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.

Nerve model (Fitzhug-Nagumo) with Customized Differential Equation

Please login with a confirmed email address before reporting spam

I'm trying to implement Fitzhugh-Nagumo's Model (Propagating Wave) in Comsol. For that,
I need to define an electric potential with the equations:

du3/dS = c*u3 + u2 - f(u1)

du1/dS = u1

du2/dS = (e*(u1-g*u2))/c

where S = x + c*t

I want to feed the solution u3 as a boundary condition itself. The problem is that I'm not differetiating
respect to time t, but respect to S, that is a function both, of space and time. This seems to be imposible
using the standard Mathematics-Physics PDE tools; it has a bounch of PDE forms, but all of them use t as the
differentiating variable.

It would be perfect if I could find any way that enables me to define the equations just as they are written,
either in a customized fashion or find the appropiate option in the program.

Is there any way to implement this in COMSOL?

Thanks in advance,
Johann

0 Replies Last Post 2010年11月9日 GMT-5 12:57
COMSOL Moderator

Hello Johann Sonnenfeld

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.

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.