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[blockMesh] Wedge-shaped block: Problem with skew faces

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Old   October 23, 2014, 15:55
Default Wedge-shaped block: Problem with skew faces
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Hi there,

I've created a mesh of a Wave Channel using wedge-shaped blocks. In the attached pictures you can see the geometry of the whole domain, the blockMeshDict and the error message of the checkMesh utility.

I think the nonOrthoFaces shouldn´t be a problem.

Can I also ignore the zeroAreaFaces as it's normal to have zeroAreaFaces in a wedgeshaped block? The Tutorial states these block faces would be assigned to a patch, which then can be seen as a patch with no faces in the boundary file. But there is no such patch in the boundary file for my case.

Also checkMesh detects two skewFaces. I've looked at them with ParaView and they are on the downside face of the wedge-shaped block (the ZeroAreaFace) left side of the structure. (see the red line on the attached zoomed-in picture)

I'm wondering:

  1. Why does the problem only appear on the left side? (To me it seems to be a quite symmetric setup.)
  2. How can I get rid of these skewFaces?
  3. How do they affect my calculations? However the simulations seem to run pretty good, the only thing is that they exit after about 90s (I wanted to simulate 100s), but I'm not sure if this isn't due to other problems at the boundaries...
I´m sure someone here has more experience with wegde-shaped blocks and easily sees the problem/mistake. I would appreciate to get any help and more clarity on this! And thanks a lot for taking the time to read my post. ;-)
Attached Images
File Type: jpg sketchGeometry.jpg (11.0 KB, 57 views)
File Type: jpg zoom.jpg (41.0 KB, 69 views)
Attached Files
File Type: txt blockMeshDict.txt (2.0 KB, 14 views)
File Type: txt checkMesh error.txt (2.4 KB, 7 views)
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Old   October 28, 2014, 13:44
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Hi,

in my opinion you should avoid the wedge-shaped blocks.

Try to create your blocks as shown in the attached image. This way you will obtain a mesh consisting of real quads/hexas only.

Cutter
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Old   October 28, 2014, 13:53
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now with all the three images I created:
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File Type: jpg blocks.jpg (16.2 KB, 35 views)
File Type: jpg mesh.jpg (44.9 KB, 48 views)
File Type: jpg mesh3d.jpg (36.9 KB, 51 views)
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skew faces, wedge block, zero area faces

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