[Gmsh] Structured surface meshes and export to XYZ or structured CGNS

Christophe Geuzaine cgeuzaine at uliege.be
Tue Jan 21 14:24:16 CET 2020

Hi Guillaume,

Indeed Gmsh handles most (if not all) meshes as unstructured. Our new CGNS importer now handles structured meshes as input ; but the exporter still currently exports even structured meshes as unstructured. We plan to add simple structured CGNS grids for our transfinite meshes - but it's not done yet. Any help with this would actually be welcome.



> On 16 Jan 2020, at 10:59, Guillaume Florent <florentsailing at gmail.com> wrote:
> Hello,
> This is my first message on the mailing list, so please apologize any wandering off the Gmsh community culture ...
> I want to create a structured/block-structured (obviously quads) surface mesh and export it to either Plot3D XYZ format or to CGNS structured format to use it as an input for another hyperbolic mesher.
> Starting with a simple cube, I realized that:
> - I could not find an exporter to Plot3D XYZ format (I yet have to see if the P3D export format can be converted to XYZ)
> - even for a simple transfinite surface mesh on a cube face, I get an unstructured CGNS mesh when exported ('Unstructured' is in plain text in the exported file and the hyperbolic mesher complains about that since it expects a structured mesh).
> Am I missing something or hitting a Gmsh limit?
> Best regards,
> Guillaume Florent (Yacht Design + Engineering)
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Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 

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