Thank you for the tip, I will have a look into the finite differencing then!. One last question: Do you know if using the second derivative vs finite differencing would make a difference if I just want to output the values as a pointwise quantity?
Best, Johanna On Friday, December 8, 2023 at 7:12:36 PM UTC+1 Wolfgang Bangerth wrote: > On 12/8/23 11:08, Johanna Meier wrote: > > Thank you for your quick response Dr. Bangerth! The context I would like > to > > use du/dt in does not have a test function. So I guess I have to stick > with > > the 2nd order elements or use the finite differencing in time (Thank you > for > > the suggestion! I have not thought about that). > > You lose one order of convergence with every derivative. You'll very > likely be > better off using the finite differencing than evaluating the right hand > side > of a second order PDE. > > Best > W. > > -- > ------------------------------------------------------------------------ > Wolfgang Bangerth email: bang...@colostate.edu > www: http://www.math.colostate.edu/~bangerth/ > > > -- 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. To view this discussion on the web visit https://groups.google.com/d/msgid/dealii/71a2609e-38e4-473a-88ce-bb0035eb030fn%40googlegroups.com.
