Surface elements node numbering issue

[Rolando]

Dear all

I need a mesh consisting of triangular quadratic surface elements to be exported from GiD into DiANA, via *.txt file. However, it seems that node numbering from GiD and DiANA are quite different. In the attached I show the required node numbering in DiANA (counterclockwise, sequentially numbered nodes; with corner nodes #1, #3 and #5; mid-nodes #2, #4 and #6). I noticed that GiD is also counterclockwise but corner nodes are #1, #2 and #3.

Is this correct? and if so, is there any chance to re-order the node numbering in GiD prior to meshing?

Thanks in advance,

[escolano]

The quadratic connectivities of GiD is as you said hierarchical, first linear nodes of corners, and after the quadratic nodes.
Each program and format has its own order, there is not any standard.
But you can export the mesh and other data in the format you want,

• writing a simple .bas template, in a trivial case like this (write the mesh with a different element order of connectivities)

Have a loop to the files of <GiD>/templates
e.g.<GiD>\templates\NastranMesh.bas require write elements with other order that the GiD internal

• or writing a full problemtype to handle the conditions, materials, and also a specific file format (with Tcl procedures)