[Gmsh] Newby: How long does it take ...

[Bernhard Stoevesandt]

Hi Christophe,

well, now i'm back at my original problem using gmsh. I'm trying to use
gmsh as an automatic mesh generator, since the mesh needs to be changing
. Generally this works, but at certain configurations (fx79tu.geo) i
still get the described error:
Warning : Volume has changed (0.832984->0.345215)
Warning : Volume has changed (0.680858->0.346659)
Warning : Volume has changed (0.173655->0.0638256)
Warning : Volume has changed (0.832984->0.345215)
Warning : Volume has changed (0.680858->0.346659)
Warning : Volume has changed (0.173655->0.0638256)
Warning : Volume has changed (0.0538652->0.0202929)
Warning : Volume has changed (0.0357815->0.0157767)
Warning : Volume has changed (2.4533->1.03161)
Warning : Volume has changed (1.31013->0.641532)
Warning : Volume has changed (2.29038->0.599493)
Warning : Volume has changed (0.0319762->0.00994697)
Warning : Volume has changed (0.0287389->0.0121019)
Warning : Volume has changed (0.0319762->0.00994697)
going on in a loop forever.
I started gmsh with gmsh $name"tu.geo" -2.
So i tried to use the gmsh $name"tu.geo" -2 -algo tri
version, but somehow the mesh isn't genereated at all (see fx79tu.gif),
although the message looks like it is being generated (see message.txt).
I'm using gmsh 1.60.1 on a SuSe Linux 9.2 .
So what now? Mostly in such cases i changed the geometry. But in cases
of an automatic generation, this doesn't help anymore.

Bernhard Stoevesandt


Christophe Geuzaine schrieb:
> Bernhard Stoevesandt wrote:
> 
>> hello,
>>
>> since i'm new to meshing and the program, i don't have any estimate how
>> long the meshing should take. now i started the program yesterday on this
>> 2D structur. i did start 2d meshing and the (pretty new and not so slow)
>> pc is running now for more than 16 hours. is that just the time it
>> takes -
>> or what's wrong. attachted is the input geo-file.
>>
> 
> Bernhard - strange: meshing your example on my Mac works just fine (it
> takes less than 1 second), but it fails on Windows with the default
> algorithm ("Isotropic").
> 
> I will look into it. In the meantime, use the "Triangle" algorithm (in
> Tools->Options->Mesh->General->2D algorithm). The resulting mesh will
> not be as nice, but it should work on Windows.
> 
> Take care,
> 
> Christophe
> 

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