The equation (9) in the tutorial is equivalent to the last two equations in the demo. But those have totally 3 typos:
1. the first term of the derivative is missing factor 2, 2. the second term should have (1+u_h)^2 (missing power), 3. the last equations should have minus. Jan On Sun, 3 Aug 2014 21:14:55 +0100 tong giang <[email protected]> wrote: > Dear all, > > i'm solving a problem with nonlinear poisson equation. But i have > found on the website 2 explanations about that equation, but this > both don't match with each other. Here a general nonlinear equation > was discussed: > http://fenicsproject.org/documentation/tutorial/nonlinear.html > > Using the equation Nr. 9 of the tutorial for the other specific > equation here: > http://fenicsproject.org/documentation/dolfin/dev/python/demo/documented/nonlinear-poisson/python/documentation.html > > > cozuld > > i could not come up to the derivative of F'(uh;δu,v). > > Could someone explain me, how can i fit the derivative from the > tutorial to the derivative from the specific equation of > nonlinear-poisson. I would be really happy with any explanation!! > > Best > To > _______________________________________________ fenics mailing list [email protected] http://fenicsproject.org/mailman/listinfo/fenics
