Element type Hexahedra

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JAP
Posts: 3
Joined: Mon Jun 10, 2019 6:03 am

Element type Hexahedra

Postby JAP » Mon Jun 10, 2019 6:07 am

hello: when I do mesh ¿why the next inf window in a example with shell load?

"Condition 'Global_Shell_Load' has flag 'on body elements' and maybe it needs flag 'on face elements' in the .cnd file in the problem type
(or maybe the entity must be forced to be meshed by the global variable ForceMeshEntities or with explict Mesh criteria->Mesh)

Error when transfering condition 'Global_Shell_Load' from geometry to mesh in surface 4. It has not been transferred"

The example is a beam with shell load.

when I work with point-load in the beam, GID run nice.

I work with element type Hexahedra and structured-volumes-assign size.

Thanks.
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escolano
Posts: 1562
Joined: Thu Sep 18, 2014 3:31 pm

Re: Element type Hexahedra

Postby escolano » Wed Jun 12, 2019 1:43 pm

These conditions depends on the problemtype, not on GiD.
(you have not specified what problemtype you are using)

The warning message
"Condition 'Global_Shell_Load' has flag 'on body elements' and maybe it needs flag 'on face elements'

mean that probably the condition was designed to be applied to surface elements (triangles or quadrilaterals), not to faces of volume elements (like hexahedra).
JAP
Posts: 3
Joined: Mon Jun 10, 2019 6:03 am

Re: Element type Hexahedra

Postby JAP » Wed Jun 12, 2019 2:33 pm

Hello Escolano: thanks for response.

if, this is a problem type in safir structural 3d.
The example is a beam of section quadre with shell load. The material is in teh body. However, when I work with point-load in the beam, GID run nice.
The developers of safir say:

"Safir only has Hexahedral elements implemented as SOLID elements and therefore, in the Safir_Thermal_3D and Safir_Structural_3D Problem Types, you should make sure the mesh in volumes is created using this type of elements"

¿How can I generate the inf window of GID?

Inf window:
"Condition 'Global_Shell_Load' has flag 'on body elements' and maybe it needs flag 'on face elements' in the .cnd file in the problem type
(or maybe the entity must be forced to be meshed by the global variable ForceMeshEntities or with explict Mesh criteria->Mesh)

Error when transfering condition 'Global_Shell_Load' from geometry to mesh in surface 4. It has not been transferred"

help me.

Thanks.
User avatar
escolano
Posts: 1562
Joined: Thu Sep 18, 2014 3:31 pm

Re: Element type Hexahedra

Postby escolano » Wed Jun 12, 2019 5:30 pm

I don't know the input requirements of SAFIR structural 3D.

Maybe the volume mesh of hexahedra is not enough and it also require the boundary mesh of quadrilaterals, where the condition 'Global_Shell_Load' is attached.
Then if the quadrilaterals are also generated the condition is applied to them, not to faces of hexahedra, and the GiD message won't appear.

To try set the surfaces to be explicitly meshed:
Mesh->Mesh criteria->Mesh->Surfaces
and select all (or maybe only the ones with the condition, I don't know)
then generate again the mesh and calculate

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