April 21, 2025, 10:48
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Finished Meshing with illegal Faces.
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#1
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New Member
Leonhard
Join Date: Apr 2025
Posts: 1
Rep Power: 0
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Hello
I was trying to create a Mesh with snappyHexMesh
but i got a error that i have 22336 illegal faces.
Here is the full output:
Code:
Overall mesh bounding box : (-30 -250 -25) (30 150 25)
Relative tolerance : 1e-06
Absolute matching distance : 0.000407554
Reading refinement surfaces.
Read refinement surfaces in = 0.02 s
Reading refinement shells.
Refinement level 2 for all cells inside refinementBox
Read refinement shells in = 0 s
Setting refinement level of surface to be consistent with shells.
For geometry MainBodyDone.stl detected 0 uncached triangles out of 1774
Checked shell refinement in = 0.03 s
Reading features.
Read edgeMesh mainBodyDone.eMesh
points : 163
edges : 163
boundingBox : (-12.475 -159 -12.475) (12.475 50 12.4709)
Refinement level according to distance to "mainBodyDone.eMesh" (163 points, 163 edges).
level 3 for all cells within 0 metre.
Read features in = 0.01 s
Determining initial surface intersections
-----------------------------------------
Edge intersection testing:
Number of edges : 392000
Number of edges to retest : 0
Number of intersected edges : 0
Edge intersection testing:
Number of edges : 392000
Number of edges to retest : 392000
Number of intersected edges : 0
Calculated surface intersections in = 0.62 s
Initial mesh : cells:128000 faces:392000 points:136161
Cells per refinement level:
0 128000
Adding patches for surface regions
----------------------------------
Patch Type Region
----- ---- ------
mainBody:
3 wall mainBody
Added patches in = 0.02 s
Edge intersection testing:
Number of edges : 392000
Number of edges to retest : 0
Number of intersected edges : 0
Selecting decompositionMethod none [1]
Refinement phase
----------------
Found point (0 -0.1 0) in cell 62040 on processor 0
Feature refinement iteration 0
------------------------------
Marked for refinement due to explicit features : 204 cells.
Determined cells to refine in = 1.48 s
Selected for feature refinement : 204 cells (out of 128000)
Edge intersection testing:
Number of edges : 397499
Number of edges to retest : 9318
Number of intersected edges : 0
Refined mesh in = 0.38 s
After refinement feature refinement iteration 0 : cells:129428 faces:397499 points:139002
Cells per refinement level:
0 127796
1 1632
Feature refinement iteration 1
------------------------------
Marked for refinement due to explicit features : 407 cells.
Determined cells to refine in = 1.35 s
Selected for feature refinement : 691 cells (out of 129428)
Edge intersection testing:
Number of edges : 415133
Number of edges to retest : 27839
Number of intersected edges : 0
Refined mesh in = 0.33 s
After refinement feature refinement iteration 1 : cells:134265 faces:415133 points:147335
Cells per refinement level:
0 127462
1 3947
2 2856
Feature refinement iteration 2
------------------------------
Marked for refinement due to explicit features : 858 cells.
Determined cells to refine in = 1.41 s
Selected for feature refinement : 1670 cells (out of 134265)
Edge intersection testing:
Number of edges : 456620
Number of edges to retest : 65743
Number of intersected edges : 0
Refined mesh in = 0.42 s
After refinement feature refinement iteration 2 : cells:145955 faces:456620 points:166079
Cells per refinement level:
0 127205
1 5293
2 7833
3 5624
Feature refinement iteration 3
------------------------------
Marked for refinement due to explicit features : 393 cells.
Determined cells to refine in = 1.56 s
Selected for feature refinement : 600 cells (out of 145955)
Edge intersection testing:
Number of edges : 471341
Number of edges to retest : 31202
Number of intersected edges : 0
Refined mesh in = 0.4 s
After refinement feature refinement iteration 3 : cells:150155 faces:471341 points:172599
Cells per refinement level:
0 127163
1 5448
2 8904
3 8640
Feature refinement iteration 4
------------------------------
Marked for refinement due to explicit features : 153 cells.
