Found the culprit :-) but it does not solve my problem :-(
If either "Mesh --> set Order 2" or "Mesh -> Hight order tools" is used on a hexahedron8 it does not make a hexahedron20 but a hexahedron27 instead. Means a node is not only made on any edge center point but on any face center point too.
Neither unv nor inp export of GMSH support hexahedron27. A hexahedron20 can be exported to unv and inp and these files are fine.
This means back to the first question. Is it possible to make a hexahedron20 element out of an hexahedron8 in gmsh?
kind regards bernd attached a hexa20.unv and hexa8.unv to test with. Zitat von Bernd Hahnebach <g...@b75.ch>:
More informations in this regard ... - open file b5__hexa8_coarse.msh - in GMSH Tree click on Mesh --> Set order 2 - Menue Tools --> Options --> Mesh --> Visibility --> activate Nodes - It seams we have got a second order mesh ?!- Menue Tools --> Visibility --> Numeric --> click on hide elements (put in * before) --> click on show elements (put in 50 before)- screen is attached --> it really seams to be a hexa20 mesh - save as msh --> reload --> still a hexa20 mesh - save as unv --> reload --> no hexa20 mesh, it is a hexa8 meshCould it be hexa20 ist not supported in GMSH unv export ?? Could someone else give more informations in this regard?GMSH 2.12.0 kind regards bernd Zitat von Bernd Hahnebach <g...@b75.ch>:Dear gmsh folks,attache a coarse hexa first order mesh. I'd like to get an second orde hexa mesh out of this. I found the hight order tools can be used to create the appropriate nodes for a second order hexa mesh. But how do I create elements out of the nodes.kind regards bernd
hexa8.unv
Description: Binary data
hexa20.unv
Description: Binary data
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