unwanted connection between coincident nodes?

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  • Last Post 2 weeks ago
derd3 posted this 2 weeks ago

Hi

I'm simulating a bunch of independent beams which intersect from time to time. Neither is any coupling of the beams done manually nor is it desired.

I now get triangles between independent beams, if I plot the total nodal displacement. If for example the element axial stress is ploted the triangles are gone => I wonder whether this has an impact on the result or is just a graphics error?
If it is impacting the results, the question would be how to get rid of these connections.

Thanks and regards

strange_trianlges

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SandeepMedikonda posted this 2 weeks ago

This is indeed strange. Can you try picking the mesh nodes at that location and querying them for their locations? Also, picking the mesh nodes at that location to see if it is one node or two is one way you can test it.

Lastly, what version are you using? can you test in another version or the latest one even (v19.2)?

Regards,
Sandeep
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derd3 posted this 2 weeks ago

Hi Sandeep

I'm currently running the version 17.2. I will run it on the latest version as well.

 

I selected only few elements for better visibility and checked that no colinear beam elements are present, so there are no "hidden elements".

At this subgrid point I can select 3 entities, all exactly at the same global location and equal displacement values.

at this point even 4, again all having the same location

It displays the following shortly after displaying the SOLUTION OPTIONS, maybe it corelates.

 *** NOTE ***                            CP =      44.547   TIME= 17:23:45
 Internal nodes from 8396 to 17056 are created.                         
 3592 internal nodes are used for non-contact elements with mixed       
 formulation.                                                           
 5069 internal nodes are used for quadratic and/or cubic options of     
 BEAM188, PIPE288, and/or SHELL208.                                     

thanks for the fast response, regards

derd3 posted this 2 weeks ago

hi Sandpeed
tried it with the newest version, still happens.

regards

derd3

SandeepMedikonda posted this 2 weeks ago

derd3, I have reached out to the development team and will update you here when they reply back.

Also, what university are you working from? If we need to look into your model, we will reach out to you via your account manager.

Regards,
Sandeep
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derd3 posted this 2 weeks ago

Thanks! I'm studying at the ETH Zurich.
regards
derd3

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