[GiDlist] Generating "structured" volumes and hexahedral mes

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Timo Hambürger

[GiDlist] Generating "structured" volumes and hexahedral mes

Postby Timo Hambürger » Wed Aug 10, 2005 8:38 am

Hi there,

i try to build an arbitrary shaped volume, and then to generate a hexahedron
mesh within. But if i build e.g. the gear from the tutorial, and then assign
hexahedron elements to the resulting volume, GiD throws an error when i try
to generate the hexahedron mesh as follows:
Non-Structured volumes can only be tetrahedra or only points.

How can i define the volume as a structured volume? Where is the difference
between structured and unstructured? I did not found anything about
structured volumes at the help-file.

Best regards from germany,
Timo Hambürger
User avatar
escolano
Posts: 1625
Joined: Thu Sep 18, 2014 3:31 pm

[GiDlist] Generating "structured" volumes and hexahedral mes

Postby escolano » Wed Aug 10, 2005 2:10 pm

Hi,
An structrured volume must have exactly 6 faces (topologically is like a
cube).
In order to generate the structured hexahedrals mesh, it's necessary to
manually edit the geometry to divide the volume in parts with 6-faces. Then
you assign the number of division in the three directions.

The last beta versions have a new feature: semi-structured meshes. It
generate triangular prisms. with unstructured triangle faces in two opposite
surfaces, and an structured number of divisions in the extrusion direction.

Regards

Enrique Escolano

----- Original Message -----
From: "Timo Hambürger" timo.hambuerger at flexilution.com
To: gidlist at gatxan.cimne.upc.es
Sent: Wednesday, August 10, 2005 9:31 AM
Subject: [GiDlist] Generating "structured" volumes and hexahedral meshes


Hi there,

i try to build an arbitrary shaped volume, and then to generate a
hexahedron
mesh within. But if i build e.g. the gear from the tutorial, and then
assign
hexahedron elements to the resulting volume, GiD throws an error when i
try
to generate the hexahedron mesh as follows:
Non-Structured volumes can only be tetrahedra or only points.

How can i define the volume as a structured volume? Where is the
difference
between structured and unstructured? I did not found anything about
structured volumes at the help-file.

Best regards from germany,
Timo Hambürger
_______________________________________________
GiDlist mailing list
GiDlist at gid.cimne.upc.es
http://gid.cimne.upc.es/mailman/listinfo/gidlist

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

[GiDlist] Generating "structured" volumes and hexahedral mes

Postby abelcs » Wed Aug 10, 2005 3:47 pm

Hello,

This mail is for add some extra information at the mail sent by Enrique to
the GiDlist in relation to the hexaedral meshes.
Using semistructured meshes it's another way to obtain hexahedral meshes.

As you will see, a volume can be meshed with semi-structured mesh if it's a
prismatic volume, where it can be distinguished to top surfaces (master and
slave), and the lateral ones. Lateral surfaces will be meshed with
structured mesh, and top ones can be meshed with any kind of mesh.
Depending on the element types assigned to the volume surfaces, result mesh
will have prism, tetrahedra or hexahedra elements.

The way of choosing the kind of mesh you want (since last beta versions) is
in "Mesh" menú, setting UNSTRUCTURED, STRUCTURED or SEMISTRUCTURED option,
and selecting the geometrical entities you want to mesh.

Regards

Abel Coll


----- Original Message -----
From: "Enrique Escolano" escolano at cimne.upc.edu
To: gidlist at gatxan.cimne.upc.edu
Sent: Wednesday, August 10, 2005 3:07 PM
Subject: Re: [GiDlist] Generating "structured" volumes and hexahedral meshes


Hi,
An structrured volume must have exactly 6 faces (topologically is like a
cube).
In order to generate the structured hexahedrals mesh, it's necessary to
manually edit the geometry to divide the volume in parts with 6-faces.
Then
you assign the number of division in the three directions.

The last beta versions have a new feature: semi-structured meshes. It
generate triangular prisms. with unstructured triangle faces in two
opposite
surfaces, and an structured number of divisions in the extrusion
direction.

Regards

Enrique Escolano

----- Original Message -----
From: "Timo Hambürger" timo.hambuerger at flexilution.com
To: gidlist at gatxan.cimne.upc.es
Sent: Wednesday, August 10, 2005 9:31 AM
Subject: [GiDlist] Generating "structured" volumes and hexahedral meshes


Hi there,

i try to build an arbitrary shaped volume, and then to generate a
hexahedron
mesh within. But if i build e.g. the gear from the tutorial, and then
assign
hexahedron elements to the resulting volume, GiD throws an error when i
try
to generate the hexahedron mesh as follows:
Non-Structured volumes can only be tetrahedra or only points.

How can i define the volume as a structured volume? Where is the
difference
between structured and unstructured? I did not found anything about
structured volumes at the help-file.

Best regards from germany,
Timo Hambürger
_______________________________________________
GiDlist mailing list
GiDlist at gid.cimne.upc.es
http://gid.cimne.upc.es/mailman/listinfo/gidlist


_______________________________________________
GiDlist mailing list
GiDlist at gid.cimne.upc.es
http://gid.cimne.upc.es/mailman/listinfo/gidlist


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