Strange issue in node numbering during meshing

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vpapanik
Posts: 32
Joined: Sat Oct 08, 2016 1:05 pm

Strange issue in node numbering during meshing

Postby vpapanik » Thu Mar 12, 2020 11:11 am

I have a simple 2D panel

b1wYagK.png
b1wYagK.png (19.34 KiB) Viewed 2 times

which I am meshing with quadrilateral elements.

3wuxTeh.png
3wuxTeh.png (31 KiB) Viewed 2 times

When I solve it for dead load I am getting strange results (some elements show sxx instead of syy)
because of element orientation.

tsThyLp.png
tsThyLp.png (55.08 KiB) Viewed 2 times

That means that node numbering for some elements start from the lower left corner and some of them from the
lower right corner. When I am showing the node numbering, there are some strange gaps in number sequence.

yIBej3C.png
yIBej3C.png (85.28 KiB) Viewed 2 times

I wonder if there's a way to read the correct orientation of elements in order to have correct results. I know
about normal but is there a way to check the starting node, or their local axes ?

Regards
User avatar
vpapanik
Posts: 32
Joined: Sat Oct 08, 2016 1:05 pm

Re: Strange issue in node numbering during meshing

Postby vpapanik » Thu Mar 12, 2020 8:42 pm

It seems that it has to do with the line sequence that created the surface. Is it possible to change (rotate) this sequence without having to delete the surface and create it again ?

I also don't know what SAME1ST/DIFF1ST means.

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