Crossed Edges in so...
 
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Crossed Edges in solid sphere

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Error_man
Posts: 7
Topic starter
(@error_man)
Active Member
Joined: 2 years ago

Hi,

In my analysis there is a solid sphere meshed with 10 noded tetrahedron elements. I chose elform 16 in section.  When i check the sphere on contact check>by parts, it gives me 46 crossed edges around the surface (The model look okay though). I tried flipping the nodes but it just made it worse. There is a slight difference between real result and my result and I was hoping this might cause it. However, i dont know neither if it is nor how to correct it. Any advices?

Thanks

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5 Replies



Massoud
Posts: 23
(@mass)
Eminent Member
Joined: 2 years ago

I am not so knowledgeable but I think it can not be reason.

Please leave a screen shot when you are saying:" When i check the sphere on contact check>by parts, it gives me 46 crossed edges around the surface" to let guys help.

don't flip it.

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Error_man
(@error_man)
Joined: 2 years ago

Active Member
Posts: 7

Hi @mass,

Here is the screenshot. In LS Dyna support site, it says it might lead to severe problems. That' why i thought it might be.

https://www.dynasupport.com/howtos/ls-prepost/find-and-remove-initial-penetrations

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Negative Volume
Posts: 554
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(@negativevolume)
Honorable Member
Joined: 4 years ago

@error_man How did you create the sphere? It sounds like you are dealing with a duplicate node issue, meaning adjacent nodes are not connected but have their own nodes which are crossing. 

Do you know how to find and merge duplicate nodes in LS-PrePost?

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Error_man
(@error_man)
Joined: 2 years ago

Active Member
Posts: 7

@negativevolume Yes i had already checked the duplicated nodes. I created the sphere as        auto mesh> shell sphere> tetra mesh. After all Ls dyna software engineer contacted me and it turned out to be a bug. He said it'll be fixed for the next update.

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Negative Volume
Admin
(@negativevolume)
Joined: 4 years ago

Honorable Member
Posts: 554

@error_man okay perfect!

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