[Gmsh] Avoid mixed tetrahedra and triangles in volume mesh

[Christophe Geuzaine]

Zenker, Dr. Matthias wrote:
> I have several (physical) volumes with physical surfaces in between, and
> I need them to define boundary conditions. Can this be the cause of the
> problem? And is there a "trick" to avoid it?
> 

Well, if you define Physical Surfaces and Physical Volumes you will 
indeed have both triangles and tetrahedra in the mesh---that's the 
purpose of the "Physical" definitions...



> Best regards,
> 
> Matthias
> 
>> -----Original Message-----
>> From: gmsh-bounces at geuz.org [mailto:gmsh-bounces at geuz.org] On 
>> Behalf Of Christophe Geuzaine
>> Sent: Friday, November 14, 2008 7:22 PM
>> To: Zenker, Dr. Matthias
>> Cc: gmsh at geuz.org
>> Subject: Re: [Gmsh] Avoid mixed tetrahedra and triangles in 
>> volume mesh
>>
>> Zenker, Dr. Matthias wrote:
>>> Hi,
>>>
>>> I have some problems using meshed some 3D geometries 
>> generated by gmsh 
>>> in the Elmer FEM software (_www.csc.fi/elmer_ 
>>> <file://www.csc.fi/elmer>). I have been told by one of the Elmer 
>>> developpers that the problem is that there were mixed 
>> tetrahedra and 
>>> triangles in my volume mesh, and that there should be a way 
>> to avoid this.
>>> Question: Is there such a way in gmsh? I already tried 
>> "Optimize" and 
>>> "Optimize (Netgen)", but with no apparent effect.
>> Maybe you have internal geometrical surfaces? If you only 
>> want to save volume elements, define a/several "Physical Volumes".
>>
>>> Thank you for a hint,
>>>
>>> Matthias
>>>
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>> --
>> Prof. Christophe Geuzaine
>> University of Liege, Electrical Engineering and Computer 
>> Science http://www.montefiore.ulg.ac.be/~geuzaine
>>
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> 
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-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine