Re: [Gmsh] Hex-Mesh problem

Christophe Geuzaine Sun, 25 Mar 2018 00:14:46 -0700

Hi Martin,

General (high-quality) full-hex meshes are not available: it's a current research topic. For high-quality full-hex meshes without extrusion, your best bet is to generate a fully structured grid - see attached file. Otherwise you'll have to either accept a hex-dominant mesh (we are actively working on this) ; or a low-quality hex mesh (using the subdivision algorithms).

Christophe

geometry_minimal_3D_structured.geo
Description: Binary data

On 22 Mar 2018, at 18:24, [email protected] wrote:

Hello,

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?

Regards
Martin

Von: gmsh [mailto:[email protected]] Im Auftrag von [email protected]
Gesendet: Mittwoch, 16. November 2016 16:30
An: [email protected]
Betreff: Re: [Gmsh] Hex-Mesh problem

Hello again,

I got the desired result using an Extrusion:

<image001.png>

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
Martin

Von: gmsh [mailto:[email protected]] Im Auftrag von [email protected]
Gesendet: Dienstag, 15. November 2016 17:23
An: [email protected]
Betreff: [Gmsh] Hex-Mesh problem

Hello,

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 | [email protected]
www.DLR.de

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Re: [Gmsh] Hex-Mesh problem

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