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[ICEM] Merge volume meshes Hexa-tetra with ICEM

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Old   August 20, 2013, 13:25
Default Merge volume meshes Hexa-tetra with ICEM
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Vincenzo Falcone
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Hi,
I'm a student of Polytechnic of Bari. I'm working on a 3d model using ICEM. Before posting this new thread, i read existing posts in the forum and i followed the instrunctions for solving my problem with no good results. my model is a postburner with one body which i called FLUID. In this model there are two regions with different meshes: unstructured and structured ones. Following the tutorials, i created these two meshes separately (having same size at interface), i loaded them both together (selecting merge rather than replace), and then i used the merge mesh tool at the interface. Here, I have problems with some elements at interface:
1)penetrating elements;
2)multiple edges
3) non-manifold vertices
4)unconnected vertices.
I attach these images to clarify the problem. I would to know how can i avoid these errors or can i repair them.
i hope this my exposition is clear and thanks for your attention.
Best regards
Vincent
Attached Images
File Type: jpg Immagine.jpg (98.5 KB, 44 views)
File Type: jpg Immagine2.jpg (97.3 KB, 41 views)
File Type: jpg Immagine3.jpg (59.7 KB, 32 views)
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Old   August 20, 2013, 17:35
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Ghazlani M. Ali
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for the unstructured pat, have your run a build topology ??? if i may ask: can you share the geometry ? i can take a look at it..
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Old   August 21, 2013, 04:24
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Vincenzo Falcone
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I thank you for your quick reply. First i checked Geometry and it's all ok. Then I checked the two meshes separatley before merging. For unstructured mesh there are some problems with Delauney violations; for structured one there are stand-alone surface mesh problems. I tried build topology for unstructured part after merging meshes, but it seems problems remain. As requested by you, I attach the geometry and blocking files.
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File Type: zip trapped-vortex-3d-7-geometry.zip (31.0 KB, 9 views)
File Type: zip trapped-vortex-3d-7-blocking.zip (12.9 KB, 6 views)
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Old   August 21, 2013, 12:15
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weird behavior i don't know why it behaves like that...
Why didn't you block the hole geometry ??
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Old   August 21, 2013, 12:29
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Vincenzo Falcone
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Hello diamond, do you mean why I don't use one structured mesh? because I was playing a project already done with Gambit in which there were two kinds of mesh. For licensing reasons I am forced to use ICEM but I have these problems. I tried to fix it manually by moving the nodes, but then it creates additional difficulties due to violation of the periodicity of the faces. if there are no solutions, I will be forced to adopt a single mesh.
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Old   August 24, 2013, 09:26
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after several attempts I found the solution: the model has regular faces so I should set the condition of periodicity at the vertices of the blocks for the structured mesh. I share this information hoping that it will be useful to anyone who has the same problem.
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