[GiDlist] triangles, tetrahedra and nodes

Moderator: GiD Team

Michael Nielsen

[GiDlist] triangles, tetrahedra and nodes

Postby Michael Nielsen » Wed Oct 12, 2005 10:30 am

Hi there!

If i have a .igs model and i need both a triangular model and a tetrahedral
model to be generated, but they MUST have the same nodes defined and in the
same order. Is that possible with GiD? How? When i try i get a small
discrepancy in the number of nodes, but somewhere around halfway through the
nodes the ordering of them changes significantly.

It might sound strange, but what i need is a tetrahedral mesh, all surface
nodes, with 2d
texture coordinates. If any of you have a better tool, then i'm all ears :)

Thanks in advance.

/Michael
Sören Schwarz

[GiDlist] define fixed points/lines when meshing

Postby Sören Schwarz » Wed Oct 12, 2005 10:59 am

Warning: This message has had one or more attachments removed.
Warning: Please read the "VirusWarning.txt" attachment(s) for more information.

Dear GiD-Users and Developers,

I have a problem with generating reinforced concrete members. I want
to define concrete volume elements with line elements for the steel
reinforcement. Both types of elements have to use the same nodes where
the reinforcement is located. I tried to solve the problem by defining
two exactly located lines, one to define surfaces/volumes for the
concrete elements and one for the line elements, but GiD meshes them
differently ...

This should be a common problem for everybody, who works in the field
of civil/structural engineering. I also could think of meshing in two
steps, first the reinforcement, then the volume by defining the nodes
of the line elements as fixed for the mesh ceneration of the volume
elements but GiD doesn't have this feature ... ? To demonstrate the
problem, I attached a model of a concrete slab with reinforcement ...
(it's just half of the model because it's symmetric)

Any suggestions? Thank you in advance.

Soeren Schwarz
___________________________________________________

Universität Leipzig
Wirtschaftswissenschaftliche Fakultät
Institut für Massivbau und Baustofftechnologie
Marschnerstrasse 31
04109 Leipzig
___________________________________________________

Dipl.-Ing. Sören Schwarz
Tel.: 0341/97-33800 (Sekretariat)
Tel.: 0341/97-33813 (Durchwahl)
Fax: 0341/97-33809
e-mail: sschwarz at wifa.uni-leipzig.de
URL: http://www.uni-leipzig.de/massivbau
___________________________________________________
-------------- next part --------------
A non-text attachment was scrubbed...
Name: concrete-slab.cnd
Type: application/octet-stream
Size: 1284 bytes
Desc: not available
Url : http://listas.cimne.upc.edu/pipermail/gidlist/attachments/20051012/b003ebc0/attachment.obj
-------------- next part --------------
A non-text attachment was scrubbed...
Name: concrete-slab.geo
Type: application/octet-stream
Size: 92338 bytes
Desc: not available
Url : http://listas.cimne.upc.edu/pipermail/gidlist/attachments/20051012/b003ebc0/attachment-0001.obj
-------------- next part --------------
A non-text attachment was scrubbed...
Name: concrete-slab.lin
Type: application/octet-stream
Size: 68 bytes
Desc: not available
Url : http://listas.cimne.upc.edu/pipermail/gidlist/attachments/20051012/b003ebc0/attachment-0002.obj
-------------- next part --------------
This is a message from the MailScanner E-Mail Virus Protection Service
----------------------------------------------------------------------
The original e-mail attachment "concrete-slab.mat"
is on the list of unacceptable attachments for this site and has been
replaced by this warning message.

If you wish to receive a copy of the original attachment, please
e-mail helpdesk and include the whole of this message
in your request. Alternatively, you can call them, with
the contents of this message to hand when you call.

