could not apply boundary condition on face groups

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tryphena
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could not apply boundary condition on face groups

Post by tryphena »

Hello,
I tried to do some simple test on Salome-Elmer. I could not fully use the Elmer plugin in Salome yet. Therefore, I export the mesh file to Elmer GUI for simulation.
I originally created face groups in Salome. Elmer recognizes the face groups as bodies, not boundaries. I could not apply boundary conditions to the faces. Does anyone have any clue on this? Thank you very much.
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plate2.JPG
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plate3.JPG
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kevinarden
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Re: could not apply boundary condition on face groups

Post by kevinarden »

It looks like there are no volume elements and therefore Elmer takes the face elements as bodies. Can you post the the mesh.header file?
tryphena
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Re: could not apply boundary condition on face groups

Post by tryphena »

Hi Kevinarden,
Please check the attachments. Thanks.
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plate_2.unv
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mesh.header
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kevinarden
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Re: could not apply boundary condition on face groups

Post by kevinarden »

No volume elements only triangles (type 303) and edge elements (type 202). So elmer translation takes the triangles as bodies and the edge elements as boundaries.
tryphena
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Re: could not apply boundary condition on face groups

Post by tryphena »

Hmm,I have imported stl to salome, and mesh there. And export it to elmer. Is something wrong in this approach? Do I need to do some operation in salome? Thanks....
raback
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Re: could not apply boundary condition on face groups

Post by raback »

I guess you have meshed only the boundaries, or at least saved only the boundaries. Elmer would like to have the 3D entities meshed too.
kevinarden
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Re: could not apply boundary condition on face groups

Post by kevinarden »

A stl file is only a surface not a solid, therefore you will get surface elements. Elmer will take the surface elements as bodies not boundaries unless there are volume elements included. To get volume elements you would need a solid in salome, not a surface.
tryphena
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Re: could not apply boundary condition on face groups

Post by tryphena »

kevinarden wrote: 25 Apr 2021, 03:36 A stl file is only a surface not a solid, therefore you will get surface elements. Elmer will take the surface elements as bodies not boundaries unless there are volume elements included. To get volume elements you would need a solid in salome, not a surface.
I have figured it out. Salome can build solid from STL file in geometry module. Then everything works fine. Thank you.
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