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June 25, 2013, 21:58 |
faces are missorinted.. repair holes
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#1 |
Senior Member
mohamed khedr emam
Join Date: Oct 2011
Location: Egypt
Posts: 121
Rep Power: 14 |
Dear experts, I have a small problem , it took long time for solving and i couldn't solve it When I run the mesh ( Tetra, unstructured and Robust (octree) meshing techniques) a massage appeared in monitored screen "faces are missorinted" and then ICEM show me "repair holes" massage box "image1" Notes: 1-There is no holes in my geometry (it a single blade inside a big 120o enclosure sector) and i am also run "repair geometry" before 2-The zone where the problem originates is >> a common edges between two couple of surface "image2" 3- I searched in cfd-online search for " faces are missorinted" but I found only one thread and it was useless for me Finally, I attached the Icem file Thanks in advance
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June 27, 2013, 00:24 |
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#2 |
Senior Member
mohamed khedr emam
Join Date: Oct 2011
Location: Egypt
Posts: 121
Rep Power: 14 |
Any help pls.
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June 27, 2013, 07:51 |
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#3 |
Senior Member
Join Date: Feb 2013
Location: Germany
Posts: 200
Rep Power: 24 |
- set proper mesh sizes on all surfaces or parts, especially in the hub region
- delete all points and curves permanently - run "Build Diagnostic Topology" with the default value it gives you - set curve sizes (this is not a must) - then run octree again Edit: When defining intersecting thin cuts, remember to have the curve between the two parts in another part. |
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June 27, 2013, 11:26 |
Answer
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#6 |
Member
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As Ali said it seems that that surface was a problem, but by inactive/active that surface, the problem is gone!
One of the edges is not associated well. I chose build up topology of 0.001 and it was corrected. I then run Octree mesh. There was no problem. I use Ansys v14.5. Last edited by sadjad.s; June 27, 2013 at 11:45. Reason: Correction |
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June 27, 2013, 11:42 |
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#7 |
Senior Member
Join Date: Feb 2013
Location: Germany
Posts: 200
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I think there is no actual hole in the geometry. The problem may occur from topology and inproper mesh sizes. Try my suggested method, it works. I have attached the corrected files. Now, just set more mesh sizes to capture every detail of your geometry.
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July 9, 2013, 06:52 |
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#9 | ||
Senior Member
mohamed khedr emam
Join Date: Oct 2011
Location: Egypt
Posts: 121
Rep Power: 14 |
Quote:
I tried this method But it didn't work also Then i tried the 2nd method you stated it (below) Quote:
thanks again |
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July 9, 2013, 06:56 |
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#10 | |
Senior Member
mohamed khedr emam
Join Date: Oct 2011
Location: Egypt
Posts: 121
Rep Power: 14 |
Quote:
i tried many times to separate them in fluent but i failed (On the contrary, merge is an easy process in fluent) thanks again |
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July 9, 2013, 09:45 |
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#11 |
Senior Member
Join Date: Feb 2013
Location: Germany
Posts: 200
Rep Power: 24 |
Wait, I think i found a hole in the geometry. There is a short gap between pressure and suction side of the blade. Octree does not mind the gap as long as elements are big enough.
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July 9, 2013, 10:05 |
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#12 |
Senior Member
mohamed khedr emam
Join Date: Oct 2011
Location: Egypt
Posts: 121
Rep Power: 14 |
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July 9, 2013, 10:23 |
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#13 |
Senior Member
Join Date: Feb 2013
Location: Germany
Posts: 200
Rep Power: 24 |
In ICEM it is very hard to fix. First you could go back to your CAD tool and try to fix it. Or try another exchange format.
You can also reverse the normal process. You can extract geometry from an existing mesh. I gave it a short try and it worked. Not all areas are good. So you could develope a mesh with your old geometry that, - closes the gap - represent other geometry well and then extract new geometry from this mesh. |
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July 9, 2013, 10:52 |
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#14 | |
Senior Member
mohamed khedr emam
Join Date: Oct 2011
Location: Egypt
Posts: 121
Rep Power: 14 |
Quote:
Anyawy I will try other exchange format, thanks Kad |
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July 9, 2013, 11:09 |
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#15 |
Senior Member
Join Date: Feb 2013
Location: Germany
Posts: 200
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I think it is possible to export solidworks geometry directly from solidworks to Designmodeler and from there to ICEM via workbenchreader. Maybe you have to adjust your CAD configuration manager. Check this video:
http://www.youtube.com/watch?v=6yyPC9gXZZ8 Or you can only use the workbenchreader in ICEM for solidworks data. This should be somehow more "lossless" because you avoid converting back and forth. |
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July 29, 2013, 00:11 |
Error appears again
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#16 |
Senior Member
mohamed khedr emam
Join Date: Oct 2011
Location: Egypt
Posts: 121
Rep Power: 14 |
Hi, All
I forced to change the mesh size specially on blade surface (for accurate mesh presentaion on Fluent and hence accurate results) , So Massage appears again "repair holes" if i press YES a internal screen massage of "faces are missorinted" However i upload the new ICEM file (http://www.4shared.com/rar/0WbPTjkJ/Gometry.html) , I ask for a definitive solution for this problem Thanks in advance |
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July 29, 2013, 11:10 |
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#17 |
Senior Member
mohamed khedr emam
Join Date: Oct 2011
Location: Egypt
Posts: 121
Rep Power: 14 |
I forgot to say that i'm tired all the above ways to avoid the problem BUT the error still continue
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