Dr. Wolfgang Bangerth, Thank you very much for your kind reply.
But, could I have one more question....? > > I don't know whether the problem really comes from that, but you can't > take > the second derivative of a finite element solution without problem. The > issue > is that it exists, of course, in the interior of elements. I just had a good idea for the calculation q without second derivative yesterday. But I need the surface integral of divergence of f(R,solution)*grad_solution where f is function of position and solution. <https://lh3.googleusercontent.com/-Uqi0P2vXSk4/WRkhVrIyr9I/AAAAAAAAACQ/XUyoOsrWSWoNyxhHo9xV2_64rKACA85qQCLcB/s1600/q_EQ.png> So my new question is , in deal.II, could I get local divergence of certain function to get surface integral? Thank you. Kyusik. > > > > -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to dealii+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
