[GiDlist] Re: Boundary condition

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淑红

[GiDlist] Re: Boundary condition

Post by 淑红 »

Thank yo for your reply.

It is too difficult to apply the boundary condition directly to the mesh when the project is complicated.

what is 'compass toolkit' you referred to? is it the problemtype 'Lsdyna'? how does the group work?

Today, I tried another way. I exported the gid mesh as a ''.msh' file after I created a mesh.
When I change the bounday condition, I erase the old mesh and import the file that I export. Why does it make no difference? The file that I import in should be considered ad the new mesh, isn't it?

Hoping for your reply.

Regards.

Shuhong Tan




--- 11年3月9日,周三, gidlist-request at listas.cimne.upc.edu gidlist-request at listas.cimne.upc.edu 写道:


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主题: GiDlist Digest, Vol 9, Issue 1
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日期: 2011年3月9日,周三,下午7:00


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Today's Topics:

1. boundary condition (??)
2. Re: boundary condition (Enrique Escolano)


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Message: 1
Date: Tue, 8 Mar 2011 22:30:51 +0800 (CST)
From: ?? shuhong_tan at yahoo.cn
Subject: [GiDlist] boundary condition
To: gidlist at listas.cimne.upc.edu
Message-ID: 632563.60352.qm at web15806.mail.cnb.yahoo.com
Content-Type: text/plain; charset="utf-8"

Dear Gidlist,
?
I have a question about boundary condition.
?
I have a mesh already, with boundary condition and material parameters. Now, I'd like to change the boundary condition without remeshing. Is there some way to do this? Or how can I define different boundary conditions to one mesh?
?
Thank you very much. I 'm looking forward for your reply.
?
Shuhong Tan



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Message: 2
Date: Tue, 8 Mar 2011 16:39:51 +0100
From: "Enrique Escolano" escolano at cimne.upc.edu
Subject: Re: [GiDlist] boundary condition
To: gidlist at listas.cimne.upc.edu
Message-ID: 3E1710963A544BA5A77E4D8DDA9AF81C at mediador
Content-Type: text/plain; charset="utf-8"

If you change only the values of the materials , remeshing is not necessary, because the entities will point to the same updated material,
but if you change the conditions applied to the geometry it is necessary to remesh to have the new conditions applied over the mesh
(you can apply also directly conditions to the mesh, but is is unrecommended, and probably the selection will be very difficult)

If your problemtype were created using the 'compass toolkit', the conditions are applied over 'groups', and it is possible to change some condition values without need to create again the mesh, because the 'groups of the mesh' remain unchanged

Regards

Enrique
----- Original Message -----
From: ??
To: gidlist at listas.cimne.upc.edu
Sent: Tuesday, March 08, 2011 3:30 PM
Subject: [GiDlist] boundary condition


Dear Gidlist,

I have a question about boundary condition.

I have a mesh already, with boundary condition and material parameters. Now, I'd like to change the boundary condition without remeshing. Is there some way to do this? Or how can I define different boundary conditions to one mesh?

Thank you very much. I 'm looking forward for your reply.

Shuhong Tan




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User avatar
escolano
Posts: 1918
Joined: Sun Sep 05, 1982 10:51 pm

[GiDlist] Re: Boundary condition

Post by escolano »

I tink that the problem is that you have applied the conditions directly to the mesh, not?
Why don't you apply the conditions to the geometry? This is the 'normal way'
Then if you change conditions on the geometry you must only remesh and all will be automatically applied over the new mesh.

Exporting the mesh you will only export nodes and elements, but not values of applied conditions.
Reimporting this mesh you will lost this attached data. Don't use this approach!!

The 'Compass toolkit' is used by the Ls-dyna problemtype for example. http://www.compassis.com/compass/en/Productos/CompassLIB
It uses a different approach: first enties are classified in groups, and then the 'conditions' are assigned to this groups.
Then changing the value of some 'condition field' it is not necessary to remesh, because the groups of the entities didn't change.


----- Original Message -----
From: 淑红
To: gidlist at listas.cimne.upc.edu
Sent: Wednesday, March 09, 2011 6:02 PM
Subject: [GiDlist] Re: Boundary condition



Thank yo for your reply.

It is too difficult to apply the boundary condition directly to the mesh when the project is complicated.

what is 'compass toolkit' you referred to? is it the problemtype 'Lsdyna'? how does the group work?

Today, I tried another way. I exported the gid mesh as a ''.msh' file after I created a mesh.
When I change the bounday condition, I erase the old mesh and import the file that I export. Why does it make no difference? The file that I import in should be considered ad the new mesh, isn't it?

