> On 25 Sep 2015, at 09:58, Torquil Macdonald Sørensen <[email protected]> > wrote: > > On 24/09/15 21:43, Véronique et Christophe Geuzaine wrote: >> >>> On 24 Sep 2015, at 15:52, Torquil Macdonald Sørensen <[email protected]> >>> wrote: >>> >>> Hi! >>> >>> I have a MSH file for a mesh of one quadrangle and four associated >>> scalar field node values. Looking at the GMSH visualization, it uses two >>> triangles to define the function shape inside the quadrangle, and it >>> seems to use P1 shape functions within each triangle. >>> >>> Is it possible to have GMSH not use any triangles for the visualization, >>> but instead assume that the scalar field should be represented with Q1 >>> shape functions inside the quadrangle? >>> >> >> Yes: select "Adapt visualization grid" in the options of the view. (Set the >> target error to a negative number to force subdivisions all the way to the >> maximum recursion level.) > > Thanks! This is much easier than for me to interpolate my FEM solutions onto > a finer mesh before visualization. It even looks as if the GMSH recursive > adaptation procedure converges towards something that looks like Q1 shape > functions... >
It does not just look like it; it converges to the exact shape function. This is actually a general procedure, that can be applied to any polynomial shape function (of any order). See http://geuz.org/gmsh/doc/preprints/gmsh_visu_preprint.pdf for a detailed explanation. > Best regards and thanks, > Torquil Macdonald Sørensen > -- Prof. Christophe Geuzaine University of Liege, Electrical Engineering and Computer Science http://www.montefiore.ulg.ac.be/~geuzaine Tetrahedron V, July 4-5 2016: http://tetrahedron.montefiore.ulg.ac.be Free software: http://gmsh.info | http://getdp.info | http://onelab.info _______________________________________________ gmsh mailing list [email protected] http://www.geuz.org/mailman/listinfo/gmsh
