You are showing the global numeration of the nodes, not the element list of connectivities!!
This global numeration is only like an identifier name of each node.
e.g. the node number 1 can't be the first node of each element!!
To know the nodes of an element you can list it (utilities-list-Element). First are listed corners, then middle nodes.
Regards
Enrique
----- Original Message -----
From: vijayendra.munikoti at power.alstom.com
To: gidlist at gatxan.cimne.upc.es
Sent: Wednesday, April 04, 2007 4:22 PM
Subject: [GiDlist] (no subject)
Hi
I am trying to generate quadratic hexahedral mesh in a simple cube. I am not able to understand the numbering sequence of the nodes. Should it not be like what is described in the documentation viz. all corners first and then the middle points ?
I have enclosed the screen print of the cube as jpg file. To understand, I have generated one element.
Can anyone help me?
Thanks
Munikoti
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[GiDlist] Two layers, same mesh in plane XY, different divis
Moderator: GiD Team
[GiDlist] Two layers, same mesh in plane XY, different divis
Hi,
I didn't collapse the model. I just created the middle surface in the XY
plane, and just used it to do two extrusions (utility-copy) on either side
on this surface (the checkbox with the label 'duplicate entities' should be
unchecked). The options I used in this window are:
Entities type: Surface,
Transformation: rotation (to get the model I sent you before, perhaps in
your case should be translation),
First point..angle..second point... whatever
EmptyCheckBox - duplicate entities
Do extrude: volume
EmptyCheckBox - create contacts
(...)
In your case, where one of the volumes is already created, you should use
what you call the 'master surface' as a face of the second volume. I don't
know how do you create this second volume, but in the 'Utilities--Copy...'
window you can select this 'master surface' to do the extrusion of the
second volume.
Once the second volume is created, you can select
'Mesh--SemiStructured--Volumes' menu option. Enter the number of divisions
you want for the second volume, and click on the second volume, then press
'Escape'.
Now select 'Mesh--SemiStructured--Set--Master Surface' and click on your
'master surface'.
Now you can create your mesh.
If you don't want to remesh the first volume, just 'freeze' the layer where
the volume is: in the layer window, click on the layer and press the button
with the closed padlock icon. When a layer is frozen, it can not be edited
nor meshed.
Miguel
-----Mensaje original-----
De: gidlist-admin at gatxan.cimne.upc.edu
[mailto:gidlist-admin at gatxan.cimne.upc.edu] En nombre de Isabel Gil
Enviado el: martes, 03 de abril de 2007 17:22
Para: gidlist at gatxan.cimne.upc.edu
Asunto: Re: [GiDlist] Two layers, same mesh in plane XY, different division
in X axis.
Thank-you very much. Your plots have helped a lot.
Yes, more or less it is your problem which I was asking about.
Other questions that have sprung up are the following ones:
- Do you collapse the model? I mean, do use
"Geometry-edit-collapse-model" (or "Geometry-edit-collapse-surfaces" or
"Geometry-edit-collapse-volume") before using semistructured mesh? If
you do, which one, among these three possibilities, do you use?
- I have the same problem as you have but, in my case, the geometry that
lies on the layer (number 1) is already meshed (and although I speak of
cube, the geometry I actually use is more complicated). Then, I create
the second cube on another layer (number 2) but I would like to have the
same mesh on the master surface as you have. The only difference is that
the mesh over one cube is created previously.
Perhaps, the only solution is to create all mesh together from scratch
every time I add a new piece of my geometry. However, I have to create
and simulate my mesh little by little and if I have to create the
entirely mesh every time, it is really hard stuff, isn't it?
I don't know if I have explain myself correctly.
Again, thanks very much. I am looking forward to hearing from you.
Best regards
Isa
Miguel Pasenau wrote:
Hello,
Let's see if i've understood you:
¿you want something like the pictures I send you enclosed:
'Semistructured2cubes.png' and 'Semistructured2cubes2.png'?
To achieve this I've followed these steps:
Creation of the geometry: a square in the xy plane, and then an extrusion
with rotation of 60 degrees on the positive (in one layer) and negative Z
axis (in the other layer).
