Re: [Libmesh-users] building sphere using tetrahedral elements

[<ed...@op...>]

>> 
>> 
>> On Thu, Jan 16, 2020 at 1:21 AM Ramakrishnan Thirumalaisamy <
>> thi...@gm...> wrote:
>> 
>>> Dear libmesh users,
>>> 
>>> I want to create sphere with tetrahedral elements. I came across this
>>> function MeshTools::Generation::build_square. But this function 
>>> supports
>>> only HEX8/27 for 3D.  Is there any other functions in libmesh that I 
>>> could
>>> use to generate sphere with tetrahedral elements?
>>> 
>> 
>> Hi Ramakrishnan,
>> 
>> Your email mentions both spheres and build_square, but I'm assuming 
>> what
>> you're really after is spheres. The implementation doesn't currently 
>> exist,
>> but you could do something similar to what's currently done in the
>> build_cube() case when Tets are selected. That is, first a mesh of
>> hexahedra is created and then each hex is split into IIRC 24 tets. 
>> This
>> isn't the most economical splitting but it is very "symmetric" and
>> therefore easy to make the split elements line up consistently. This
>> splitting also introduces new mid-face nodes, which could be "snapped" 
>> to
>> the sphere surface as necessary.
>> 
>> Another option would be to configure/build libmesh with the
>> --disable-strict-lgpl option and then use the libmesh Tetgen 
>> interfaces to
>> create a Delaunay mesh of the sphere. If you end up implementing 
>> either of
>> those, it would be great if you could contribute them back as either
>> library code or possibly an augmented miscellaneous_ex6.
>> 
>> Note that libmesh also supports reading several different mesh file
>> formats, so if you generate a sphere mesh in e.g. Gmsh, you would be 
>> able
>> to read it in without doing any major programming yourself...
>> 
>> --
>> John
>> 
> 
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On 2020-01-16 17:33, Ramakrishnan Thirumalaisamy wrote:
> Thank you. Sorry for the typo. It should be build_sphere instead of
> build_square.
> 
> Yes. I already created sphere using gmsh and did my numerical 
> experiment.
> But i do not want to keep the mesh files in the remote repository. So I 
> was
> looking to circumvent this by creating sphere using libmesh.
> 
> If I could implement either of your suggestions, I will let you know.
> 
> On Thu, 16 Jan, 2020, 8:26 AM John Peterson, <jwp...@gm...> 
> wrote:
> 

Did you know that you can have a Gmsh script instead of a .msh (or 
another type of) file? (my 2 cents).

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