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Trouble with snappy and boundary layers

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Old   April 28, 2009, 11:15
Question Trouble with snappy and boundary layers
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David
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Hi!

I have a problem with boundary layer addition producing strange "blobs" on edges of the geometry. The snapping works well but the "blobs" appear after adding layers.
I'm attaching images from the stl file and from the snapping procedure, both with and without BL.
I have also attached blockMeshDict and snappyHexMeshDict.
We have managed to produce more complicated meshes before with these settings and the .stl file seems to have high quality??

Unfortunately the mesh is quite large (5M cells).

Platform:
linux64

Version:
1.5.x

Thanks
Attached Images
File Type: jpg blob.jpg (53.0 KB, 173 views)
File Type: png stl.png (91.1 KB, 142 views)
File Type: jpg no_BL.jpg (93.8 KB, 153 views)
Attached Files
File Type: gz dicts.tar.gz (4.8 KB, 15 views)
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Old   April 30, 2009, 06:05
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Wolfgang Heydlauff
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hi kellard,

yes, this problem is very well known here. there is no chance to "smooth" the surface from those blobs. i think you have to wait till the new OF version comes out and brings the new snappyhexmesh with the featureEdgeLines tool.
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Old   April 30, 2009, 07:56
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David
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Thanks Wolfgang for your replay. Do you know why the blobs appear? Can I avoid them?
Thanks again!
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Old   April 30, 2009, 09:16
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Wolfgang Heydlauff
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hi kellard,

no sorry, no idea. i have to live with it. actually I am moving on to another (commercial) mesher that meshes geometries mainly automatically with full control influence of me. it also creates a nice boundary layer. It can do hex and prism BL. and it is not that expensive (like gridgen e.g.). its called castnet.
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Old   April 30, 2009, 09:25
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David
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Hi Wolfgang
ok, thanks for helping me. Maybe I do the same and take a look at that commercial mesher.
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Old   January 12, 2011, 10:27
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Hi,

I have some strange problems with layer generation in snappyHexMesh. Would be great, when somebody knows how to face the problem.

I attached a photo and my snappyHexMeshDict below.

Thanks in advance!

Daniel
Attached Images
File Type: jpg layer.jpg (100.7 KB, 57 views)
Attached Files
File Type: gz snappyHexMeshDict.tar.gz (3.4 KB, 4 views)

Last edited by DanielPT; January 12, 2011 at 12:14.
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