Ah true. So, Krzysztof, if you're using higher order polynomials then you might wish to output with the number of subdivisions in build_patches() <https://www.dealii.org/8.4.1/doxygen/deal.II/classDataOut.html#a5eb51872b8736849bb7e8d2007fae086> equal to the polynomial order. This will give a better (although still not exact) visualisation of the approximated solution field.
J-P On Thursday, January 12, 2017 at 9:43:46 PM UTC+1, Wolfgang Bangerth wrote: > > On 01/12/2017 06:45 AM, Jean-Paul Pelteret wrote: > > > > That said, it does seem a bit strange that the transfer of the solution > from a > > coarse to fine grid renders those two local maxima on the upper part of > the > > geometry. I don't think anything I've mentioned here could result in > this > > artefact. > > I could see that if the element used is quadratic or even higher order. In > that case, the *real* solution may have minima or maxima, but what we pass > to > Paraview is only a bilinear approximation, and what Paraview actually > displays > is a linear approximation on two triangles. > > Best > W. > > -- > ------------------------------------------------------------------------ > Wolfgang Bangerth email: bange...@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. For more options, visit https://groups.google.com/d/optout.
