Hi,
i want to mesh a small gap (i hope its the correct word for it) with snappyHM and create layers. This wont work, and i dont know why.
As u can see in the picture, there is just one refinment level.
In my SHM-dict,i changed these values again and again:
PHP Code:
layers
{
motorBike_patch0
{
nSurfaceLayers 2;
} }
// Expansion factor for layer mesh
expansionRatio 1.1;//1.3
//- Wanted thickness of final added cell layer. If multiple layers
// is the thickness of the layer furthest away from the wall.
// See relativeSizes parameter.
finalLayerThickness 0.3;//0.3
//- Minimum thickness of cell layer. If for any reason layer
// cannot be above minThickness do not add layer.
// Relative to undistorted size of cell outside layer.
minThickness 0.1; //0.1
//- If points get not extruded do nGrow layers of connected faces that are
// also not grown. This helps convergence of the layer addition process
// close to features.
nGrow 1;
// Advanced settings
//- When not to extrude surface. 0 is flat surface, 90 is when two faces
// make straight angle.
featureAngle 30;
//- Maximum number of snapping relaxation iterations. Should stop
// before upon reaching a correct mesh.
nRelaxIter 3;
My log.file:
PHP Code:
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Patch Region
----- ------
motorBike:
5 motorBike_patch0
Added patches in = 0 s
Selecting decompositionMethod hierarchical
Refinement phase
----------------
Found point (0.01 0 0) in cell 44850 on processor 0
Reading external feature lines.
Read feature lines in = 0.06 s
.............................
Shell refinement iteration 1
----------------------------
Marked for refinement due to refinement shells : 0 cells.
Determined cells to refine in = 1.71 s
Selected for internal refinement : 0 cells (out of 1684138)
Stopping refining since too few cells selected.
Splitting mesh at surface intersections
---------------------------------------
Introducing baffles for 644084 faces that are intersected by the surface.
Edge intersection testing:
Number of edges : 6307648
Number of edges to retest : 5141672
Number of intersected edges : 1284130
Created baffles in = 13.14 s
After introducing baffles : cells:1684138 faces:6307648 points:2302709
Cells per refinement level:
0 0
1 80000
2 1604138
Introducing baffles to block off problem cells
----------------------------------------------
markFacesOnProblemCells : marked 1920631 additional internal faces to be converted into baffles.
Analyzed problem cells in = 5.33 s
Introducing baffles to delete problem cells.
Edge intersection testing:
Number of edges : 8228279
Number of edges to retest : 5781742
Number of intersected edges : 1284135
Created baffles in = 27.79 s
After introducing baffles : cells:1684138 faces:8228279 points:2302709
Cells per refinement level:
0 0
1 80000
2 1604138
Remove unreachable sections of mesh
-----------------------------------
Keeping all cells in region 10088 containing point (0.01 0 0)
Selected for keeping : 720000 cells.
Edge intersection testing:
Number of edges : 2445000
Number of edges to retest : 0
Number of intersected edges : 320000
Split mesh in = 4.13 s
After subsetting : cells:720000 faces:2445000 points:1006507
Cells per refinement level:
0 0
1 80000
2 640000
Handling cells with snap problems
---------------------------------
Introducing baffles for 320000 faces that are intersected by the surface.
Edge intersection testing:
Number of edges : 2445000
Number of edges to retest : 1282000
Number of intersected edges : 320000
Created baffles in = 2.63 s
After introducing baffles : cells:720000 faces:2445000 points:1006507
Cells per refinement level:
0 0
1 80000
2 640000
Introducing baffles to block off problem cells
----------------------------------------------
markFacesOnProblemCells : marked 0 additional internal faces to be converted into baffles.
Analyzed problem cells in = 1.76 s
Introducing baffles to delete problem cells.
Edge intersection testing:
Number of edges : 2445000
Number of edges to retest : 0
Number of intersected edges : 320000
Created baffles in = 1.71 s
After introducing baffles : cells:720000 faces:2445000 points:1006507
Cells per refinement level:
0 0
1 80000
2 640000
Remove unreachable sections of mesh
-----------------------------------
Keeping all cells in region 0 containing point (0.01 0 0)
Selected for keeping : 720000 cells.
Edge intersection testing:
Number of edges : 2445000
Number of edges to retest : 0
Number of intersected edges : 320000
Split mesh in = 1.88 s
After subsetting : cells:720000 faces:2445000 points:1006507
Cells per refinement level:
0 0
1 80000
2 640000
dupNonManifoldPoints : Found : 0 non-manifold points (out of 1006507)
Edge intersection testing:
Number of edges : 2445000
Number of edges to retest : 0
Number of intersected edges : 320000
getDuplicateFaces : found 0 pairs of duplicate faces.
