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[GAMBIT] How to mesh this entity with sharp corner?SOS! |
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May 18, 2011, 22:52 |
How to mesh this entity with sharp corner?SOS!
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#1 |
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J.G.Wang
Join Date: May 2011
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Dear Everybody, I'm now meshing a volume which has pointed corner as shown below, the skewness of tens of elements will always be higher than 0.97 after meshing first line then face then volume.No matter how i move the points on the face manually, it can not show a good quality. a guy told me since there're two connected lines ending up to a tangent profile, no way the quality of this face will be improved too much. Is that true?
Another problem is, after moving grids on the face, the equisize skewness of the face will be improved from 0.983 to 0.968, so gambit shows no error or warning. but i import the mesh file to the fluent and smooth and use case check, it told me the skewness exceed 0.98 in 5 elements thread id is 2. That's why?Haven't I lower the skewness to 0.96? I'm waiting for your kind helps. 2011-05-19_101308.jpg 2011-05-19_101216.jpg 2011-05-19_101402.jpg |
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May 19, 2011, 01:58 |
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#2 |
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Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
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avoid having sharp angle.
In your case, I think you need to delete it. Split your geometry short before the sharp angle, and delete the volume containing the sharp angle. Sans titre.png
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May 19, 2011, 02:56 |
thank you!
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#3 | |
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J.G.Wang
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Quote:
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May 19, 2011, 03:02 |
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#4 |
Super Moderator
Maxime Perelli
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I don't think it will affect the solution, since this is not an high velocity or pressure-gradient.
Anyway you won't be able to get an acceptable mesh if you don't fix it
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May 19, 2011, 04:45 |
Thank you.
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#5 |
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J.G.Wang
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Thanks a lot for your quick reply and guidance. I'll try fixing it with this method. thank you again, -mAx-!
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May 25, 2011, 01:32 |
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#6 |
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J.G.Wang
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May 25, 2011, 01:32 |
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#7 |
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J.G.Wang
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May 25, 2011, 01:57 |
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#8 |
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Maxime Perelli
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if the topology remains, the mesh has to follow it( especially at boundary egde/surface).
And it is indepedant from the kind of mesh you will use In other words you will still have problem at the corner
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In memory of my friend Hervé: CFD engineer & freerider |
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May 25, 2011, 09:37 |
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#9 | |
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J.G.Wang
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May 25, 2011, 09:54 |
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#10 |
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Maxime Perelli
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merge it with the volume, which is tangential to sharp angle.
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In memory of my friend Hervé: CFD engineer & freerider |
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May 25, 2011, 10:05 |
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#11 |
New Member
J.G.Wang
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well, merging them doesn't help anything, the sharp corner can't be avoided.2011-05-25_220245.jpg
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May 26, 2011, 10:23 |
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#12 |
Super Moderator
Maxime Perelli
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For instance you can do an extrusion of your volume 8 in x-direction (<0).
More in details: sweep surface.6 with (-0.1 0 0). Then unite volume 8 with the new one. And you don't have your sharp corner
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In memory of my friend Hervé: CFD engineer & freerider |
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May 26, 2011, 11:10 |
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#13 |
New Member
J.G.Wang
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I know what you mean, thank you very much! Hope it will not affect the solution. You've helped me so much indeed.
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