovyBC but I am not sure if its suitable for this problem.

Thanks in advance,
Berin