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Isotropic sphere mesh in salome

  • Jan Olten
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15 years 2 months ago #2842 by Jan Olten
Isotropic sphere mesh in salome was created by Jan Olten
Hi, can I avoid getting extremely bad aspect ratios of the triangles near the poles of a sphere, which I obtain by automatic tetrahedralization (see attached figure)?

The problem is probably the parameterization of the sphere "edges" which are singular at the poles. My idea is to cut the pole caps. The remaining body can be mapped to a cylinder, which is easily meshed. The pole caps can be mapped to circular faces, which are no problem either. But I don't know how mapped meshing algorithms are used, and how to make the meshes on both sides of the cut planes consistent.

Can I find somewhere a description of these steps or other methods to build an isotropic mesh of the sphere with Salome?

Regards
Jan
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15 years 2 months ago #2848 by Joël Cugnoni
Replied by Joël Cugnoni on topic Re:Isotropic sphere mesh in salome
Hi,

This is a common problem with the Mefisto 2D Triangle mesher. Try to use Netgen 1D-2D or even Netgen 1D-2D-3D instead !!

Joël Cugnoni - a.k.a admin
www.caelinux.com
  • Jan Olten
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15 years 2 months ago #2852 by Jan Olten
Replied by Jan Olten on topic Re:Isotropic sphere mesh in salome
Thank you very much! The Netgen 1D-2D result looks much better.

However, most triangle on one hemisphere are significantly larger (by a factor of 2-3) than on the other hemisphere. Is this another common problem, or can I balance the element areas somehow (optimization is already on)?

Jan
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