Detected unsplittable baffles : 0
Merge refined boundary faces
----------------------------
mergePatchFaces : Merging 0 sets of faces.
Removing 0 straight edge points.
Refined mesh : cells:720000 faces:2445000 points:1006507
Cells per refinement level:
0 0
1 80000
2 640000
Writing mesh to time constant
Written mesh in = 19.77 s.
Morphing phase
--------------
Constructing mesh displacer ...
Using mesh parameters
{
maxNonOrtho 65;
maxBoundarySkewness 20;
maxInternalSkewness 4;
maxConcave 80;
minFlatness 0.5;
minVol 1e-13;
minArea -1;
minTwist 0.02;
minDeterminant 0.001;
minFaceWeight 0.02;
minVolRatio 0.01;
minTriangleTwist -1;
nSmoothScale 4;
errorReduction 0.75;
}
Checking initial mesh ...
Checking faces in error :
non-orthogonality > 65 degrees : 0
faces with face pyramid volume < 1e-13 : 2244000
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 on cells with determinant < 0.001 : 0
Detected 2244000 illegal faces (concave, zero area or negative cell pyramid volume)
Checked initial mesh in = 4.67 s
Smoothing patch points ...
Smoothing iteration 0
Found 0 non-mainfold point(s).
Scaling iteration 0
Moving mesh using diplacement scaling : min:1 max:1
Checking faces in error :
non-orthogonality > 65 degrees : 0
faces with face pyramid volume < 1e-13 : 2244000
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 on cells with determinant < 0.001 : 0
Successfully moved mesh
Smoothing iteration 1
Found 0 non-mainfold point(s).
Scaling iteration 0
Moving mesh using diplacement scaling : min:1 max:1
Checking faces in error :
non-orthogonality > 65 degrees : 0
faces with face pyramid volume < 1e-13 : 2244000
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 on cells with determinant < 0.001 : 0
Successfully moved mesh
Smoothing iteration 2
Found 0 non-mainfold point(s).
Scaling iteration 0
Moving mesh using diplacement scaling : min:1 max:1
Checking faces in error :
non-orthogonality > 65 degrees : 0
faces with face pyramid volume < 1e-13 : 2244000
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 on cells with determinant < 0.001 : 0
Successfully moved mesh
Patch points smoothed in = 13.19 s
Calculating patchDisplacement as distance to nearest surface point ...
Wanted displacement : average:1.60516e-05 min:5.95374e-06 max:1.6127e-05
Calculated surface displacement in = 0.11 s
Smoothing displacement ...
Iteration 0
Iteration 10
Iteration 20
Displacement smoothed in = 1.73 s
Moving mesh ...
Iteration 0
Moving mesh using diplacement scaling : min:1 max:1
Checking faces in error :
non-orthogonality > 65 degrees : 0
faces with face pyramid volume < 1e-13 : 2244000
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 on cells with determinant < 0.001 : 0
Successfully moved mesh
Moved mesh in = 4.05 s
Repatching faces according to nearest surface ...
Repatched 0 faces in = 1.66 s
Edge intersection testing:
Number of edges : 2445000
Number of edges to retest : 1308916
Number of intersected edges : 320000
Snapped mesh : cells:720000 faces:2445000 points:1006507
Cells per refinement level:
0 0
1 80000
2 640000
Writing mesh to time constant
Written mesh in = 17.19 s.
Shrinking and layer addition phase
----------------------------------
Using mesh parameters
{
maxNonOrtho 65;
maxBoundarySkewness 20;
maxInternalSkewness 4;
maxConcave 80;
minFlatness 0.5;
minVol 1e-13;
minArea -1;
minTwist 0.02;
minDeterminant 0.001;
minFaceWeight 0.02;
minVolRatio 0.01;
minTriangleTwist -1;
nSmoothScale 4;
errorReduction 0.75;
}
Merging all faces of a cell
---------------------------
- which are on the same patch
- which make an angle < 30 degrees
(cos:0.866025)
- as long as the resulting face doesn't become concave by more than 90 degrees
(0=straight, 180=fully concave)
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 0.866025.
No straight edges simplified and no points removed ...
Constructing mesh displacer ...
Checking mesh manifoldness ...
Checking initial mesh ...
Checking faces in error :
non-orthogonality > 65 degrees : 0
faces with face pyramid volume < 1e-13 : 2244000
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 on cells with determinant < 0.001 : 0
Detected 2244000 illegal faces (concave, zero area or negative cell pyramid volume)
Handling points with inconsistent layer specification ...
Handling non-manifold points ...
Checking patch manifoldness ...
Outside of local patch is multiply connected across edges or points at 0 points.
Set displacement to zero for all 0 non-manifold points
Handling feature edges ...
Set displacement to zero for points on 0 feature edges
Handling cells with warped patch faces ...
