[Gmsh] Breakdown due to memory problems : localfill h

[Christophe Geuzaine]

Hello Marcus - Indeed, there was small bug in our Netgen interface, 
which led to some weird size-dependency during Netgen's initial mesh 
generation.

This should be fixed in tomorrow's nightly snapshot. Can you give it a 
try and let us know?

PS : your transfinite volume seems to be wrong (volume/surface edges 
intersect). You might want to extrude the volume instead, as extrusions 
will enforce the matching automatically.




Marcus Drosson wrote:
> Hello,
> 
> a problem appears when I try to generate a 3D grid that combines 
> transfinite and unstructured volumes. Using the Netgen grid generator, 
> the memory size increases up to the breakdown of my computer (more than 
> 3GB). The 2D grid is constituted of only 15244 triangles. Tetgen is able 
> to generate a 3D grid but the interface between the transfinite and the 
> unstructured grid doesn't respect the continuity of the tetrahedrons 
> (huge arbitrary elements at one side and a structured grid at the other 
> side).
> 
> In order to verify that the problem doesn't come because I use different 
> types of grids, I put into comment everything except two rectangular 
> boxes (-> new.geo). Even for this very simple case, the grid generation 
> failed due to a memory problem. Using gmsh version 1.65, any problem 
> appears and the grid is generated in a few seconds. In the same way, 
> when I create a new .geo file to draw a box (with/without a hole), 
> everything works correctly. Thus the problem shouldn't be related to a 
> wrong configuration parameter of gmsh.
> 
> ".geo" -files and the gmsh output are attached.
> 
> Thanks!
> Marcus Drosson
> 
> 
> 
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-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine