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[snappyHexMesh] Could not Add Boundary Layers near a Rectangular Channel Wall using SnappyHexMesh

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Old   July 3, 2018, 06:31
Default Could not Add Boundary Layers near a Rectangular Channel Wall using SnappyHexMesh
  #1
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Hi All,


I have been struggling with this issue for a while.



The geometry is very simple, just a rectangular channel consisting of inlet, outlet and side walls.


The castellatedMesh & snap steps were OK, only the addLayers step failed.


Many suggestions found on this site have been tried but unfortunately none of them worked, therefore I decide to put a new thread regarding this for further help.



The geometry is in stl format and pasted below:


solid channel_inlet
facet normal -1 0 0
outer loop
vertex 0 0.0005 -0.0005
vertex 0 -0.0005 -0.0005
vertex 0 -0.0005 0.0005
endloop
endfacet
facet normal -1 -0 -0
outer loop
vertex 0 -0.0005 0.0005
vertex 0 0.0005 0.0005
vertex 0 0.0005 -0.0005
endloop
endfacet
endsolid channel_inlet
solid channel_sides
facet normal 0 -1 0
outer loop
vertex 0.01 -0.0005 0.0005
vertex 0 -0.0005 0.0005
vertex 0 -0.0005 -0.0005
endloop
endfacet
facet normal 0 -1 0
outer loop
vertex 0 -0.0005 -0.0005
vertex 0.01 -0.0005 -0.0005
vertex 0.01 -0.0005 0.0005
endloop
endfacet
facet normal 0 0 -1
outer loop
vertex 0.01 -0.0005 -0.0005
vertex 0 -0.0005 -0.0005
vertex 0 0.0005 -0.0005
endloop
endfacet
facet normal -0 -0 -1
outer loop
vertex 0 0.0005 -0.0005
vertex 0.01 0.0005 -0.0005
vertex 0.01 -0.0005 -0.0005
endloop
endfacet
facet normal 0 1 0
outer loop
vertex 0.01 0.0005 -0.0005
vertex 0 0.0005 -0.0005
vertex 0 0.0005 0.0005
endloop
endfacet
facet normal 0 1 0
outer loop
vertex 0 0.0005 0.0005
vertex 0.01 0.0005 0.0005
vertex 0.01 0.0005 -0.0005
endloop
endfacet
facet normal -0 0 1
outer loop
vertex 0.01 0.0005 0.0005
vertex 0 0.0005 0.0005
vertex 0 -0.0005 0.0005
endloop
endfacet
facet normal 0 -0 1
outer loop
vertex 0 -0.0005 0.0005
vertex 0.01 -0.0005 0.0005
vertex 0.01 0.0005 0.0005
endloop
endfacet
endsolid channel_sides
solid channel_outlet
facet normal 1 0 0
outer loop
vertex 0.01 -0.0005 0.0005
vertex 0.01 -0.0005 -0.0005
vertex 0.01 0.0005 -0.0005
endloop
endfacet
facet normal 1 0 0
outer loop
vertex 0.01 0.0005 -0.0005
vertex 0.01 0.0005 0.0005
vertex 0.01 -0.0005 0.0005
endloop
endfacet
endsolid channel_outlet


Regards,


Gary
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Old   July 10, 2018, 09:06
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Just to make sure any body has an interest to help me, I have uploaded the essential files.

Thanks
Attached Files
File Type: txt blockMeshDict.txt (1.7 KB, 0 views)
File Type: txt surfaceFeatureExtractDict.txt (1.5 KB, 0 views)
File Type: txt snappyHexMeshDict.txt (13.9 KB, 3 views)
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Old   July 28, 2018, 02:48
Default refineWallLayer command
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Hello Gary,

I am also facing issues about layer addition process in snappyHexMesh. But I have found a way that mentioned in the forum which worked for me.

Set the layer number to 1 in the snappyHexMeshDict file.

Code:
nSurfaceLayers  1;
Then run snappyHexMesh. After that, simply divide the single layer generated by snappyHexMesh with the following command:

Code:
refineWallLayer sides 0.3
Hope this helps,

Yusuf.
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Old   July 30, 2018, 04:14
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Hi Yusuf,

Many thanks for you help.

I guess using this utility, say refineWallLayer "sides" 0.5, several times can get stretched near wall layers.

Regards, Gary
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