[GiDlist] 3D structured mesh with tetrahedron

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Daniel Marceau

[GiDlist] 3D structured mesh with tetrahedron

Postby Daniel Marceau » Thu Aug 02, 2007 11:17 pm

Hi,

I got a surprising results during meshing of a simple 3D rectangular plate
with tetrahedrons. The mesh is structured according to a uniform distribution
of elements along the three cartesian directions. If the option Normal is
specified as the Quadratic element option, I got 600 tetrahedrons and 1155
nodes. If I specify Quadratic, I got 2400 tetrahedron and 678 nodes.

This is totally different from the behaviour during meshing using hexahedron.
The same number of element is obtain for both Normal and Quadratic option.
Only the number of nodes is modified.

After some search in the preference menu, I switch off the option Symmetrical
structured tetrahedra in the mesh sub-menu. This change as fix the problem.

My question is:
- Why this option only applied to Normal interpolation and is inactive for
Quadratic and Quadratic9

A similar option (Symmetrical structured triangle) performs a good behaviour
on both Normal, Quadratic and Quadratic9 interpolation for triangle.

Thanks,
Daniel Marceau
User avatar
abelcs
Posts: 141
Joined: Mon Oct 13, 2014 9:14 am

[GiDlist] 3D structured mesh with tetrahedron

Postby abelcs » Fri Aug 03, 2007 9:00 am

Dear Daniel,

As you have said, the option Symmetrical Structured Tetrahedra doesn't work
yet using quadratic tetrahedra. This functionality is under development.

Regards,

ABEL

_____________________________________
Abel Coll Sans - Civil Engineer
CIMNE - International Center for Numerical Methods in Engineering
Ofice c-2, C1 building - Campus Nord UPC
Gran Capità s/n, 08034 Barcelona
T: 34 - 93 401 74 03 Fax: 34 - 93 401 65 17
abelcs at cimne.upc.edu
___________________________________________________

-----Mensaje original-----
De: gidlist-admin at gatxan.cimne.upc.edu
[mailto:gidlist-admin at gatxan.cimne.upc.edu] En nombre de Daniel Marceau
Enviado el: jueves, 02 de agosto de 2007 23:56
Para: gidlist at gatxan.cimne.upc.es
Asunto: [GiDlist] 3D structured mesh with tetrahedron

Hi,

I got a surprising results during meshing of a simple 3D rectangular plate
with tetrahedrons. The mesh is structured according to a uniform
distribution
of elements along the three cartesian directions. If the option Normal is
specified as the Quadratic element option, I got 600 tetrahedrons and 1155
nodes. If I specify Quadratic, I got 2400 tetrahedron and 678 nodes.

This is totally different from the behaviour during meshing using
hexahedron.
The same number of element is obtain for both Normal and Quadratic option.
Only the number of nodes is modified.

After some search in the preference menu, I switch off the option
Symmetrical
structured tetrahedra in the mesh sub-menu. This change as fix the problem.

My question is:
- Why this option only applied to Normal interpolation and is
inactive for
Quadratic and Quadratic9

A similar option (Symmetrical structured triangle) performs a good behaviour

on both Normal, Quadratic and Quadratic9 interpolation for triangle.

Thanks,
Daniel Marceau


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