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[ICEM] Mesh reflection to obtain perfectly symmetric grid |
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September 15, 2011, 14:33 |
Mesh reflection to obtain perfectly symmetric grid
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#1 |
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Charles de Luzan
Join Date: Jun 2010
Location: Cincinnati, OH
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Hello everybody,
Is anyone able to give me some advice on this? Thank you very much in advance |
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September 15, 2011, 21:41 |
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#2 |
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Bruno
Join Date: Mar 2009
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What type of errors?
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September 16, 2011, 03:50 |
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#3 |
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AB
Join Date: Sep 2009
Location: France
Posts: 323
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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 ! |
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September 16, 2011, 10:11 |
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#4 |
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Simon Pereira
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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.
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September 21, 2011, 17:54 |
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#5 |
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Charles de Luzan
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Thanks everybody for your interest and your help,
Thank you again! |
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September 21, 2011, 20:18 |
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#6 |
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Simon Pereira
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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...
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September 22, 2011, 12:00 |
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#7 |
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Charles de Luzan
Join Date: Jun 2010
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Ok I am doing this, thank you so much.
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December 11, 2014, 06:47 |
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#8 |
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Ahmed El-Sawi
Join Date: Nov 2014
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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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December 11, 2014, 10:04 |
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#9 |
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Simon Pereira
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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.
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December 11, 2014, 10:22 |
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#11 |
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Simon Pereira
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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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Tags |
3d mesh, icem cfd, merge, reflection, symmetry |
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