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[snappyHexMesh] Information about layer coverage

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Old   August 25, 2018, 13:01
Post Information about layer coverage
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Luca
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Hello guys,

I was wondering if there is a way to extract information about the percentage of layer coverage on a surface. In other words, I would like to get an indication like:

''Patch xx has 90% of its surface covered by layers.''

I am using snappyHexMesh as meshing tool.

Any help would be highly appreciated.

Thanks,

Luca
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Old   September 17, 2018, 15:30
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FredPieri
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Quote:
Originally Posted by streamline90 View Post
Hello guys,

I was wondering if there is a way to extract information about the percentage of layer coverage on a surface. In other words, I would like to get an indication like:

''Patch xx has 90% of its surface covered by layers.''

I am using snappyHexMesh as meshing tool.

Any help would be highly appreciated.

Thanks,

Luca

Hi Luca,


at the end of the snappyHexmesh log you have a kind of table looking like this:


Code:

patch   faces    layers   overall    thickness
                                           [m]       [%]
-----     -----          ------          ---       ---
w_walls  104424   9.46     0.0187    97.4    


Doing final balancing
---------------------

Writing 988052 added cells to cellSet addedCells
Writing 883923 faces inside added layer to faceSet layerFaces

Writing fields with layer information:
    nSurfaceLayers    : actual number of layers
    thickness         : overall layer thickness
    thicknessFraction : overall layer thickness (fraction of desired thickness)

Layer mesh : cells:10417638  faces:31685237  points:10864745
Cells per refinement level:
    0    96644
    1    140357
    2    183841
    3    285012
    4    541401
    5    1370680
    6    4468511
    7    3331192
Writing mesh to time 3
Wrote mesh in = 718 s.
Layers added in = 717.96 s.
Checking final mesh ...
Checking faces in error :
    non-orthogonality > 82  degrees                        : 0
    faces with face pyramid volume < 1e-13                 : 0
    faces with concavity > 75  degrees                     : 0
    faces with skewness > 4   (internal) or 20  (boundary) : 0
    faces with interpolation weights (0..1)  < 0.02        : 0
    faces with volume ratio of neighbour cells < 0.01      : 0
    faces with face twist < 0.02                           : 0
    faces on cells with determinant < 0.001                : 0
Finished meshing without any errors
Finished meshing in = 731.81 s.
End

Finalising parallel run

I use the line:

Code:
patch   faces    layers   overall    thickness
                                            [m]       [%]
-----     -----          ------          ---       ---
 w_walls  104424   9.46     0.0187    97.4


and compare the number of layers ( 9.46 in th is case ) t othe number I asked ( 10 in my case)


I hope it help.


Cheers
fred
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