Q-Morph: an unstructured quadrilateral mesh generator embedded in gmsh.
 

Hello everybody,

Some months ago, I have implemented the Q-Morph algorithm and included it in gmsh. I wrote the code very quickly. So it can further be improved/optimized, but hexaedral meshes (obtained by extrusion of quad mesh surfaces) provided by this code have already been used very succesfully for fluid-flow modelling, dispersion... with OpenFOAM and Code-Saturne.

I am currently implementing the H-Morph algorithm to get a fully unstructured automatic hexaedral mesh generator embedded in this very good and famous tool: gmsh. Work will be finished in few weeks.

The code I've written is under GPL, but I can't distribute the sources, because I did this work for a private company. However, I wanted to have public opinion about potential interests. Time is missing to do again the work for free, but I would be able to do all the work (Q-Morph + H-Morph) in about 3 months.

Here are links to videos showing some of the capabilities of this new gmsh module:

http://www.youtube.com/watch?v=8WLlrB6KS0Q
http://www.youtube.com/watch?v=gWFtsijR1v0
http://www.youtube.com/watch?v=nL3OwoTfK50
http://www.youtube.com/watch?v=BM7cNgA-A8g
http://www.youtube.com/watch?v=UrNLxpogIqk

Please, let me know your opinion/questions/suggestions...

Sincerely,
JB

I would love to see a function like this in gmsh. However, after March I probably won't have a need for this anymore. Maybe in the future.

I would love to find a job where I could spend all my time to develop this kind of numerical tools :)

Some news:
- now the Q-Morph module is able to mesh topo,
- H-Morph is almost finished.

See the pictures in my albums.

There is a small probability for the sources being freely available... but I don't know when... may be in years... it depends on my boss.

Very interesting!
 

Hi jbf,

I was very impressed by the videos (especially #3 and #4, and I appreciated that you were showing the limitations in #5) and think this feature would be very, very useful and appreciated by many gmsh users.

Personally, I'd also use this heavily. Currently, we have to pay a lot for a license of ANSYS (we're a small research centre, and even for those they cost a lot). The main reason is the quad/hexa meshing (the solver is actually pretty bad, so for high performance, we use external solvers).

This thread is about half a year old now, do you have any updates?

I'd pay you if I could, but have you considered kickstarter?
https://www.google.com/search?q=kickstarter

If you can do that as a project in 3 months, what would be the price? 12.000? I think that is doable. Gmsh has a large user base (also industrial users) and I can persuade my boss to pay the first 500 Euro.


excellent work.

Please let your boss know that this is a way to give back to the community. He saved a lot of money by using gmsh (or also other FOSS?), why not give something back? Anyways, please let me know (or pm me).

Hi Bashseb,

Yes I have. The implementation of the (improved) H-Morph algorithm gives better results than in the original publication of S. J. Owen (among others, I've got very much less remaining tetra in the mesh). Regrettably, I do not spend all my time to work about it. I'll update my albums soon...

Just give me a job ! I'll send you my CV in a private message as soon as possible.

Best regards,
JB

Hi JB and Sebastian,

Any update on Q Mesh in gmsh ? Considering the videos are down, I guess the product has gone commercial, which would be sad.... What is the status ??

Thanks