[Gmsh] Question about Mesh Option for Tetrahedron Element Generation with GMSH

[Christophe Geuzaine]

On 01/09/10 09:38, 류은현 wrote:
> Thank you for your previous answer about zero jacobian.
>
> Now, I got another problem;;
>
> I made 2 *.geo files.
>
> file 1 : 3d_test_2.geo
>
> file 2 : takeda_model3_3d.geo
>
> First one can accept advanced mesh options "Optimize quality of
> tetrahedra", "Optimize quality of tetrahedra with Netgen"
>
> But second one generates error message that "run time error"
>
> You can know if you run the file 2.
>
> My question is, why this error message occurred? Although file 2 is
> somewhat complicated one compare with file 1, basic structure and order
> is same as file 1. So, I couldn't understand why this message was occurred.
>
> And second question is what is the difference between option "Optimize
> quality of tetrahedra" and option "Optimize quality of tetrahedra with
> Netgen"?


Indeed, the mesh generated by the 3D Delaunay leads to elements that are 
completely flat, which the optimizers cannot recover... We will keep 
your file in our bug database.

Two solutions until we fix the problem:

1) Use the Frontal 3D algo, which works fine on your example

2) Extrude your mesh (cf. the "Layer" command in Extrude)


>
> I attached both file 1 and file 2.
>
> Thank you for reading.
>
> Seoul National University, Korea
>
> Department of Nuclear Engineering
>
> RPL ( Reactor Physical Laboratory )
>
> Eun Hyun Ryu
>
>
>
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> gmsh at geuz.org
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-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine