[Gmsh] Hex-Mesh problem

Martin.Raedel at dlr.de Martin.Raedel at dlr.de
Thu Mar 22 18:24:12 CET 2018


are there any new possibilities for this problem using the new OpenCascade-options? Or is there any option to specify the layers of an extrusion by surface meshes?


Von: gmsh [mailto:gmsh-bounces at ace20.montefiore.ulg.ac.be] Im Auftrag von Martin.Raedel at dlr.de
Gesendet: Mittwoch, 16. November 2016 16:30
An: gmsh at onelab.info
Betreff: Re: [Gmsh] Hex-Mesh problem

Hello again,

I got the desired result using an Extrusion:

[cid:image001.png at 01D24025.C201A120]

However, using Extrusion greatly disagrees with my modelling approach, since I create all required geometry (points, lines, surfaces, volumes) already in advance, before calling gmsh. Afterwards, I want to mesh the model with gmsh and  in a third step assign the created mesh to the existing geometry. Is there any way to create a (semi-)structured mesh using volumes already defined in my geo-file?

Best regards

Von: gmsh [mailto:gmsh-bounces at ace20.montefiore.ulg.ac.be] Im Auftrag von Martin.Raedel at dlr.de<mailto:Martin.Raedel at dlr.de>
Gesendet: Dienstag, 15. November 2016 17:23
An: gmsh at onelab.info<mailto:gmsh at onelab.info>
Betreff: [Gmsh] Hex-Mesh problem


I experience difficulties creating a pure or at least Hex-dominant mesh for the model in the text file. I tried a lot of solver options but even with the frontal algorithm and AllHexas subdivision algorithm I cannot get a proper mesh. Volume elements are only created for the left and right volume while the boundary surfaces of the middle volume are meshed but no volumes are created and different errors are thrown by gmsh, e.g.

"Cannot use frontal 3D algorithm with quadrangles on boundary" for frontal 3D

Is there any way that I am missing? Do I somehow have to mesh the middle volume first?

Best regards
Martin Rädel

Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)
German Aerospace Center
Institute of Composite Structures and Adaptive Systems | Structural Mechanics | Lilienthalplatz 7 | 38108 Braunschweig | Germany

Dipl.-Ing. Martin Rädel
Telephone +49 (0)531 295-2048 | Telefax +49 (0)531 295-2232 | martin.raedel at dlr.de<mailto:martin.raedel at dlr.de>

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