Elmer Discussion Forum

Hello,

I am looking to replicate the cantilever beam model in Elmer. The loads are edge loads (picture attached). There was no option for edge (or line) loads in Linear Elasticity Solver. How should I proceed?

Thanks for any information you can provide.

- Anjali

Hi,

It should be possible to give distributed loads on edges if these edges have been identified by group numbers in the mesh file mesh.boundary. In a 3D model one often lists only the faces which make the boundary of the 3D body, but additionally some edges may be listed as well. The keyword "Force i" may then be given to specify a distributed load for a specific set of edges. Here the keyword "Force i" may be considered to be misleading as it actually refers to distributed loads.

-- Mika

Depending on how you made the mesh and how you translated it to ElmerGUI, edge elements, if created by the mesher, can be retained or removed in translation.

Example a solid model in salome will mesh voluimes, faces and, edges
but a
ElmerGrid 8 2 mesh -autoclean

will suppress the edge elements.

Kevin

You could also just load the end face. The face load would be load per area, so you would have to set the force accordingly. You should get the same moment, stress, and deflection.

Kevin

Thank you. I will give that a try.

Hello,

I have done a Mesh in Salome in which I have create groups of 1 volume, 1 face and 2 edges.
I export the mesh in .unv
I can load it in the Elmer GUI but in the boundary condition selection window, I have only access to 2 boundaries. I don't know to which boundaries it correspond clearly (I try the numbering features inside the GUI but when it is on 3D geometry I don't see anything).
What is the correct procedure to export Mesh .unv to Elmer GUI and have access to boundaries ID corresponding to groups previouly defined in Salome Mesh module ?
Is it possible to have access to egdes ID in GUI or only directly in sif file ?

Julien

I have done ElmerGrid 8 2 Mesh_1.unv

-> Impossible to load the mesh ElmerGUI crashes

ElmerGrid 8 2 Mesh_1.unv -autoclean

-> possible to load mesh but no the 2 boundaries are still here in the GUI, no edges or the boundary defined in Salome

I believe the -autoclean option deletes the edge elements in a 3D model.

-removelowdim : remove boundaries that are two ranks lower than highest dim
-removeunused : remove nodes that are not used in any element
-bulkorder : renumber materials types from 1 so that every number is used
-boundorder : renumber boundary types from 1 so that every number is used
-autoclean : this performs the united action of the four above

autoclean includes -removelowdim : remove boundaries that are two ranks lower than highest dim
which removes the edge elements in a 3d model

you could do
ElmerGrid 8 2 Mesh_1.unv -removeunused -bulkorder -boundorder
to keep the edge elemets.