Semistructured mesh:
1. I choose 'Mesh--semistructured--Volumes' and a windows pop's up
asking
me 'Enter number of divisions and assign it to the semi-structured
volumes'.
2. I entered '4' and clicked on one volume,
3. then I entered '10' and clicked on the other volume.
4. then I pressed 'escape'.
5. now I chose 'Mesh--semistructured--Set--Master surface'
6. and selected the square which lies on the XY plane, because the mesh of
this 'master surface' will be the one to be extruded along the volumes,
i.e., the z axis.
7. and generated the mesh (Ctrl-G): 1260 Prisms.
I send you enclosed the model, too.
If this is not want you need, ¿can you send us an example?
Miguel
-----Mensaje original-----
De: gidlist-admin at gatxan.cimne.upc.edu
[mailto:gidlist-admin at gatxan.cimne.upc.edu] En nombre de Isabel Gil
Enviado el: martes, 03 de abril de 2007 13:35
Para: gidlist at gatxan.cimne.upc.edu
Asunto: Re: [GiDlist] Two layers, same mesh in plane XY, different
division
in X axis.
Sorry for my explanation.
I will try to clarify my doubts.
I have two volumes (indeed two cubes) in different layers that share one
surface.
Volume1 is already meshed and I would like to extrude its mesh made in
the sharing surface (XY-plane) into the opposite face of the Volume2.
On the other hand, I can have different divisions on the structured
direction in each volume, which is a feature that I need.
I have tried to use "Geometry-Create-Contact-Separated volume", as you
said (without using Geometry-Collapse-Model) but the message I obtain is
"2 surfaces are necessary".
Thanks in advance and best regards
Isa
Enrique Escolano wrote:
I don't understand well your questions.
Do you have two volumes in two different places, or they have some
surface
in the same location? Then they share this surface?
If a surface is shared between two volumes, then its nodes are also
shared. Maybe you need to collapse both surfaces.
If they are two separated surfaces, in general unstructured meshes
obtained can be different.
You can force the number of divisions in lines with
Mesh-Structured-Lines
If you really need to have the "same mesh" (a one-by-one relationship
between nodes), you can do a trick: create a "separated
contact volume" between this two surfaces
(Geometry-Create-Contact-Separated volume).
By default this pseudo-volume will create prisms connecting nodes, but
you
can avoid to create elemens for this volume with
Mesh-Mesh criteria-No mesh-Volumes
Regards
Enrique
----- Original Message -----
From: "Isabel Gil" misabel at litec.csic.es
To: gidlist at gatxan.cimne.upc.edu
Sent: Tuesday, April 03, 2007 11:10 AM
Subject: Re: [GiDlist] Two layers, same mesh in plane XY, different
division in X axis.
Thanks Abel,
The problem isn't in the structured direction, it is in the plane where
the elements are unstructured.
Let's imagine I have a cube with 2 divisions in the structured direction
(z-axis) and 10 divisions per lines that form a square in the XY-plane.
I have the mesh created.
Later, I create another cube (on another layer) and I want to have
different divisions in the structured direction (z-axis), what I get it
easily, and I also want to have the same mesh in the XY-plane that both
cubes share, how could I do this last one?
Thanks in advance and best regards
Isa
Abel Coll wrote:
Dear Isa,
When you select a volume as Semi-structured, a window comes asking for
the
number of divisions in the structured direction, and you can assign a
different number of divisions to different volumes.
Regards,
ABEL
__________________________________________________________
Abel Coll Sans
CIMNE - International Center for Numerical Methods in Engineering
Office C2 - C1Building - Campus Nord UPC
Gran Capità s/n, 08034 Barcelona
Tfn: 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 Isabel Gil
Enviado el: lunes, 02 de abril de 2007 15:41
Para: GID_FORO
Asunto: [GiDlist] Two layers, same mesh in plane XY, different division
in X
axis.
Hi everybody!
