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 _______________________________________________ dealii mailing list http://poisson.dealii.org/mailman/listinfo/dealii