At Wed Oct 12 12:13:13 2005 the virus scanner said:
Microsoft Access Shortcuts are dangerous in email in concrete-slab.mat

Note to Help Desk: Look on the MailScanner in /var/spool/mailscanner/quarantine (message j9CACokr006615).
--
Postmaster
-------------- next part --------------
A non-text attachment was scrubbed...
Name: concrete-slab.msh
Type: application/octet-stream
Size: 597968 bytes
Desc: not available
Url : http://listas.cimne.upc.edu/pipermail/gidlist/attachments/20051012/b003ebc0/attachment-0003.obj
-------------- next part --------------
A non-text attachment was scrubbed...
Name: concrete-slab.prb
Type: application/octet-stream
Size: 602 bytes
Desc: not available
Url : http://listas.cimne.upc.edu/pipermail/gidlist/attachments/20051012/b003ebc0/attachment-0004.obj
-------------- next part --------------
A non-text attachment was scrubbed...
Name: concrete-slab.rdr
Type: application/octet-stream
Size: 796 bytes
Desc: not available
Url : http://listas.cimne.upc.edu/pipermail/gidlist/attachments/20051012/b003ebc0/attachment-0005.obj
Sören Schwarz

[GiDlist] triangles, tetrahedra and nodes

Postby Sören Schwarz » Wed Oct 12, 2005 11:45 am

Hi Michael,

looks as if we have the same kind of problem ... :-)

Sören

Wednesday, October 12, 2005, 11:16:37 AM, you wrote:

MN Hi there!

MN If i have a .igs model and i need both a triangular model and a tetrahedral
MN model to be generated, but they MUST have the same nodes defined and in the
MN same order. Is that possible with GiD? How? When i try i get a small
MN discrepancy in the number of nodes, but somewhere around halfway through the
MN nodes the ordering of them changes significantly.

MN It might sound strange, but what i need is a tetrahedral mesh, all surface
MN nodes, with 2d
MN texture coordinates. If any of you have a better tool, then i'm all ears :)

MN Thanks in advance.

MN /Michael

MN _______________________________________________
MN GiDlist mailing list
MN GiDlist at gid.cimne.upc.es
MN http://gid.cimne.upc.es/mailman/listinfo/gidlist
User avatar
abelcs
Posts: 141
Joined: Mon Oct 13, 2014 9:14 am

[GiDlist] define fixed points/lines when meshing

Postby abelcs » Fri Oct 14, 2005 8:43 am

Hello, Soren,

GiD meshes the geometrical entities hierarchically. It means that when a
volume have to be meshed, first of all, all its contour surfaces are meshed,
wich, at the same time, needs its lines meshes to be meshed.
The problem you have is that the lines that define the steel reinforcement
are not part of the volume (topollogically). If you want that lines meshes
share nodes with volume elements, the only way to do it is to create
surfaces owning the lines, and split the volume in different volumes
(smaller), with that surfaces as the contour ones.

Regards,

ABEL


----- Original Message -----
From: "Sören Schwarz" sschwarz at wifa.uni-leipzig.de
To: gidlist at gatxan.cimne.upc.es
Sent: Wednesday, October 12, 2005 11:40 AM
Subject: [GiDlist] define fixed points/lines when meshing


Warning: This message has had one or more attachments removed.
Warning: Please read the "VirusWarning.txt" attachment(s) for more
information.

Dear GiD-Users and Developers,

I have a problem with generating reinforced concrete members. I want
to define concrete volume elements with line elements for the steel
reinforcement. Both types of elements have to use the same nodes where
the reinforcement is located. I tried to solve the problem by defining
two exactly located lines, one to define surfaces/volumes for the
concrete elements and one for the line elements, but GiD meshes them
differently ...

This should be a common problem for everybody, who works in the field
of civil/structural engineering. I also could think of meshing in two
steps, first the reinforcement, then the volume by defining the nodes
of the line elements as fixed for the mesh ceneration of the volume
elements but GiD doesn't have this feature ... ? To demonstrate the
problem, I attached a model of a concrete slab with reinforcement ...
(it's just half of the model because it's symmetric)

Any suggestions? Thank you in advance.

Soeren Schwarz
___________________________________________________

Universität Leipzig
Wirtschaftswissenschaftliche Fakultät
Institut für Massivbau und Baustofftechnologie
Marschnerstrasse 31
04109 Leipzig
___________________________________________________

Dipl.-Ing. Sören Schwarz
Tel.: 0341/97-33800 (Sekretariat)
Tel.: 0341/97-33813 (Durchwahl)
Fax: 0341/97-33809
e-mail: sschwarz at wifa.uni-leipzig.de
URL: http://www.uni-leipzig.de/massivbau
___________________________________________________

Andreas Hauck

[GiDlist] {SPAM?} Logarithmic scaling of results

Postby Andreas Hauck » Fri Oct 14, 2005 11:02 am

Hi,

is there a possibility in GiD to visualize scalar and vectorial results
with logarithmic scaling (e.g. acoustic pressure)?