Determined cells to refine in = 1.73 s
Selected for feature refinement : 204 cells (out of 150155)
Edge intersection testing:
Number of edges : 476081
Number of edges to retest : 13843
Number of intersected edges : 0
Refined mesh in = 0.38 s
After refinement feature refinement iteration 4 : cells:151583 faces:476081 points:174472
Cells per refinement level:
0 127154
1 5478
2 9087
3 9864
Feature refinement iteration 5
------------------------------
Marked for refinement due to explicit features : 49 cells.
Determined cells to refine in = 1.67 s
Selected for feature refinement : 63 cells (out of 151583)
Edge intersection testing:
Number of edges : 477494
Number of edges to retest : 5074
Number of intersected edges : 0
Refined mesh in = 0.43 s
After refinement feature refinement iteration 5 : cells:152024 faces:477494 points:174988
Cells per refinement level:
0 127151
1 5491
2 9126
3 10256
Feature refinement iteration 6
------------------------------
Marked for refinement due to explicit features : 23 cells.
Determined cells to refine in = 1.59 s
Selected for feature refinement : 29 cells (out of 152024)
Edge intersection testing:
Number of edges : 478139
Number of edges to retest : 2316
Number of intersected edges : 0
Refined mesh in = 0.38 s
After refinement feature refinement iteration 6 : cells:152227 faces:478139 points:175219
Cells per refinement level:
0 127149
1 5503
2 9135
3 10440
Feature refinement iteration 7
------------------------------
Marked for refinement due to explicit features : 7 cells.
Determined cells to refine in = 1.66 s
Selected for feature refinement : 9 cells (out of 152227)
Edge intersection testing:
Number of edges : 478337
Number of edges to retest : 783
Number of intersected edges : 0
Refined mesh in = 0.41 s
After refinement feature refinement iteration 7 : cells:152290 faces:478337 points:175288
Cells per refinement level:
0 127149
1 5501
2 9144
3 10496
Feature refinement iteration 8
------------------------------
Marked for refinement due to explicit features : 3 cells.
Determined cells to refine in = 1.55 s
Selected for feature refinement : 3 cells (out of 152290)
Edge intersection testing:
Number of edges : 478400
Number of edges to retest : 296
Number of intersected edges : 0
Refined mesh in = 0.39 s
After refinement feature refinement iteration 8 : cells:152311 faces:478400 points:175307
Cells per refinement level:
0 127149
1 5501
2 9141
3 10520
Feature refinement iteration 9
------------------------------
Marked for refinement due to explicit features : 0 cells.
Determined cells to refine in = 1.55 s
Selected for feature refinement : 0 cells (out of 152311)
Stopping refining since too few cells selected.
Surface refinement iteration 0
------------------------------
Marked for refinement due to surface intersection : 0 cells.
Marked for refinement due to curvature/regions : 0 cells.
Determined cells to refine in = 0.01 s
Selected for refinement : 0 cells (out of 152311)
Stopping refining since too few cells selected.
Removing mesh beyond surface intersections
------------------------------------------
Setting cellZones according to locationsInMesh:
Location : (0 -0.1 0)
cellZone : none
For cellZone none found point (0 -0.1 0) in global region 0 out of 1 regions.
Keeping all cells containing inside points
Selected for keeping : 152311 cells.
Edge intersection testing:
Number of edges : 478400
Number of edges to retest : 0
Number of intersected edges : 0
Setting cellZones according to locationsInMesh:
Location : (0 -0.1 0)
cellZone : none
For cellZone none found point (0 -0.1 0) in global region 0 out of 1 regions.
Keeping all cells containing inside points
Selected for keeping : 152311 cells.
Edge intersection testing:
Number of edges : 478400
Number of edges to retest : 0
Number of intersected edges : 0
Shell refinement iteration 0
----------------------------
Marked for refinement due to distance to explicit features : 0 cells.
Marked for refinement due to refinement shells : 0 cells.