Hoping for your reply.

Regards.

Shuhong Tan




--- 11年3月9日,周三, gidlist-request at listas.cimne.upc.edu gidlist-request at listas.cimne.upc.edu 写道:


发件人: gidlist-request at listas.cimne.upc.edu gidlist-request at listas.cimne.upc.edu
主题: GiDlist Digest, Vol 9, Issue 1
收件人: gidlist at listas.cimne.upc.edu
日期: 2011年3月9日,周三,下午7:00


Send GiDlist mailing list submissions to
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You can reach the person managing the list at
gidlist-owner at listas.cimne.upc.edu

When replying, please edit your Subject line so it is more specific
than "Re: Contents of GiDlist digest..."


Today's Topics:

1. boundary condition (??)
2. Re: boundary condition (Enrique Escolano)


----------------------------------------------------------------------

Message: 1
Date: Tue, 8 Mar 2011 22:30:51 +0800 (CST)
From: ?? shuhong_tan at yahoo.cn
Subject: [GiDlist] boundary condition
To: gidlist at listas.cimne.upc.edu
Message-ID: 632563.60352.qm at web15806.mail.cnb.yahoo.com
Content-Type: text/plain; charset="utf-8"

Dear Gidlist,
?
I have a question about boundary condition.
?
I have a mesh already, with boundary condition and material parameters. Now, I'd like to change the boundary condition without remeshing. Is there some way to do this? Or how can I define different boundary conditions to one mesh?
?
Thank you very much. I 'm looking forward for your reply.
?
Shuhong Tan



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Message: 2
Date: Tue, 8 Mar 2011 16:39:51 +0100
From: "Enrique Escolano" escolano at cimne.upc.edu
Subject: Re: [GiDlist] boundary condition
To: gidlist at listas.cimne.upc.edu
Message-ID: 3E1710963A544BA5A77E4D8DDA9AF81C at mediador
Content-Type: text/plain; charset="utf-8"

If you change only the values of the materials , remeshing is not necessary, because the entities will point to the same updated material,
but if you change the conditions applied to the geometry it is necessary to remesh to have the new conditions applied over the mesh
(you can apply also directly conditions to the mesh, but is is unrecommended, and probably the selection will be very difficult)

If your problemtype were created using the 'compass toolkit', the conditions are applied over 'groups', and it is possible to change some condition values without need to create again the mesh, because the 'groups of the mesh' remain unchanged

Regards

Enrique
----- Original Message -----
From: ??
To: gidlist at listas.cimne.upc.edu
Sent: Tuesday, March 08, 2011 3:30 PM
Subject: [GiDlist] boundary condition


Dear Gidlist,

I have a question about boundary condition.

I have a mesh already, with boundary condition and material parameters. Now, I'd like to change the boundary condition without remeshing. Is there some way to do this? Or how can I define different boundary conditions to one mesh?

Thank you very much. I 'm looking forward for your reply.

Shuhong Tan




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User avatar
abelcs
Posts: 146
Joined: Mon Oct 13, 2014 9:14 am

[GiDlist] Re: Boundary condition

Post by abelcs »

Dear Shuhong,

you can find information about how to create a problemtype using the compasslib in the 'advanced problemtype creation' tutorial, from the website:

http://www.gidhome.com/news/gid-conf/gid-conference-2010/pre-conference-courses

Regards,

ABEL

_________________________________
Abel Coll Sans - Civil Engineer
CIMNE - International Center for Numerical Methods in Engineering
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Gran Capità s/n, 08034 Barcelona
T: 34 - 93 401 74 03 Fax: 34 - 93 40 65 17
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De: gidlist-bounces at listas.cimne.upc.edu [mailto:gidlist-bounces at listas.cimne.upc.edu] En nombre de Enrique Escolano
Enviado el: miércoles, 09 de marzo de 2011 20:04
Para: gidlist at listas.cimne.upc.edu
Asunto: Re: [GiDlist] Re: Boundary condition


I tink that the problem is that you have applied the conditions directly to the mesh, not?
Why don't you apply the conditions to the geometry? This is the 'normal way'
Then if you change conditions on the geometry you must only remesh and all will be automatically applied over the new mesh.

Exporting the mesh you will only export nodes and elements, but not values of applied conditions.
Reimporting this mesh you will lost this attached data. Don't use this approach!!

