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Problem with patches/cells on edge with multi-region mesh

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Old   September 8, 2015, 04:39
Default Problem with patches/cells on edge with multi-region mesh
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Vineet Bhola
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Hi Guys,
I am working with a multi-Region mesh with a gas as a cylindrical volume surrounded by a solid container. The boundary seems smooth and fine but only around the edge of clinder, there are some cells which should have belonged to the other side of the boundary.
You can see there are 5 patches of solid written into abgas boundary and 3 from gas written into solid.
I am attaching rest of the pics and the scripts in the comments below.
Thanks
Vineet
Attached Images
File Type: png abgas_boundary.png (57.8 KB, 14 views)
File Type: png solid_boundary.png (72.3 KB, 9 views)
File Type: png edges_abgas.png (29.5 KB, 9 views)
File Type: jpg abgas_zoom_2.jpg (80.1 KB, 11 views)
File Type: jpg abgas_edge_zoom.jpg (51.6 KB, 10 views)
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Old   September 8, 2015, 04:44
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Vineet Bhola
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Here are the pics of solid and scripts. (I had it compressed as .rar and changed the Format to .zip. I am not sure if that works fine)
Attached Images
File Type: png solid_edge.png (117.3 KB, 9 views)
File Type: png solid_edge_zoom.png (129.1 KB, 10 views)
File Type: png solid_zoom3.png (67.9 KB, 9 views)
Attached Files
File Type: zip solid_wasser_abgas.zip (190.2 KB, 4 views)
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Old   September 30, 2015, 03:27
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I have found a probable reson for this problem. I am attaching the ouput of
Code:
checkMesh -region solid -latestTime -allGeometry
The problem is with concave cells. When I had tried using only checkMesh, there was no error. This error is displayed only when I use the option -allGeometry.

Quote:

Checking geometry...
Overall domain bounding box (-0.04104272 -15.99586 -15.99162) (160.0614 15.99611 40.01314)
Mesh (non-empty, non-wedge) directions (1 1 1)
Mesh (non-empty) directions (1 1 1)
Boundary openness (-6.154302e-18 2.835071e-16 9.963069e-17) OK.
Max cell openness = 3.552997e-16 OK.
Max aspect ratio = 3.347224 OK.
Minumum face area = 0.03610225. Maximum face area = 0.5895355. Face area magnitudes OK.
Min volume = 0.02714029. Max volume = 0.2204492. Total volume = 26158.94. Cell volumes OK.
Mesh non-orthogonality Max: 39.08594 average: 7.384726
Non-orthogonality check OK.
Face pyramids OK.
Max skewness = 2.687109 OK.
Coupled point location match (average 0) OK.
Face tets OK.
Min/max edge length = 0.09569972 1.110831 OK.
*There are 20 faces with concave angles between consecutive edges. Max concave angle = 73.34795 degrees.
<<Writing 20 faces with concave angles to set concaveFaces
Face flatness (1 = flat, 0 = butterfly) : average = 0.9998826 min = 0.8739291
All face flatness OK.
Cell determinant (wellposedness) : minimum: 0.3037543 average: 3.546978
Cell determinant check OK.
***Concave cells (using face planes) found, number of cells: 12578
<<Writing 12578 concave cells to set concaveCells

Failed 1 mesh checks.
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Old   September 30, 2015, 05:22
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Has anyone faced a similar problem before? It seems like I am talking to myself. I just speculate that it was the reason...I have not found any solution (Infact not even sure concave faces/cells are really creating the problem)
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Old   October 6, 2015, 05:12
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Hi Vineet,

Can we have a look at your snappyHexMeshDict ?
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Old   October 16, 2015, 03:34
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you can check out the whole case Folder in the attachment file. Blockmeshdict and Snappyhexmeshdict are in there
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