Determined cells to refine in = 0.76 s
Selected for internal refinement : 25 cells (out of 152311)
Edge intersection testing:
Number of edges : 478925
Number of edges to retest : 2276
Number of intersected edges : 0
Refined mesh in = 0.37 s
After refinement shell refinement iteration 0 : cells:152486 faces:478925 points:175482
Cells per refinement level:
0 127124
1 5701
2 9141
3 10520
Shell refinement iteration 1
----------------------------
Marked for refinement due to distance to explicit features : 0 cells.
Marked for refinement due to refinement shells : 0 cells.
Determined cells to refine in = 0.03 s
Selected for internal refinement : 0 cells (out of 152486)
Stopping refining since too few cells selected.
Dangling coarse cells refinement iteration 0
--------------------------------------------
Determined cells to refine in = 0.01 s
Selected for refinement : 0 cells (out of 152486)
Stopping refining since too few cells selected.
Dangling coarse cells refinement iteration 0
--------------------------------------------
Determined cells to refine in = 0 s
Selected for refinement : 0 cells (out of 152486)
Stopping refining since too few cells selected.
Refinement transition refinement iteration 0
--------------------------------------------
Determined cells to refine in = 0.01 s
Selected for refinement : 0 cells (out of 152486)
Stopping refining since too few cells selected.
Splitting mesh at surface intersections
---------------------------------------
Introducing baffles for 0 faces that are intersected by the surface.
Setting cellZones according to locationsInMesh:
Location : (0 -0.1 0)
cellZone : none
For cellZone none found point (0 -0.1 0) in global region 0 out of 1 regions.
Created baffles in = 0.22 s
After introducing baffles : cells:152486 faces:478925 points:175482
Cells per refinement level:
0 127124
1 5701
2 9141
3 10520
Introducing baffles to block off problem cells
----------------------------------------------
--> FOAM Warning :
From Foam::labelList Foam::meshRefinement::nearestPatch(const labelList&) const
in file meshRefinement/meshRefinement.C at line 460
Did not visit some faces, e.g. face 0 at (29.25 145 -24.375)
Assigning these faces to patch 3
markFacesOnProblemCells : marked 0 additional internal faces to be converted into baffles.
Analyzed problem cells in = 0.27 s
Introducing baffles to delete problem cells.
Created baffles in = 0.04 s
After introducing baffles : cells:152486 faces:478925 points:175482
Cells per refinement level:
0 127124
1 5701
2 9141
3 10520
Setting cellZones according to locationsInMesh:
Location : (0 -0.1 0)
cellZone : none
For cellZone none found point (0 -0.1 0) in global region 0 out of 1 regions.
Remove unreachable sections of mesh
-----------------------------------
Split mesh in = 0.08 s
After subsetting : cells:152486 faces:478925 points:175482
Cells per refinement level:
0 127124
1 5701
2 9141
3 10520
Introducing zones for interfaces
--------------------------------
Setting cellZones according to locationsInMesh:
Location : (0 -0.1 0)
cellZone : none
For cellZone none found point (0 -0.1 0) in global region 0 out of 1 regions.
Setting faceZones according to neighbouring cellZones:
Edge intersection testing:
Number of edges : 478925
Number of edges to retest : 0
Number of intersected edges : 0
Handling cells with snap problems
---------------------------------
Introducing baffles for 0 faces that are intersected by the surface.
Setting cellZones according to locationsInMesh:
Location : (0 -0.1 0)
cellZone : none
For cellZone none found point (0 -0.1 0) in global region 0 out of 1 regions.
Created baffles in = 0.42 s
After introducing baffles : cells:152486 faces:478925 points:175482
Cells per refinement level:
0 127124
1 5701
2 9141
3 10520
Introducing baffles to block off problem cells
----------------------------------------------
--> FOAM Warning :
From Foam::labelList Foam::meshRefinement::nearestPatch(const labelList&) const
in file meshRefinement/meshRefinement.C at line 460
Did not visit some faces, e.g. face 0 at (29.25 145 -24.375)
Assigning these faces to patch 3
markFacesOnProblemCells : marked 0 additional internal faces to be converted into baffles.
Analyzed problem cells in = 0.26 s
Introducing baffles to delete problem cells.