I have the following question to ask:
I have two different layers in 3D (both of them belong of the same
geometry and sharing the plane XY) and I would like to use a
semistructured mesh:
- On one of the layers I would like to have a semistructured mesh in XY
plane and 4 divisions in structured direction (Z).
- On the another one I would like to have the same semistructured mesh
in XY plane but 10 divisions in structured direction (Z).
How would the way be in order to get this aim?
Any advice will be welcome.
Best regards and thanks in advance!
Isa
_______________________________________________
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
_______________________________________________
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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I didn't collapse the model. I just created the middle surface in the XY
plane, and just used it to do two extrusions (utility-copy) on either side
on this surface (the checkbox with the label 'duplicate entities' should be
unchecked). The options I used in this window are:
Entities type: Surface,
Transformation: rotation (to get the model I sent you before, perhaps in
your case should be translation),
First point..angle..second point... whatever
EmptyCheckBox - duplicate entities
Do extrude: volume
EmptyCheckBox - create contacts
(...)
In your case, where one of the volumes is already created, you should use
what you call the 'master surface' as a face of the second volume. I don't
know how do you create this second volume, but in the 'Utilities--Copy...'
window you can select this 'master surface' to do the extrusion of the
second volume.
Once the second volume is created, you can select
'Mesh--SemiStructured--Volumes' menu option. Enter the number of divisions
you want for the second volume, and click on the second volume, then press
'Escape'.
Now select 'Mesh--SemiStructured--Set--Master Surface' and click on your
'master surface'.
Now you can create your mesh.
If you don't want to remesh the first volume, just 'freeze' the layer where
the volume is: in the layer window, click on the layer and press the button
with the closed padlock icon. When a layer is frozen, it can not be edited
nor meshed.
Miguel
-----Mensaje original-----
De: gidlist-admin at gatxan.cimne.upc.edu
[mailto:gidlist-admin at gatxan.cimne.upc.edu] En nombre de Isabel Gil
Enviado el: martes, 03 de abril de 2007 17:22
Para: gidlist at gatxan.cimne.upc.edu
Asunto: Re: [GiDlist] Two layers, same mesh in plane XY, different division
in X axis.
Thank-you very much. Your plots have helped a lot.
Yes, more or less it is your problem which I was asking about.
Other questions that have sprung up are the following ones:
- Do you collapse the model? I mean, do use
"Geometry-edit-collapse-model" (or "Geometry-edit-collapse-surfaces" or
"Geometry-edit-collapse-volume") before using semistructured mesh? If
you do, which one, among these three possibilities, do you use?
- I have the same problem as you have but, in my case, the geometry that
lies on the layer (number 1) is already meshed (and although I speak of
cube, the geometry I actually use is more complicated). Then, I create
the second cube on another layer (number 2) but I would like to have the
same mesh on the master surface as you have. The only difference is that
the mesh over one cube is created previously.
Perhaps, the only solution is to create all mesh together from scratch
every time I add a new piece of my geometry. However, I have to create
and simulate my mesh little by little and if I have to create the
entirely mesh every time, it is really hard stuff, isn't it?
I don't know if I have explain myself correctly.
Again, thanks very much. I am looking forward to hearing from you.
Best regards
Isa
Miguel Pasenau wrote:
Hello,
Let's see if i've understood you:
¿you want something like the pictures I send you enclosed:
'Semistructured2cubes.png' and 'Semistructured2cubes2.png'?
To achieve this I've followed these steps:
Creation of the geometry: a square in the xy plane, and then an extrusion
with rotation of 60 degrees on the positive (in one layer) and negative Z
axis (in the other layer).
Semistructured mesh:
1. I choose 'Mesh--semistructured--Volumes' and a windows pop's up
asking
me 'Enter number of divisions and assign it to the semi-structured
volumes'.
2. I entered '4' and clicked on one volume,
3. then I entered '10' and clicked on the other volume.
4. then I pressed 'escape'.
5. now I chose 'Mesh--semistructured--Set--Master surface'
6. and selected the square which lies on the XY plane, because the mesh of
this 'master surface' will be the one to be extruded along the volumes,
i.e., the z axis.
7. and generated the mesh (Ctrl-G): 1260 Prisms.
