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April 28, 2013, 14:29 |
Cannot mesh with cooper scheme
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#1 |
Senior Member
Rick
Join Date: Oct 2010
Posts: 1,016
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Hi!
I have to mesh the domain you can see in the attached pictures, with full hexa. It id a "double helical coil" immersed in an aluminum block". The domain is composed by 4 volumes. I successfully meshed faces and I wanted to mesh the each volume with the cooper scheme, but gambit returns: "Volume cannot be meshed because two sets of source faces which form natural starts for the projections could not be found." I don't understand, in my opinion the 2 sources are of (bottom and top).. What's wrong? Thank you, Daniele |
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April 29, 2013, 01:37 |
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#2 |
Super Moderator
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
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try to split the volume along (yz)
Instead of 180° rotation volume, you will have 2x 90° (it may help).
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In memory of my friend Hervé: CFD engineer & freerider |
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April 29, 2013, 03:30 |
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#3 | |
Senior Member
Rick
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Quote:
I managed to split each of the 4 volumes into different volumes by projecting the spiral edges on the top/bottom surfaces and mesh them with hex submap. I think of meshing the central zone of the domain with map, but I have too coarse regions in that zone, so the only solution I find is to split each of these zones into "3" volumes, assign fluid names and refine them directly into fluent: do you think is it acceptable (see sketch in the picture)?. Thank you, Daniele |
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April 29, 2013, 03:55 |
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#4 |
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Maxime Perelli
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-Are you now able to mesh the volumes, which gave you problem?
-can you refine non-tetrahedral zones in fluent?
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In memory of my friend Hervé: CFD engineer & freerider |
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April 29, 2013, 03:59 |
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#5 | |
Senior Member
Rick
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Yes, now problem is solved; all volumes are meshed with hexa; my doubts are about the central zone(s).
Quote:
Thanks, Daniele |
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May 1, 2013, 09:23 |
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#6 |
Senior Member
Rick
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Dear all, dear Max,
my idea does not work very well... For completeness I can say that fluent let you refine hexa mesh (see attach image): the cube is splitted into 8 regions and refined different times; when refining 2 times fluent automatically adds refining to adjacent zones, in other word you can have adjacent cells (edges) smaller/greater than 50%/200%. As I wrote I was successfully in meshing "peripheral volumes" with hexa, but my problem remains at the center of the spiral; any comments on splitting the central volume is welcome. Daniele |
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May 2, 2013, 02:05 |
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#7 |
Super Moderator
Maxime Perelli
Join Date: Mar 2009
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Hello Daniele,
Once you are sure that your "already meshed volumes" are hexa-meshable, I would delete those mesh, and I would start meshing the center of the spiral. If you don't have any meshed volume, then you are "free" with hexa-start-meshing. Once the center of spiral is meshed, you won't have any problem to mesh the rest (but I think you already know that). Regarding decomposition, maybe you could post a picture with only the center of the spiral (shaded mode on), to see more details.
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In memory of my friend Hervé: CFD engineer & freerider |
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May 2, 2013, 02:48 |
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#8 | |
Senior Member
Rick
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Quote:
I'm attaching directly the dbs file, with part of geometry (center + adjacent volume): volumes to be problematic for me are volume 49 and 63. Here the dbs: http://www45.zippyshare.com/v/47192229/file.html Thank you, Daniele |
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May 2, 2013, 09:37 |
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#9 |
Super Moderator
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
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Hello Daniele,
I don't have time enough to really test and mesh your geometry, but did you try such a decomposition? The "Y" could be more reproduced, if your mesh get coarser. For volumes 49 & 63, you will have to split them with plane parallel at (xz) with y-offset 10.334201 (you already have some points at this level) Sans titre.png
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May 2, 2013, 09:57 |
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#10 | |
Senior Member
Rick
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Quote:
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