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-   -   Trouble with snappy and boundary layers (http://www.cfd-online.com/Forums/openfoam-meshing-snappyhexmesh/64073-trouble-snappy-boundary-layers.html)

kellard April 28, 2009 11:15

Trouble with snappy and boundary layers
 
4 Attachment(s)
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

wolle1982 April 30, 2009 06:05

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.

kellard April 30, 2009 07:56

Thanks Wolfgang for your replay. Do you know why the blobs appear? Can I avoid them?
Thanks again!

wolle1982 April 30, 2009 09:16

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.

kellard April 30, 2009 09:25

Hi Wolfgang
ok, thanks for helping me. Maybe I do the same and take a look at that commercial mesher.

DanielPT January 12, 2011 10:27

2 Attachment(s)
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


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