Set displacement to zero on 0 warped faces since layer would be > 0.5 of the size of the bounding box.
Growing non-extrusion points by one layer ...
Set displacement to zero for an additional 0 points.
patch faces layers avg thickness[m]
near-wall overall
----- ----- ------ --------- -------
motorBike_patch0 320000 2 1.36e-12 2.86e-12
medialAxisSmoothingInfo : Calculate distance to Medial Axis ...
shrinkMeshDistance : Smoothing normals ...
Iteration 0 residual 1.64e-18
Inserting points on patch ski
Inserting points on patch snow
Inserting points on patch sides
Inserting points on patch inlet
Inserting points on patch outlet
shrinkMeshDistance : Smoothing normals ...
shrinkMeshDistance : Smoothing normals in interior ...
Iteration 0 residual 0.0273
Layer addition iteration 0
--------------------------
Prevented extrusion on 0 coupled patch points during syncPatchDisplacement.
Determining displacement for added points according to pointNormal ...
Prevented extrusion on 0 coupled patch points during syncPatchDisplacement.
shrinkMeshMedialDistance : Smoothing using Medial Axis ...
shrinkMeshMedialDistance : Reduce layer thickness at 4000 nodes where thickness to medial axis distance is large
shrinkMeshDistance : Removing isolated regions ...
Number isolated points extrusion stopped : 0
shrinkMeshDistance : Smoothing field ...
Iteration 0 residual 2.44e-15
shrinkMeshMedialDistance : Moving mesh ...
Iteration 0
Moving mesh using diplacement scaling : min:1 max:1
Checking faces in error :
non-orthogonality > 65 degrees : 0
faces with face pyramid volume < 1e-13 : 2244000
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 on cells with determinant < 0.001 : 0
shrinkMeshMedialDistance : Successfully moved mesh
shrinkMeshMedialDistance : Finished moving mesh ...
Prevented extrusion on 0 coupled patch points during syncPatchDisplacement.
truncateDisplacement : Unextruded 0 faces due to non-consecutive vertices being extruded.
Setting up information for layer truncation ...
Checking mesh with layer ...
Checking faces in error :
non-orthogonality > 65 degrees : 0
faces with face pyramid volume < 1e-13 : 4152016
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 on cells with determinant < 0.001 : 0
Detected 4152016 illegal faces (concave, zero area or negative cell pyramid volume)
Extruding 0 out of 320000 faces. Removed extrusion at 180000 faces.
Layer addition iteration 1
--------------------------
Prevented extrusion on 0 coupled patch points during syncPatchDisplacement.
Determining displacement for added points according to pointNormal ...
Prevented extrusion on 0 coupled patch points during syncPatchDisplacement.
shrinkMeshMedialDistance : Smoothing using Medial Axis ...
shrinkMeshMedialDistance : Reduce layer thickness at 0 nodes where thickness to medial axis distance is large
shrinkMeshDistance : Removing isolated regions ...
Number isolated points extrusion stopped : 0
shrinkMeshDistance : Smoothing field ...
Iteration 0 residual 0
shrinkMeshMedialDistance : Moving mesh ...
Iteration 0
Moving mesh using diplacement scaling : min:1 max:1
Checking faces in error :
non-orthogonality > 65 degrees : 0
faces with face pyramid volume < 1e-13 : 2244000
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 on cells with determinant < 0.001 : 0
shrinkMeshMedialDistance : Successfully moved mesh
shrinkMeshMedialDistance : Finished moving mesh ...
Prevented extrusion on 0 coupled patch points during syncPatchDisplacement.
truncateDisplacement : Unextruded 0 faces due to non-consecutive vertices being extruded.
Setting up information for layer truncation ...
Checking mesh with layer ...
Checking faces in error :
non-orthogonality > 65 degrees : 0
faces with face pyramid volume < 1e-13 : 2244000
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 on cells with determinant < 0.001 : 0
Detected 2244000 illegal faces (concave, zero area or negative cell pyramid volume)
Extruding 0 out of 320000 faces. Removed extrusion at 0 faces.
Edge intersection testing:
Number of edges : 2445000
Number of edges to retest : 0
Number of intersected edges : 320000
Writing 0 added cells to cellSet addedCells
Writing 0 faces inside added layer to faceSet layerFaces
Layer mesh : cells:720000 faces:2445000 points:1006507
Cells per refinement level:
0 0
1 80000
2 640000
Writing mesh to time constant
Written mesh in = 62.4 s.
Finished meshing in = 279 s.
End
Two Problems are possible:
1) The meshing is not possible because of the 1mm.
2) My block Mesh box is too big.
Maybe you have an idea, 4 weeks remain for my thesis
Edit: Sry for the bad picture quality. You can read, stl stl and 1 mm , maybe.
December 21, 2011, 05:18
No layers in a small gap
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