> On 30 Mar 2016, at 07:30, Bernd Hahnebach <g...@b75.ch> wrote: > > Thanks Christophe! > > I got the problem of the high order meshes by reading a big part of the > paper. :-) :-) Is there any user documentation or an example how to use the > HighOrderTools around? > > Just to get it the right way done. How does it work in the gui? >
1) Load the geometry 2) Mesh (e.g. press "3" to do a 3D mesh) 3) Open "High order tools" - Choose the polynomial order and press "Generate" (this will create high order elements) - Press "Regularize" (this will optimize the high order elements) > - Load the geometry (in my case a BRep) > - make the adjustments on Tools --> Options --> Geometry and Mesh --> one of > them is 2nd order mesh > - In GMSH Tree press Mesh 1D, 2D, 3D > - on 3D I get negative Jacobians if the mesh order in options is set to two > - do not use any optimization, do not use the order buttons (mesh is 2nd > order already) > - open HighOrderTools > - Generate 2nd order vertices > - Regularize with given values > > - Or do I have to start with a 1st order mesh and use Generate 2nd order > vertices on a 1st order mesh? > - Should any of the optimizations be done before the HighOrderTools? > > kind regards bernd > > > Zitat von Christophe Geuzaine <cgeuza...@ulg.ac.be>: > >> >>> On 24 Mar 2016, at 19:06, Christophe Geuzaine <cgeuza...@ulg.ac.be> wrote: >>> >>>> >>>> On 24 Mar 2016, at 12:27, Bernd Hahnebach <g...@b75.ch> wrote: >>>> >>>> >>>> What is the recommended way to avoid such negative jacobians? Attached the >>>> geometry of the mesh above. >>>> >> >> And to avoid such negative jacobians, you can use the "High order tools" (in >> the Mesh menu). This is still experimental, but works quite well. The >> algorithms are described (in part) in >> >> T. Toulorge, C. Geuzaine, J.-F. Remacle, J. Lambrechts. Robust untangling of >> curvilinear meshes. Journal of Computational Physics 254, pp. 8-26, 2013. >> http://gmsh.info/doc/preprints/gmsh_untangling_preprint.pdf >> >> Christophe >> >> >> -- >> 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 > gmsh@onelab.info > http://onelab.info/mailman/listinfo/gmsh -- 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 gmsh@onelab.info http://onelab.info/mailman/listinfo/gmsh
