Hi Tobias! Thanks very much for your help. Turns out my problems came from a combination of a bug in the boundary conditions (that I modified from the original version of step-12), and the fact that I was defining the order of convergence based on the DoFs instead of the mesh size. Now everything looks okay. Thanks a lot for your help!
Have a good week :) -- Mihai ________________________________ Von: Tobias Leicht <[email protected]> An: [email protected] CC: [email protected]; mihai alexe <[email protected]> Gesendet: Dienstag, den 7. September 2010, 3:43:31 Uhr Betreff: Re: [deal.II] order of convergence for DG solver Hi Mihai, one other though, just to be sure: Order of convergence is defined with respect to mesh size, not number of unknowns or number of mesh elements. To get a factor of 2 in the mesh size we have to increase the number of elements and thus unknowns by a factor of 4 in 2D and a factor of 8 in 3D. If you compute something similar to the order of convergence with respect to the number of unknowns you have to multiply the result with the dimension to obtain the actual order of convergence. For your values of 1 and 1.5 this would yield the 2 and 3 that I have seen. Maybe there is no bug after all... Best, Tobias
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