### Add term to RxD solution.

Posted:

**Fri Sep 07, 2018 5:43 pm**Hi everyone

I am working in RxD to find Na and k concentration inside axon, I know that RxD equation consists many terms:

\[\frac{\partial u}{\partial t} = d \nabla^2 u + f(u, t)\]

but I would like to add a new term to the right side, I know that the first term on the left side of the equation above " d \nabla^2 u" is one term of Nernst-Planck flux. I would like to add the other term of Nernst-Planck flux to the RxD equation. Can anyone help me please?

I am working in RxD to find Na and k concentration inside axon, I know that RxD equation consists many terms:

\[\frac{\partial u}{\partial t} = d \nabla^2 u + f(u, t)\]

but I would like to add a new term to the right side, I know that the first term on the left side of the equation above " d \nabla^2 u" is one term of Nernst-Planck flux. I would like to add the other term of Nernst-Planck flux to the RxD equation. Can anyone help me please?