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groups not available for BC's

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14 years 2 months ago #4083 by Dave
groups not available for BC's was created by Dave
hello, i am trying to set up an analysis using the linear elasticity wizard as a starting point.

i am unable to access 2 of the groups i created to apply BC's on.

they are edges, i created them by partitioning my solid object with a plane choosing "edge" as the result of the partition. i then create a group within the partition object since i cannot select the edge with the solid object as my main shape, the lines are not on that object.

when i use the wizard i select my solid object, but since my edge groups belong to the partition i created i am not seeing them in the pulldown menu, rather i only see those groups that i created based on the solid object. since my edge parition is not a solid object i cannot use it as the input on the wizard.

any advice on how to apply boundaries on these edges would be very helpful. thanks in advance.
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14 years 2 months ago #4084 by Claus
Replied by Claus on topic Re:groups not available for BC's
Not entirely sure if I got this right; once you've partitioned a solid and you have a new resulting solid with the 'extra' edges, you need to create groups for the edges to be able to select them in either the mesh module or the aster_wizard.

My work flow is usually: create solid, partition if needed, create groups on the geometry (node, edge or face) -> mesh the solid, create (import) groups from the geometry -> create the study in Aster_wizard with 3D- 'working on mesh'

Hope that help, otherwise try again :)

/C

Code_Aster release : STA11.4 on OpenSUSE 12.3 64 bits - EDF/Intel version
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14 years 2 months ago #4085 by Dave
Replied by Dave on topic Re:groups not available for BC's
thanks for the comment.

the resulting shape is not actually a solid for some reason. i am creating groups but they are under the partition object which unfortunately is not a solid.

what did you mean by import groups in the mesh module?

thanks
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14 years 2 months ago #4088 by Claus
Replied by Claus on topic Re:groups not available for BC's
Dave wrote:

thanks for the comment.

the resulting shape is not actually a solid for some reason. i am creating groups but they are under the partition object which unfortunately is not a solid.

what did you mean by import groups in the mesh module?

thanks


The result from partitioning a solid should be a new solid, otherwise you're doing something wrong. Almost every operation you perform on something in Salomé results in a new object.

I made a small example you can follow just to get you started:

I created a box and created a plane. I translated (moved) the box which results in a new object called Translation_1. I partition Translation_1 with Plane_1 resulting in a new solid: Partition_1. On Partition_1 I create the groups facegroup and Edgegroup.

Start the mesh module, create new mesh using Partition_1 as the geometric object. Once that is calculated and created, I right click Mesh_1 and select 'Create groups from geometry' and I select the groups from the geometric object Partition_1

It is annoying that Salomé creates a new object every time you perform an operation on something, but that's just the way it is<br /><br />Post edited by: Claus, at: 2010/04/07 10:42

Code_Aster release : STA11.4 on OpenSUSE 12.3 64 bits - EDF/Intel version
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14 years 2 months ago #4089 by Claus
Replied by Claus on topic Re:groups not available for BC's
And the file (God damn you Joombla board :angry: )

Attachment Study1-754e19ac52f4d454b9e3c701ff53a54c.zip not found


Code_Aster release : STA11.4 on OpenSUSE 12.3 64 bits - EDF/Intel version
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14 years 2 months ago #4093 by Dave
Replied by Dave on topic Re:groups not available for BC's
thanks again claus. this is very helpful.

there must be something strange going on since i cannot select 3D mesh on my resulting partition object, i am only allowed 1D mesh by the popup menu. the part is definitely a solid and i am only using a plane to partition it. i am selecting edges as the resulting structure since i only want edges added to my solid. i imagine this is my problem.

actually, it looks like i am able to create a 3D mesh on a partition if i use the 2nd partitioning method. what are the differences between those 2 methods.

also i have a question about partitioning a face on a solid. i am only interested in getting 2 lines on a face but not cutting the entire solid as that would lead to very poor element structure once meshed. i have partitioned a defined face &quot;group&quot; but that results in a new partition that is definitely not a solid. so is it possible to add edges to just one of the faces of the solid and still get out a solid with all subsequent partitioning entities available for mesh groups?

thanks again.
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