Mesh reflection to obtain perfectly symmetric grid
Hello everybody,
Is anyone able to give me some advice on this? Thank you very much in advance |
What type of errors?
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Do you try to merge the blocking or the mesh ?
Because you can rotate your blocking and avoid to merge two meshes. Anyway, if you merge two meshes, be careful to the mesh law of your edges. Because if you specified a "geometric 1" law on one edge of your symmetry plane, you would have issues to merge the 2 meshes once you have make a symmetry of your mesh 1. The edge of your mesh 1 would have to be merged with the same edge of your mesh 2, but with the symmetry operation, the orientation of your edge would have changed. And with a geometric 1 law, the nodes on those edges won't be aligned anymore ! |
Are you mirroring the blocking or just the mesh? If it is topologically symmetrical, but not geometrically symmetrical, you should mirror the blocking and then adjust to fit the actual geometry... But if it is geometrically symmetrical, you can just mirror the mesh, then merge nodes with a tolerance and delete the symmetry shells.
I don't think you should have a problem with your mesh distribution laws (as BroleY was talking about) if you mirror, but only if you copy rotate by 180 (which I hope is not what you are doing). For more help than this, you will need to tell us what the errors were. |
Thanks everybody for your interest and your help,
Thank you again! |
When you mirrored the mesh, you have a duplicate symmetry plane. You need to merge nodes with a tolerance (set to something very small like 1% of you mesh size) and then delete the elements in your symmetry part.
Then run your checks again and you should be fine. Yes, other issues deserve other threads... |
Ok I am doing this, thank you so much.
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As i have almost the same problem how do i delete the symmetric shell? i already chose the option of merge nodes and delete duplicated elements while using the mirror option? is this not enough and what should i do more to get rid of multiple edges and non-manifold vertices. thank you very much
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Assuming the symmetric shell is in a unique part name (such as "SYMM") you can turn off all the other parts and just delete the elements.
There are a bunch of element selection options, so if you don't want to drag a box to select, you could delete visible or delete by part or draw a polygon around the elements you want to delete. This will just delete the shells and not the volume elements on either side. |
I usually run a mesh check for duplicated elements, I fix it by clicking delete. and When exporting, I define the rest as interior.
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Yup that works too... And by keeping those shells as interior, you can more easily post process on them.
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