[Gmsh] Problem meshing 2 volumes

[Christophe Geuzaine]

jordi poblet wrote:
> Dear all,
> 
> I attach a file with an example where I am meshing two unlinked volumes 
> (no common points, lines or surfaces). If I mesh both of them when they 
> are largely separated (for example dlx = 0.5) I obtain correct meshes. 
> However, if I mesh them when are separated by small distance (dlx = 
> 0.01) the quality of the mesh in the first volume is very poor. The two 
> pictures of the surface 4 of the first volume are very different and I 
> would expect the same mesh or at least a mesh with the same quality 
> (mesh1.jpg, distance between volumes 0.5 and mesh2.jpg distance between 
> volumes 0.01). If I only mesh the first volume (even with small distance 
> dlx = 0.01), the mesh is correct.
> 
> I have not got this problem if I use netgen option (Mesh.Algorithm3D = 
> 4; ). I have found the same behaviour using a Linux version or a Windows 
> version of Gmsh. Moreover, the following message is written for the 
> cases of poor mesh quality:
> 
> .....
> 
> Info : 140/395: Face 291 311 340
> 
> Info : Intersections left (the face contains 0 initial faces, divided in 
> 5 points)
> 
> Info : The face is divided in 8 points (simplexes added=23, deleted=9)
> 
> Info : Recoverable face (9 <--> 9=2*(8-1)-5)
> 
> Info : 141/395: Face 297 311 340
> 
> ......
> 
> Does someone know the causes of this strange behaviour? What should I do?
> 


Use a more recent version of Gmsh (version 2): the new algorithm does 
not have this problem.





> Thanks in advance,
> 
> Jordi Poblet Puig
> 
> 
> 
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-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine