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[blockMesh] blockMesh - more control of grading

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Old   November 23, 2012, 07:47
Question blockMesh - more control of grading
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Dave Crossley
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Dear OpenFOAMers,

I have finished constructing an aerofoil in blockMesh and require a little advice.
You can see that I have created a C mesh around an aerofoil, the problem is that when I scale the outer leading edge of the mesh the inner leading edge also scales. I realise this is because I have created a hex mesh block within this area but I require the cells to only change distribution/scale in the outer section of the mesh NOT on the inner surface of the aerofoil. Notice the nasty, unwanted size in cells in 'Aerofoil_section'.

I have found more control in Salome but as I intend to use several angles of attack blockMesh was a very good meshing tool.

BlockMeshDict is also attached.


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File Type: jpg entire_C-Mesh.jpg (60.0 KB, 143 views)
File Type: jpg Aerofoil_section.jpg (71.6 KB, 119 views)

Last edited by crossley90; November 28, 2012 at 13:58.
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Old   November 23, 2012, 08:25
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Hey have you tried using edgeGradin instead of simpleGrading?

this gives you the opportunity to define a grading for each edge separately.

For an example blockMeshDict see here:

post number 5 contains the example
For further advice I recommend you to read the user guide as well.

have a nice weekend

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Old   December 19, 2022, 15:44
Default How to solve edgeGrading problem in BlockMeshDIct
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Mehulbhai Sasvadiya
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I am trying to do simpleGrading but get error.

Creating block offsets
Creating merge list (topological search)..

--> FOAM FATAL ERROR: (openfoam-2106 patch=211215)
Point merge failure between face 3 of block 4 and face 1 of block 5
Points: (78.3 87.4921 0) (75.8404 73.4568 0)
This may be due to inconsistent grading.

From void Foam::blockMesh::calcTopologicalMerge()
in file blockMesh/blockMeshMergeTopological.C at line 453.

FOAM exiting

please help me I am trying last two days to solve it but not getting solved
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File Type: txt BlockMesh.txt (15.1 KB, 1 views)
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blockmeshdict, grading, scale problem

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