> That's very insightful! I've double and triple checked the gradient of my > exact solution and I'm 99.9% sure it's correct. Additionally, the error > seems to go down in every norm which isn't the H^1 norm or H^1 seminorm.. > very strange.
If you can come up with a small example program demonstrating the problem, then we can take a look. I can easily imagine situations where the broken H1 norm does not converge but the L2 norm does. For example, if you use piecewise constants to solve the Laplace equation using a DG formulation, then you can't expect the broken H1 norm to converge (the gradient of the solution is zero on every cell). I don't know what your formulation is, however. Best W. ------------------------------------------------------------------------- Wolfgang Bangerth email: [email protected] www: http://www.math.tamu.edu/~bangerth/ _______________________________________________ dealii mailing list http://poisson.dealii.org/mailman/listinfo/dealii