Regards
Andreas

--
_/ _/_/ _/_/_/ Friedrich Alexander Universität Erlangen
_/ _/ _/ _/ Lehrstuhl für Sensorik
_/ _/ _/ Paul-Gordan-Str. 3-5, D-91052 Erlangen
_/ _/_/ _/_/_/
_/ _/ _/ Friedrich Alexander University Erlangen
_/ _/ _/ _/ Department of Sensor Technology
_/_/_/ _/_/ _/_/_/ Paul-Gordan-Str. 3-5, D-91052 Erlangen

M.Sc. Andreas Hauck

email.: andreas.hauck at lse.eei.uni-erlangen.de
url. : http://www.lse.uni-erlangen.de
tel. : (+49)-9131-85-23147
fax. : (+49)-9131-85-23133
Andreas Hauck

[GiDlist] Logarithmic scaling of results

Postby Andreas Hauck » Fri Oct 14, 2005 11:20 am

Hi,

is there a possibility in GiD to visualize scalar and vectorial results
with logarithmic scaling (e.g. acoustic pressure)?

Regards
Andreas

--
_/ _/_/ _/_/_/ Friedrich Alexander Universität Erlangen
_/ _/ _/ _/ Lehrstuhl für Sensorik
_/ _/ _/ Paul-Gordan-Str. 3-5, D-91052 Erlangen
_/ _/_/ _/_/_/
_/ _/ _/ Friedrich Alexander University Erlangen
_/ _/ _/ _/ Department of Sensor Technology
_/_/_/ _/_/ _/_/_/ Paul-Gordan-Str. 3-5, D-91052 Erlangen

M.Sc. Andreas Hauck

email.: andreas.hauck at lse.eei.uni-erlangen.de
url. : http://www.lse.uni-erlangen.de
tel. : (+49)-9131-85-23147
fax. : (+49)-9131-85-23133
VSayako Willy

[GiDlist] How to display a node as a ball

Postby VSayako Willy » Fri Oct 14, 2005 11:34 am

Hi GiD Team

I found that some of the User displayed the mesh
with a nice nodal ball.. I have tried in the Render
customize but it dind't work.. How would you do that
I herewith attached the file that I found it
Regards..


--- Andreas Hauck
andreas.hauck at lse.eei.uni-erlangen.de wrote:

Hi,

is there a possibility in GiD to visualize scalar
and vectorial results
with logarithmic scaling (e.g. acoustic pressure)?

Regards
Andreas

--
_/ _/_/ _/_/_/ Friedrich Alexander
Universität Erlangen
_/ _/ _/ _/ Lehrstuhl für
Sensorik
_/ _/ _/ Paul-Gordan-Str. 3-5,
D-91052 Erlangen
_/ _/_/ _/_/_/
_/ _/ _/ Friedrich Alexander
University Erlangen
_/ _/ _/ _/ Department of
Sensor Technology
_/_/_/ _/_/ _/_/_/ Paul-Gordan-Str. 3-5,
D-91052 Erlangen

M.Sc. Andreas Hauck

email.: andreas.hauck at lse.eei.uni-erlangen.de
url. : http://www.lse.uni-erlangen.de
tel. : (+49)-9131-85-23147
fax. : (+49)-9131-85-23133
_______________________________________________
GiDlist mailing list
GiDlist at gid.cimne.upc.es
http://gid.cimne.upc.es/mailman/listinfo/gidlist





__________________________________
Yahoo! Music Unlimited
Access over 1 million songs. Try it free.
http://music.yahoo.com/unlimited/
-------------- next part --------------
A non-text attachment was scrubbed...
Name: MESH.bmp
Type: image/bmp
Size: 226470 bytes
Desc: 1855625856-MESH.bmp
Url : http://listas.cimne.upc.edu/pipermail/gidlist/attachments/20051014/c027ca42/attachment.bin
User avatar
escolano
Posts: 1627
Joined: Thu Sep 18, 2014 3:31 pm

[GiDlist] define fixed points/lines when meshing

Postby escolano » Fri Oct 14, 2005 2:59 pm

Hello Soren & Michael,

As Abel remarked, to obtain tetrahedras with nodes on the lines, it'
necessary that this lines are in the boundary of a surface, that is in the
boundary of the volume. Several "steel" lines are not each other
intersected, then will not be generated a common node, you also need to
intersect this lines if they are really connected.

