> > [...] > This means everything we do in DataPostprocessor is evaluated directly in > the mapped Gauss points which is actually the reason why we use this > postprocessor approach. We want to map the solution of quantities stored on > the Gauss points to the physical nodes, so we can visualize them in a > proper way. > Actually, the solution vector stores the coefficients for the ansatz functions. Both FEValues and DataPostprocessor (using FEValues) evaluate the ansatz functions in given points and compute the values at the required points as a linear combination. Hence, there is no mapping from the Gauss points to the physical nodes involved. We simply evaluate at different points (Gauss quadrature points for the FEValues object you use and patch vertices in DataPostprocessor).
> I hope this is correct, because then I assume that both approaches are > correct and just differ by a simple mapping procedure. > Yes, both approaches are correct. Best, Daniel -- 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.
