[Gmsh] Problem when meshing a very thin surface

[Christophe Geuzaine]

Ruth V. Sabariego wrote:
> Hi David,
> Could you send your geo file?
> Regards,
> Ruth

PS: not sure if the solution was posted to the list. Basically, if 
"element size * Mesh.RandomFactor" approaches machine accuracy, you 
should increase the value of Mesh.RandomFactor. On the command line, use 
e.g. "-rand 1.e-8".


> 
> CREVOISIER David wrote:
>>
>> Good afternoon,
>>
>>  
>>
>> First, congratulations for the development of Gmsh, this tool has a 
>> lot a great qualities.
>>
>>  
>>
>> I try to mesh several very thin surfaces, structured in a network of 
>> cracks. Two large surfaces are situated on both sides to this network 
>> and communicates with it. For large cracks, the mesh is correct (so I 
>> think the file .geo is well defined, I can send the source files if 
>> needed), but for thinner cracks (40e-6 m compared to a total domain of 
>> 10e-2 m for example), I am not able to use a characteristic length in 
>> the cracks smaller than their size, Gmsh sends “segmentation fault” 
>> due to 3 identical points in qtest and crashes. The options used for 
>> meshing surface are plane, MeshAdapt+Delaunay, a very low geometry 
>> tolerance is used and other options are standard. I know this case is 
>> complicated to mesh, but would advanced options or particular 
>> strategies be able to solve this problem?
>>
>>  
>>
>> Thank you for your time.
>>
>>  
>>
>> David Crevoisier.
>>
>> ------------------------------------------------------------------------
>>
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>>   
> 
> 
> -- 
> Dr. Ir. Ruth V. Sabariego
> University of Liege, Institut Montefiore,
> Dept. of Electrical Engineering & Computer Science, 
> Applied & Computational Electromagnetics (ACE),
> Sart Tilman Campus, Grande Traverse, 10 (B28), B-4000 LIEGE, Belgium
> phone: +32-4-3663737 -- fax: +32-4-3662910 -- http://elap.montefiore.ulg.ac.be/
> 
> 
> ------------------------------------------------------------------------
> 
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-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine