[GiDlist] triangles, tetrahedra and nodes

GiDList Archive 2013 - 2005
1

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 :slight_smile:

Thanks in advance.

/Michael

2

Hi Michael,

looks as if we have the same kind of problem … :slight_smile:

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 :slight_smile:

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

3

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

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4

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_

5

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_

6

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

7

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_



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8

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_



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9

Thanks much Miguel..for the information..

Regards

— Miguel Pasenau miguel at cimne.upc.edu wrote:

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_



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10

Hi Miguel
I tried what you gave me an example but it didn’t
work out..especially the .msh file and I never saw
such commands you have given here.. Any further
suggestion??

Regards

— Miguel Pasenau miguel at cimne.upc.edu wrote:

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_



\

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Access over 1 million songs. Try it free.
_Yahoo is part of the Yahoo family of brands.

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GiDlist at gid.cimne.upc.es
_http://gid.cimne.upc.es/mailman/listinfo/gidlist_




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11

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

12

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

13

Hello,

does somebody know how to hide the coordinate system by plotting results in picture files like png or gif?

Thanks in advance

Rafael

14

There is a “dark” command to show/hide this axes:

escape escape escape view hardcopy options _showaxes

Enrique
----- Original Message -----
From: rafadoig at hiroshima-u.ac.jp
To: gidlist at gatxan.cimne.upc.edu
Sent: Saturday, October 15, 2005 6:16 AM
Subject: [GiDlist] coordinate system in pictures


Hello,
does somebody know how to hide the coordinate system by plotting results
in picture files like png or gif?

Thanks in advance
Rafael


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GiDlist at gid.cimne.upc.es
_http://gid.cimne.upc.es/mailman/listinfo/gidlist_

15

Hello,

I’m using Gid 7.6.0b. When I make Utilities - list - Points and pick a point belonging to 3 lines I get the folowing result:

POINT
Num: 3 HigherEntity: 3 conditions: 1 material: 0
LAYER: Layer0
Coord: 0.000000 5.000000 0.000000
END POINT
POINT (more)
Higher entities points: 1 4 11
END POINT

But I think it should be lines instead of points in: Higher entities points: 1 4 11

Best regards,
Mihai TEODORESCU

16

Yes, the correct message must be: “Higher entities lines: 1 4 11”

Thanks for your bug report

Enrique Escolano

----- Original Message -----
From: “Mihai TEODORESCU” mihai.teodorescu at prevost-industries.com
To: gidlist at gatxan.cimne.upc.edu
Sent: Tuesday, October 18, 2005 4:48 PM
Subject: [GiDlist] Probleme in reporting higher entities for a point


Hello,
I’m using Gid 7.6.0b. When I make Utilities - list - Points and pick a
point belonging to 3 lines I get the folowing result:

POINT
Num: 3 HigherEntity: 3 conditions: 1 material: 0
LAYER: Layer0
Coord: 0.000000 5.000000 0.000000
END POINT
POINT (more)
Higher entities points: 1 4 11
END POINT
But I think it should be lines instead of points in: Higher entities
points: 1 4 11

Best regards,
Mihai TEODORESCU

GiDlist mailing list
GiDlist at gid.cimne.upc.es
_http://gid.cimne.upc.es/mailman/listinfo/gidlist_

17

Hi everybody,

when creating a mesh, GiD complains about

“There are elements with negative jacobian in some node in surface 1 mesh”
“There are elements with negative jacobian in some node in surface 2 mesh”


Steps to reproduce this behaviour:

\

creating geometries

- create two rectangles

rectangle 0,0 8e-4,1e-2
rectangle 0,1e-2 8e-4,46e-2

- create a quarter of a circle

utilities copy lines DoExtrude surfaces MaintainLayers Rotation FJoin 2
TwoDim -90 2 escape

\

set import tolerance

utilities variables ImportTolerance 1e-6

collapse model

utilities collapse model yes

renumber all entities

utilities renumber yes

setup the mesh

- structured surfaces of the rectangles

Meshing Structured Surfaces 1 2 3 escape 4 2 4 escape 3 1 3 6 escape

- select quadratic elements

Meshing quadratic Quadratic

generate mesh

Meshing Generate 4e-3

==

When creating the mesh, the messages about the elemtents with negative
jacobian appeear.


This doesn’t happen, when i don’t use structured surfaces.

But the question is: If GiD already knows about elements defined in the
wrong direction meaning clockwise, why does he not correct the wrong
elements instead of telling me that there have been mistakes along the
element definition.


Regards

Martin Meiler


\

/ // /// Friedrich Alexander Universität Erlangen
_/ _/ _/ _/ Lehrstuhl für Sensorik
_/ _/ _/ Paul-Gordanstr. 5, 91052 Erlangen, Germany
_/ // //
_/ _/ _/ University of Erlangen
_/ _/ / / Department of Sensor Technology
/// // /// Paul-Gordanstr. 5, 91052 Erlangen, Germany


Dipl.-Ing. Martin Meiler

tel.: (+49)-9131-85-23140
fax.: (+49)-9131-85-23133

email: Martin.Meiler at lse.eei.uni-erlangen.de

18

Hello,

Which GiD version are you working with?

Abel Coll


----- Original Message -----
From: “Martin Meiler” Martin.Meiler at lse.eei.uni-erlangen.de
To: gidlist at gatxan.cimne.upc.edu
Sent: Wednesday, October 19, 2005 9:40 AM
Subject: [GiDlist] Problems with Mesh-Generation


Hi everybody,
when creating a mesh, GiD complains about
“There are elements with negative jacobian in some node in surface 1 mesh”
“There are elements with negative jacobian in some node in surface 2 mesh”

Steps to reproduce this behaviour:

# creating geometries
# - create two rectangles
rectangle 0,0 8e-4,1e-2
rectangle 0,1e-2 8e-4,46e-2
# - create a quarter of a circle
utilities copy lines DoExtrude surfaces MaintainLayers Rotation FJoin 2
TwoDim -90 2 escape

# set import tolerance
utilities variables ImportTolerance 1e-6
# collapse model
utilities collapse model yes
# renumber all entities
utilities renumber yes
# setup the mesh
# - structured surfaces of the rectangles
Meshing Structured Surfaces 1 2 3 escape 4 2 4 escape 3 1 3 6 escape
# - select quadratic elements
Meshing quadratic Quadratic
# generate mesh
Meshing Generate 4e-3
==
When creating the mesh, the messages about the elemtents with negative
jacobian appeear.

This doesn’t happen, when i don’t use structured surfaces.
But the question is: If GiD already knows about elements defined in the
wrong direction meaning clockwise, why does he not correct the wrong
elements instead of telling me that there have been mistakes along the
element definition.

Regards
Martin Meiler


–
--------------------------------------------------------------------
__/ // /// Friedrich Alexander Universität Erlangen
__/ _/ _/ / Lehrstuhl für Sensorik
__/ _/ / Paul-Gordanstr. 5, 91052 Erlangen, Germany
_/ // //
_/ / / University of Erlangen
__/ / / / Department of Sensor Technology
__/// // /// Paul-Gordanstr. 5, 91052 Erlangen, Germany

Dipl.-Ing. Martin Meiler
tel.: (+49)-9131-85-23140
fax.: (+49)-9131-85-23133
email: Martin.Meiler at lse.eei.uni-erlangen.de

GiDlist mailing list
GiDlist at gid.cimne.upc.es
_http://gid.cimne.upc.es/mailman/listinfo/gidlist_

19

Hi,

i’m working with the latest GiD beta 7.6.0b on an SuSE linux machine.

Bye Martin


Abel Coll wrote:
Hello,
Which GiD version are you working with?
Abel Coll

----- Original Message -----
From: “Martin Meiler” Martin.Meiler at lse.eei.uni-erlangen.de
To: gidlist at gatxan.cimne.upc.edu
Sent: Wednesday, October 19, 2005 9:40 AM
Subject: [GiDlist] Problems with Mesh-Generation

Hi everybody,
when creating a mesh, GiD complains about
“There are elements with negative jacobian in some node in surface 1 mesh”
“There are elements with negative jacobian in some node in surface 2 mesh”

Steps to reproduce this behaviour:

# creating geometries
# - create two rectangles
rectangle 0,0 8e-4,1e-2
rectangle 0,1e-2 8e-4,46e-2
# - create a quarter of a circle
utilities copy lines DoExtrude surfaces MaintainLayers Rotation FJoin 2
TwoDim -90 2 escape

# set import tolerance
utilities variables ImportTolerance 1e-6
# collapse model
utilities collapse model yes
# renumber all entities
utilities renumber yes
# setup the mesh
# - structured surfaces of the rectangles
Meshing Structured Surfaces 1 2 3 escape 4 2 4 escape 3 1 3 6 escape
# - select quadratic elements
Meshing quadratic Quadratic
# generate mesh
Meshing Generate 4e-3
==
When creating the mesh, the messages about the elemtents with negative
jacobian appeear.

This doesn’t happen, when i don’t use structured surfaces.
But the question is: If GiD already knows about elements defined in the
wrong direction meaning clockwise, why does he not correct the wrong
elements instead of telling me that there have been mistakes along the
element definition.

Regards
Martin Meiler


–
--------------------------------------------------------------------
__/ // /// Friedrich Alexander Universität Erlangen
__/ _/ _/ / Lehrstuhl für Sensorik
__/ _/ / Paul-Gordanstr. 5, 91052 Erlangen, Germany
_/ // //
_/ / / University of Erlangen
__/ / / / Department of Sensor Technology
__/// // /// Paul-Gordanstr. 5, 91052 Erlangen, Germany

Dipl.-Ing. Martin Meiler
tel.: (+49)-9131-85-23140
fax.: (+49)-9131-85-23133
email: Martin.Meiler at lse.eei.uni-erlangen.de

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_



\

/ // /// Friedrich Alexander Universität Erlangen
_/ _/ _/ _/ Lehrstuhl für Sensorik
_/ _/ _/ Paul-Gordanstr. 5, 91052 Erlangen, Germany
_/ // //
_/ _/ _/ University of Erlangen
_/ _/ / / Department of Sensor Technology
/// // /// Paul-Gordanstr. 5, 91052 Erlangen, Germany


Dipl.-Ing. Martin Meiler

tel.: (+49)-9131-85-23140
fax.: (+49)-9131-85-23133

email: Martin.Meiler at lse.eei.uni-erlangen.de

20

Hello,

Thanks for notifying us this behaviour. It is now corrected, so it will be
available to you in the next beta version, that provably will be ready in
this week.

Regards.

ABEL



----- Original Message -----
From: “Martin Meiler” Martin.Meiler at lse.eei.uni-erlangen.de
To: gidlist at gatxan.cimne.upc.edu
Sent: Wednesday, October 19, 2005 2:51 PM
Subject: Re: [GiDlist] Problems with Mesh-Generation


Hi,
i’m working with the latest GiD beta 7.6.0b on an SuSE linux machine.
Bye Martin

Abel Coll wrote:
Hello,
Which GiD version are you working with?
Abel Coll

----- Original Message -----
From: “Martin Meiler” Martin.Meiler at lse.eei.uni-erlangen.de
To: gidlist at gatxan.cimne.upc.edu
Sent: Wednesday, October 19, 2005 9:40 AM
Subject: [GiDlist] Problems with Mesh-Generation

Hi everybody,
when creating a mesh, GiD complains about
"There are elements with negative jacobian in some node in surface 1
mesh"
"There are elements with negative jacobian in some node in surface 2
mesh"


Steps to reproduce this behaviour:

# creating geometries
# - create two rectangles
rectangle 0,0 8e-4,1e-2
rectangle 0,1e-2 8e-4,46e-2
# - create a quarter of a circle
utilities copy lines DoExtrude surfaces MaintainLayers Rotation FJoin 2
TwoDim -90 2 escape

# set import tolerance
utilities variables ImportTolerance 1e-6
# collapse model
utilities collapse model yes
# renumber all entities
utilities renumber yes
# setup the mesh
# - structured surfaces of the rectangles
Meshing Structured Surfaces 1 2 3 escape 4 2 4 escape 3 1 3 6 escape
# - select quadratic elements
Meshing quadratic Quadratic
# generate mesh
Meshing Generate 4e-3
==
When creating the mesh, the messages about the elemtents with negative
jacobian appeear.

This doesn’t happen, when i don’t use structured surfaces.
But the question is: If GiD already knows about elements defined in the
wrong direction meaning clockwise, why does he not correct the wrong
elements instead of telling me that there have been mistakes along the
element definition.

Regards
Martin Meiler


–
--------------------------------------------------------------------
__/ // /// Friedrich Alexander Universität Erlangen
__/ _/ _/ / Lehrstuhl für Sensorik
__/ _/ / Paul-Gordanstr. 5, 91052 Erlangen, Germany
_/ // //
_/ / / University of Erlangen
__/ / / / Department of Sensor Technology
__/// // /// Paul-Gordanstr. 5, 91052 Erlangen, Germany

Dipl.-Ing. Martin Meiler
tel.: (+49)-9131-85-23140
fax.: (+49)-9131-85-23133
email: Martin.Meiler at lse.eei.uni-erlangen.de

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_




–
--------------------------------------------------------------------
__/ // /// Friedrich Alexander Universität Erlangen_
__/ _/ _/ / Lehrstuhl für Sensorik
__/ _/ / Paul-Gordanstr. 5, 91052 Erlangen, Germany
_/ // //
_/ / / University of Erlangen
__/ / / / Department of Sensor Technology
__/// // /// Paul-Gordanstr. 5, 91052 Erlangen, Germany

Dipl.-Ing. Martin Meiler
tel.: (+49)-9131-85-23140
fax.: (+49)-9131-85-23133
email: Martin.Meiler at lse.eei.uni-erlangen.de

GiDlist mailing list
GiDlist at gid.cimne.upc.es
_http://gid.cimne.upc.es/mailman/listinfo/gidlist_