Hi,

i havethe two following problems:

(we add periodic boundary conditions to the two problems.

I have the following code FF++ to calculate the approximate solutions of two problems and compare the curves of solutionsreg.edp (3.3 KB)

The problem is that the derivative of solutions are note periodic. I don’t understand the reason. Please can any one check the FF++ code and tell me if there is an error?

Thank you in advance.