The 'Compass toolkit' is used by the Ls-dyna problemtype for example. http://www.compassis.com/compass/en/Productos/CompassLIB
It uses a different approach: first enties are classified in groups, and then the 'conditions' are assigned to this groups.
Then changing the value of some 'condition field' it is not necessary to remesh, because the groups of the entities didn't change.



----- Original Message -----
From: 淑红 mailto:shuhong_tan at yahoo.cn
To: gidlist at listas.cimne.upc.edu
Sent: Wednesday, March 09, 2011 6:02 PM
Subject: [GiDlist] Re: Boundary condition


Thank yo for your reply.

It is too difficult to apply the boundary condition directly to the mesh when the project is complicated.

what is 'compass toolkit' you referred to? is it the problemtype 'Lsdyna'? how does the group work?

Today, I tried another way. I exported the gid mesh as a ''.msh' file after I created a mesh.
When I change the bounday condition, I erase the old mesh and import the file that I export. Why does it make no difference? The file that I import in should be considered ad the new mesh, isn't it?

Hoping for your reply.

Regards.

Shuhong Tan




--- 11年3月9日,周三, gidlist-request at listas.cimne.upc.edu gidlist-request at listas.cimne.upc.edu 写道:



发件人: gidlist-request at listas.cimne.upc.edu gidlist-request at listas.cimne.upc.edu
主题: GiDlist Digest, Vol 9, Issue 1
收件人: gidlist at listas.cimne.upc.edu
日期: 2011年3月9日,周三,下午7:00


Send GiDlist mailing list submissions to
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You can reach the person managing the list at
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When replying, please edit your Subject line so it is more specific
than "Re: Contents of GiDlist digest..."


Today's Topics:

1. boundary condition (??)
2. Re: boundary condition (Enrique Escolano)


----------------------------------------------------------------------

Message: 1
Date: Tue, 8 Mar 2011 22:30:51 +0800 (CST)
From: ?? shuhong_tan at yahoo.cn http://cn.mc158.mail.yahoo.com/mc/compose?to=shuhong_tan@yahoo.cn
Subject: [GiDlist] boundary condition
To: gidlist at listas.cimne.upc.edu http://cn.mc158.mail.yahoo.com/mc/compose?to=gidlist@listas.cimne.upc.edu
Message-ID: 632563.60352.qm at web15806.mail.cnb.yahoo.com http://cn.mc158.mail.yahoo.com/mc/compose?to=632563.60352.qm@web15806.mail.cnb.yahoo.com
Content-Type: text/plain; charset="utf-8"

Dear Gidlist,
?
I have a question about boundary condition.
?
I have a mesh already, with boundary condition and material parameters. Now, I'd like to change the boundary condition without remeshing. Is there some way to do this? Or how can I define different boundary conditions to one mesh?
?
Thank you very much. I 'm looking forward for your reply.
?
Shuhong Tan



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Message: 2
Date: Tue, 8 Mar 2011 16:39:51 +0100
From: "Enrique Escolano" escolano at cimne.upc.edu http://cn.mc158.mail.yahoo.com/mc/compose?to=escolano@cimne.upc.edu
Subject: Re: [GiDlist] boundary condition
To: gidlist at listas.cimne.upc.edu http://cn.mc158.mail.yahoo.com/mc/compose?to=gidlist@listas.cimne.upc.edu
Message-ID: 3E1710963A544BA5A77E4D8DDA9AF81C at mediador
Content-Type: text/plain; charset="utf-8"

If you change only the values of the materials , remeshing is not necessary, because the entities will point to the same updated material,
but if you change the conditions applied to the geometry it is necessary to remesh to have the new conditions applied over the mesh
(you can apply also directly conditions to the mesh, but is is unrecommended, and probably the selection will be very difficult)

If your problemtype were created using the 'compass toolkit', the conditions are applied over 'groups', and it is possible to change some condition values without need to create again the mesh, because the 'groups of the mesh' remain unchanged

Regards

Enrique
----- Original Message -----
From: ??
To: gidlist at listas.cimne.upc.edu http://cn.mc158.mail.yahoo.com/mc/compose?to=gidlist@listas.cimne.upc.edu
Sent: Tuesday, March 08, 2011 3:30 PM
Subject: [GiDlist] boundary condition


Dear Gidlist,

I have a question about boundary condition.

I have a mesh already, with boundary condition and material parameters. Now, I'd like to change the boundary condition without remeshing. Is there some way to do this? Or how can I define different boundary conditions to one mesh?

Thank you very much. I 'm looking forward for your reply.

Shuhong Tan




------------------------------------------------------------------------------


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