Created baffles in = 0.07 s
After introducing baffles : cells:152486 faces:478925 points:175482
Cells per refinement level:
0 127124
1 5701
2 9141
3 10520
Setting cellZones according to locationsInMesh:
Location : (0 -0.1 0)
cellZone : none
For cellZone none found point (0 -0.1 0) in global region 0 out of 1 regions.
Remove unreachable sections of mesh
-----------------------------------
Split mesh in = 0.1 s
After subsetting : cells:152486 faces:478925 points:175482
Cells per refinement level:
0 127124
1 5701
2 9141
3 10520
Merge free-standing baffles
---------------------------
freeStandingBaffles : detected 0 free-standing baffles out of 0
Detected free-standing baffles : 0
Merged free-standing baffles in = 0.01 s
dupNonManifoldPoints : Found : 0 non-manifold points (out of 175482)
Detected unsplittable baffles : 0
Merge refined boundary faces
----------------------------
Merging 0 sets of faces.
No faces merged ...
Merging all points on surface that
- are used by only two boundary faces and
- make an angle with a cosine of more than 0.707107.
No straight edges simplified and no points removed ...
Refined mesh : cells:152486 faces:478925 points:175482
Cells per refinement level:
0 127124
1 5701
2 9141
3 10520
Writing mesh to time 1
Wrote mesh in = 0.16 s.
Mesh refined in = 21.84 s.
Checking final mesh ...
Checking faces in error :
non-orthogonality > 65 degrees : 22336
faces with face pyramid volume < 1e-13 : 0
faces with face-decomposition tet quality < 1e-15 : 0
faces with concavity > 80 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 with triangle twist < 0.3 : 0
faces on cells with determinant < 0.001 : 0
Finished meshing with 22336 illegal faces (concave, zero area or negative cell pyramid volume)
Finished meshing in = 23.37 s.
End
And thats my dict:
Code:
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: v2012 |
| \\ / A nd | Website: www.openfoam.com |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
object snappyHexMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
castellatedMesh true;
snap true;
addLayers true;
mergeTolerance 1e-6;
geometry
{
MainBodyDone.stl
{
type triSurfaceMesh;
name mainBody;
scale 0.001;
}
refinementBox
{
type box;
min (-1.0 -1.0 0.0);
max (1.0 1.0 1.0);
}
}
castellatedMeshControls
{
maxLocalCells 100000;
maxGlobalCells 2000000;
minRefinementCells 10;
maxLoadUnbalance 0.10;
nCellsBetweenLevels 3;
features
(
{
file "mainBodyDone.eMesh";
level 6;
}
);
refinementSurfaces
{
mainBody
{
level (5 6);
patchInfo
{
type wall;
}
}
}
resolveFeatureAngle 30;
refinementRegions
{
refinementBox
{
mode inside;
levels ((1E15 4));
}
}
locationInMesh (0 -158 -12.2);
allowFreeStandingZoneFaces true;
}
snapControls
{
nSmoothPatch 3;
tolerance 2.0;
nSolveIter 30;
nRelaxIter 5;
nFeatureSnapIter 10;
implicitFeatureSnap false;
explicitFeatureSnap true;
multiRegionFeatureSnap false;
}
addLayersControls
{
relativeSizes true;
layers
{
mainBody
{
nSurfaceLayers 3;
}
}
expansionRatio 1.0;
finalLayerThickness 0.3;
minThickness 0.1;
nGrow 0;
featureAngle 60;
slipFeatureAngle 30;
nRelaxIter 3;
nSmoothSurfaceNormals 1;
nSmoothNormals 3;
nSmoothThickness 10;
maxFaceThicknessRatio 0.5;
maxThicknessToMedialRatio 0.3;
minMedialAxisAngle 90;
nBufferCellsNoExtrude 0;
nLayerIter 50;
}
meshQualityControls
{
maxNonOrtho 65;
maxBoundarySkewness 20;
maxInternalSkewness 4;
maxConcave 80;
minVol 1e-13;
minTetQuality 1e-15;
minArea -1;
minTwist 0.02;
minDeterminant 0.001;
minFaceWeight 0.02;
minVolRatio 0.01;
minTriangleTwist 0.3;
nSmoothScale 4;
errorReduction 0.75;
}
Could anyone help me in fixing this issue.
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