I send you enclosed the model, too.
If this is not want you need, ¿can you send us an example?
Miguel
-----Mensaje original-----
De: gidlist-admin at gatxan.cimne.upc.edu
[mailto:gidlist-admin at gatxan.cimne.upc.edu] En nombre de Isabel Gil
Enviado el: martes, 03 de abril de 2007 13:35
Para: gidlist at gatxan.cimne.upc.edu
Asunto: Re: [GiDlist] Two layers, same mesh in plane XY, different
division
in X axis.
Sorry for my explanation.
I will try to clarify my doubts.
I have two volumes (indeed two cubes) in different layers that share one
surface.
Volume1 is already meshed and I would like to extrude its mesh made in
the sharing surface (XY-plane) into the opposite face of the Volume2.
On the other hand, I can have different divisions on the structured
direction in each volume, which is a feature that I need.
I have tried to use "Geometry-Create-Contact-Separated volume", as you
said (without using Geometry-Collapse-Model) but the message I obtain is
"2 surfaces are necessary".
Thanks in advance and best regards
Isa
Enrique Escolano wrote:
I don't understand well your questions.
Do you have two volumes in two different places, or they have some
surface
in the same location? Then they share this surface?
If a surface is shared between two volumes, then its nodes are also
shared. Maybe you need to collapse both surfaces.
If they are two separated surfaces, in general unstructured meshes
obtained can be different.
You can force the number of divisions in lines with
Mesh-Structured-Lines
If you really need to have the "same mesh" (a one-by-one relationship
between nodes), you can do a trick: create a "separated
contact volume" between this two surfaces
(Geometry-Create-Contact-Separated volume).
By default this pseudo-volume will create prisms connecting nodes, but
you
can avoid to create elemens for this volume with
Mesh-Mesh criteria-No mesh-Volumes
Regards
Enrique
----- Original Message -----
From: "Isabel Gil" misabel at litec.csic.es
To: gidlist at gatxan.cimne.upc.edu
Sent: Tuesday, April 03, 2007 11:10 AM
Subject: Re: [GiDlist] Two layers, same mesh in plane XY, different
division in X axis.
Thanks Abel,
The problem isn't in the structured direction, it is in the plane where
the elements are unstructured.
Let's imagine I have a cube with 2 divisions in the structured direction
(z-axis) and 10 divisions per lines that form a square in the XY-plane.
I have the mesh created.
Later, I create another cube (on another layer) and I want to have
different divisions in the structured direction (z-axis), what I get it
easily, and I also want to have the same mesh in the XY-plane that both
cubes share, how could I do this last one?
Thanks in advance and best regards
Isa
Abel Coll wrote:
Dear Isa,
When you select a volume as Semi-structured, a window comes asking for
the
number of divisions in the structured direction, and you can assign a
different number of divisions to different volumes.
Regards,
ABEL
__________________________________________________________
Abel Coll Sans
CIMNE - International Center for Numerical Methods in Engineering
Office C2 - C1Building - Campus Nord UPC
Gran Capità s/n, 08034 Barcelona
Tfn: 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 Isabel Gil
Enviado el: lunes, 02 de abril de 2007 15:41
Para: GID_FORO
Asunto: [GiDlist] Two layers, same mesh in plane XY, different division
in X
axis.
Hi everybody!
I have the following question to ask:
I have two different layers in 3D (both of them belong of the same
geometry and sharing the plane XY) and I would like to use a
semistructured mesh:
- On one of the layers I would like to have a semistructured mesh in XY
plane and 4 divisions in structured direction (Z).
- On the another one I would like to have the same semistructured mesh
in XY plane but 10 divisions in structured direction (Z).
How would the way be in order to get this aim?
Any advice will be welcome.
Best regards and thanks in advance!
Isa
_______________________________________________
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
_______________________________________________
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
------------------------------------------------------------------------
------------------------------------------------------------------------
_______________________________________________
GiDlist mailing list
GiDlist at gid.cimne.upc.es
http://gid.cimne.upc.es/mailman/listinfo/gidlist
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