In other hand, by default, when GiD generate for example a mesh, then are
not explicitly created the "lower hierarchy elements", for example, when
generate a tetrahedral mesh from a volume, are not created triangle, or line
elements.
To force to have this "lower hierarchy elements", you must assign this
criteria to the desired geometric entities:
Mesh-Mesh criteria-Mesh- Lines or surfaces
They will be generated also triangles and/or lines, but will not be
generated any new node, they are shared with the tetrahedral ones.

Regards
Enrique Escolano

----- Original Message -----
From: "Abel Coll" abelcs at cimne.upc.edu
To: gidlist at gatxan.cimne.upc.edu
Sent: Friday, October 14, 2005 9:29 AM
Subject: Re: [GiDlist] define fixed points/lines when meshing



Hello, Soren,

GiD meshes the geometrical entities hierarchically. It means that when a
volume have to be meshed, first of all, all its contour surfaces are
meshed,
wich, at the same time, needs its lines meshes to be meshed.
The problem you have is that the lines that define the steel reinforcement
are not part of the volume (topollogically). If you want that lines meshes
share nodes with volume elements, the only way to do it is to create
surfaces owning the lines, and split the volume in different volumes
(smaller), with that surfaces as the contour ones.

Regards,

ABEL


----- Original Message -----
From: "Sören Schwarz" sschwarz at wifa.uni-leipzig.de
To: gidlist at gatxan.cimne.upc.es
Sent: Wednesday, October 12, 2005 11:40 AM
Subject: [GiDlist] define fixed points/lines when meshing


Warning: This message has had one or more attachments removed.
Warning: Please read the "VirusWarning.txt" attachment(s) for more
information.

Dear GiD-Users and Developers,

I have a problem with generating reinforced concrete members. I want
to define concrete volume elements with line elements for the steel
reinforcement. Both types of elements have to use the same nodes where
the reinforcement is located. I tried to solve the problem by defining
two exactly located lines, one to define surfaces/volumes for the
concrete elements and one for the line elements, but GiD meshes them
differently ...

This should be a common problem for everybody, who works in the field
of civil/structural engineering. I also could think of meshing in two
steps, first the reinforcement, then the volume by defining the nodes
of the line elements as fixed for the mesh ceneration of the volume
elements but GiD doesn't have this feature ... ? To demonstrate the
problem, I attached a model of a concrete slab with reinforcement ...
(it's just half of the model because it's symmetric)

Any suggestions? Thank you in advance.

Soeren Schwarz
___________________________________________________

Universität Leipzig
Wirtschaftswissenschaftliche Fakultät
Institut für Massivbau und Baustofftechnologie
Marschnerstrasse 31
04109 Leipzig
___________________________________________________

Dipl.-Ing. Sören Schwarz
Tel.: 0341/97-33800 (Sekretariat)
Tel.: 0341/97-33813 (Durchwahl)
Fax: 0341/97-33809
e-mail: sschwarz at wifa.uni-leipzig.de
URL: http://www.uni-leipzig.de/massivbau
___________________________________________________


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

User avatar
miguel
Posts: 346
Joined: Thu Sep 25, 2014 9:04 am

[GiDlist] Logarithmic scaling of results

Postby miguel » Fri Oct 14, 2005 4:29 pm

By now the only way to operate results is through Tcl-Tk, with

GiD_Result get {"pressure" "acoustic analysis" 1.0}

Operate this result in order to change its scale and then

GiD_Result create {Result "Log pressure" "acoustic analysis" 1.0 scalar
onnodes} {node_id_1 value_1} {node_id_2 value_2} ...

