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#1 2016-08-05 10:39:52

arturozg59
Member
From: Colombia
Registered: 2016-07-02
Posts: 1

Overlapping or the mesh cannot be reoriented

Hi, I'm doing my master degree project and have a problem with Code Aster.

My project use an steel tube column with a base making contact over a short concret column. The steel column tube was fixed in some points to the concret column. I use a wahers to guarantee  that the surface of the bolts area was greather than contac surface with washer surface.
I have two contact surfaces: Steel base plate with concrete, and base plate washers with bolts.

I had an error when I used a geometric compound instruction.
error: invalid input mesh. ngexception at volume meshing: stop meshing since boundary mesh is overlapping code aster

I read in another forums to change tetrahedro size. I try some values for Minimum number segments, min. size and max. size , and the result was the same.

Then I try to solve the problem in another way. I do a mesh compound but when i use the wizard to make a test with elastic mode, i have two errors:

1- Cannot assign geometry groups because the option was disabled
2- I use two mesh groups and at the end i get an error:

La maille de peau : M47536 ne peut pas être réorientée.
Car elle est insérée entre 2 mailles "support" placées de part et d'autre : M232211 et M243515.
Conseils :
Vous pouvez utiliser les mots-clés GROUP_MA_VOL en 3D et GROUP_MA_SURF en 2D pour choisir une des
deux mailles supports et ainsi choisir la normale permettant la réorientation.

Can you help me. I was attached my python code for salome meca


Attachments:
2 Models.rar, Size: 12.28 KiB, Downloads: 101

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#2 2019-01-08 12:23:11

nirmaljoshi
Member
From: Japan
Registered: 2018-10-12
Posts: 122

Re: Overlapping or the mesh cannot be reoriented

I had similar error. Has anybody solved it?

"Invalid input mesh. NgException at Volume meshing: Stop meshing since boundary mesh is overlapping
Intersecting triangles"


Attachments:
img.png, Size: 41.84 KiB, Downloads: 38

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#3 2019-01-08 12:33:23

faustzyx
Member
From: China
Registered: 2018-11-01
Posts: 8

Re: Overlapping or the mesh cannot be reoriented

hi people,
try  to use Partition function in Geometry before Mesh.

Yi

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#4 2019-01-08 12:36:48

nirmaljoshi
Member
From: Japan
Registered: 2018-10-12
Posts: 122

Re: Overlapping or the mesh cannot be reoriented

It worked!! Thanks..
Could you please explain why it worked??


faustzyx wrote:

hi people,
try  to use Partition function in Geometry before Mesh.

Yi

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#5 2019-01-08 13:23:36

faustzyx
Member
From: China
Registered: 2018-11-01
Posts: 8

Re: Overlapping or the mesh cannot be reoriented

hi nirmaljoshi,
this will help u

The partition operation will also connect the solids but it will keep a face at the frontier (in brown in the picture below). The resulting shape will consist of two connected solids that share a face at their frontier. It means that this face is present only one time in the resulting shape and is a sub-shape of both the box and the cylinder.


This operation allows you to identify different areas in a shape (e.g. different materials) and to ensure a conformal mesh when meshing it later. Indeed the face at the frontier is meshed only once.
from docs.salome-platform.org/latest/gui/GEOM/partition_explanation.html

Last edited by faustzyx (2019-01-08 13:23:49)

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#6 2019-01-10 11:20:53

nirmaljoshi
Member
From: Japan
Registered: 2018-10-12
Posts: 122

Re: Overlapping or the mesh cannot be reoriented

Thanks! It was very useful.

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