You can find more info here (Tcl-Tk extensions-Special functions):
http://www.gidhome.com/support/gidbeta/gid_18.subst#SEC293
(look for GiD_Result)

Best regards

miguel

-----Mensaje original-----
De: gidlist-admin at gatxan.cimne.upc.edu
[mailto:gidlist-admin at gatxan.cimne.upc.edu] En nombre de Andreas Hauck
Enviado el: viernes, 14 de octubre de 2005 11:35
Para: gidlist at gatxan.cimne.upc.es
Asunto: [GiDlist] Logarithmic scaling of results

Hi,

is there a possibility in GiD to visualize scalar and vectorial results
with logarithmic scaling (e.g. acoustic pressure)?

Regards
Andreas

--
_/ _/_/ _/_/_/ Friedrich Alexander Universität Erlangen
_/ _/ _/ _/ Lehrstuhl für Sensorik
_/ _/ _/ Paul-Gordan-Str. 3-5, D-91052 Erlangen
_/ _/_/ _/_/_/
_/ _/ _/ Friedrich Alexander University Erlangen
_/ _/ _/ _/ Department of Sensor Technology
_/_/_/ _/_/ _/_/_/ Paul-Gordan-Str. 3-5, D-91052 Erlangen

M.Sc. Andreas Hauck

email.: andreas.hauck at lse.eei.uni-erlangen.de
url. : http://www.lse.uni-erlangen.de
tel. : (+49)-9131-85-23147
fax. : (+49)-9131-85-23133

_______________________________________________
GiDlist mailing list
GiDlist at gid.cimne.upc.es
http://gid.cimne.upc.es/mailman/listinfo/gidlist
User avatar
miguel
Posts: 346
Joined: Thu Sep 25, 2014 9:04 am

[GiDlist] How to display a node as a ball

Postby miguel » Fri Oct 14, 2005 4:29 pm

Well, in post there is the 'points' display style which draws points or
spheres at the nodes (Options-Geometry-Point options).

But to achieve what you see at your picture, the only way I see is to create
'point' elements on your nodes and 'line' elements on your edges.

Something like this (just 2 balls and 1 edge):

MESH "balls" dimension 3 Elemtype Point Nnode 1
Coordinates
1 0.0
2 1.0
End coordinates
Elements
1 1
2 2
End elements

MESH "bars" dimension 3 ElemType Lineas Nnode 2
Coordinates
End Coordinates
Elements
1 1 2
End Elements

If you want to change the balls and lines visualization, just use the
"Options-Geometry-Points options" and "Options-Geometry-Line Options".
reagrds

miguel

-----Mensaje original-----
De: gidlist-admin at gatxan.cimne.upc.edu
[mailto:gidlist-admin at gatxan.cimne.upc.edu] En nombre de VSayako Willy
Enviado el: viernes, 14 de octubre de 2005 12:26
Para: gidlist at gatxan.cimne.upc.edu
Asunto: [GiDlist] How to display a node as a ball


Hi GiD Team

I found that some of the User displayed the mesh
with a nice nodal ball.. I have tried in the Render
customize but it dind't work.. How would you do that
I herewith attached the file that I found it
Regards..


--- Andreas Hauck
andreas.hauck at lse.eei.uni-erlangen.de wrote:

Hi,

is there a possibility in GiD to visualize scalar
and vectorial results
with logarithmic scaling (e.g. acoustic pressure)?

Regards
Andreas

--
_/ _/_/ _/_/_/ Friedrich Alexander
Universität Erlangen
_/ _/ _/ _/ Lehrstuhl für
Sensorik
_/ _/ _/ Paul-Gordan-Str. 3-5,
D-91052 Erlangen
_/ _/_/ _/_/_/
_/ _/ _/ Friedrich Alexander
University Erlangen
_/ _/ _/ _/ Department of
Sensor Technology
_/_/_/ _/_/ _/_/_/ Paul-Gordan-Str. 3-5,
D-91052 Erlangen

M.Sc. Andreas Hauck

email.: andreas.hauck at lse.eei.uni-erlangen.de
url. : http://www.lse.uni-erlangen.de
tel. : (+49)-9131-85-23147
fax. : (+49)-9131-85-23133
_______________________________________________
GiDlist mailing list
GiDlist at gid.cimne.upc.es
http://gid.cimne.upc.es/mailman/listinfo/gidlist





__________________________________
Yahoo! Music Unlimited
Access over 1 million songs. Try it free.
http://music.yahoo.com/unlimited/

Return to “2013 - 2005”

Who is online

Users browsing this forum: No registered users and 2 guests