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[snappyHexMesh] sHM quality of multi-region

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Old   April 16, 2015, 11:38
Default sHM quality of multi-region
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amine
Join Date: Jan 2014
Location: FRANCE
Posts: 84
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Hi,
I have check my mesh with checkMesh -allGeometry -allTopology
I want to understand what does mean : 9122 illegal face (concave, zero area or negative cell pyramid mesh) and if it's affect my simulations?
How I can resolve the problem of concave mesh or negative cell pyramid mesh?
You can see in picture good mesh but when I check my mesh I found 2 failed mesh.
Thanks
Code:
/*---------------------------------------------------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  2.3.0                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
Build  : 2.3.0-f5222ca19ce6
Exec   : checkMesh -allGeometry -allTopology
Date   : Apr 16 2015
Time   : 16:34:19
Host   : "mesbahi-VirtualBox"
PID    : 29101
Case   : /home/mesbahi/OpenFOAM/mesbahi-2.3.0/run/travail/spotOFtest/spotOF
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster
allowSystemOperations : Disallowing user-supplied system call operations

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time

Create polyMesh for time = 0

Enabling all (cell, face, edge, point) topology checks.

Enabling all geometry checks.

Time = 0

Mesh stats
    points:           3192315
    faces:            9158547
    internal faces:   9120147
    cells:            2983210
    faces per cell:   6.12719
    boundary patches: 71
    point zones:      0
    face zones:       35
    cell zones:       35

Overall number of cells of each type:
    hexahedra:     2876652
    prisms:        0
    wedges:        0
    pyramids:      0
    tet wedges:    0
    tetrahedra:    0
    polyhedra:     106558
    Breakdown of polyhedra by number of faces:
        faces   number of cells
            6   30695
            9   40889
           12   21531
           15   11246
           18   2196
           21   1

Checking topology...
    Boundary definition OK.
    Cell to face addressing OK.
    Point usage OK.
    Upper triangular ordering OK.
    Face vertices OK.
    Topological cell zip-up check OK.
    Face-face connectivity OK.
    Number of regions: 1 (OK).

Checking patch topology for multiply connected surfaces...
                   Patch    Faces   Points                  Surface topology Bounding box
              boundaries    38400    38402      ok (closed singly connected) (-0.25 -0.25 -0.15) (0.25 0.25 0.35)
                     ALU        0        0                        ok (empty)
               ALU_slave        0        0                        ok (empty)
             Dissipateur        0        0                        ok (empty)
       Dissipateur_slave        0        0                        ok (empty)
                    LED1        0        0                        ok (empty)
              LED1_slave        0        0                        ok (empty)
                   LED10        0        0                        ok (empty)
             LED10_slave        0        0                        ok (empty)
                   LED11        0        0                        ok (empty)
             LED11_slave        0        0                        ok (empty)
                   LED12        0        0                        ok (empty)
             LED12_slave        0        0                        ok (empty)
                   LED13        0        0                        ok (empty)
             LED13_slave        0        0                        ok (empty)
                   LED14        0        0                        ok (empty)
             LED14_slave        0        0                        ok (empty)
                   LED15        0        0                        ok (empty)
             LED15_slave        0        0                        ok (empty)
                   LED16        0        0                        ok (empty)
             LED16_slave        0        0                        ok (empty)
                    LED2        0        0                        ok (empty)
              LED2_slave        0        0                        ok (empty)
                    LED3        0        0                        ok (empty)
              LED3_slave        0        0                        ok (empty)
                    LED4        0        0                        ok (empty)
              LED4_slave        0        0                        ok (empty)
                    LED5        0        0                        ok (empty)
              LED5_slave        0        0                        ok (empty)
                    LED6        0        0                        ok (empty)
              LED6_slave        0        0                        ok (empty)
                    LED7        0        0                        ok (empty)
              LED7_slave        0        0                        ok (empty)
                    LED8        0        0                        ok (empty)
              LED8_slave        0        0                        ok (empty)
                    LED9        0        0                        ok (empty)
              LED9_slave        0        0                        ok (empty)
                   MCPCB        0        0                        ok (empty)
             MCPCB_slave        0        0                        ok (empty)
                 source1        0        0                        ok (empty)
           source1_slave        0        0                        ok (empty)
                source10        0        0                        ok (empty)
          source10_slave        0        0                        ok (empty)
                source11        0        0                        ok (empty)
          source11_slave        0        0                        ok (empty)
                source12        0        0                        ok (empty)
          source12_slave        0        0                        ok (empty)
                source13        0        0                        ok (empty)
          source13_slave        0        0                        ok (empty)
                source14        0        0                        ok (empty)
          source14_slave        0        0                        ok (empty)
                source15        0        0                        ok (empty)
          source15_slave        0        0                        ok (empty)
                source16        0        0                        ok (empty)
          source16_slave        0        0                        ok (empty)
                 source2        0        0                        ok (empty)
           source2_slave        0        0                        ok (empty)
                 source3        0        0                        ok (empty)
           source3_slave        0        0                        ok (empty)
                 source4        0        0                        ok (empty)
           source4_slave        0        0                        ok (empty)
                 source5        0        0                        ok (empty)
           source5_slave        0        0                        ok (empty)
                 source6        0        0                        ok (empty)
           source6_slave        0        0                        ok (empty)
                 source7        0        0                        ok (empty)
           source7_slave        0        0                        ok (empty)
                 source8        0        0                        ok (empty)
           source8_slave        0        0                        ok (empty)
                 source9        0        0                        ok (empty)
           source9_slave        0        0                        ok (empty)

Checking geometry...
    Overall domain bounding box (-0.25 -0.25 -0.15) (0.25 0.25 0.35)
    Mesh (non-empty, non-wedge) directions (1 1 1)
    Mesh (non-empty) directions (1 1 1)
    Boundary openness (-8.735056e-17 -1.252181e-15 -3.096387e-15) OK.
    Max cell openness = 4.455474e-16 OK.
    Max aspect ratio = 16.27134 OK.
    Minimum face area = 4.189e-10. Maximum face area = 3.932657e-05.  Face area magnitudes OK.
    Min volume = 8.184723e-14. Max volume = 2.461116e-07.  Total volume = 0.125.  Cell volumes OK.
    Mesh non-orthogonality Max: 75.63721 average: 9.745855
   *Number of severely non-orthogonal (> 70 degrees) faces: 23.
    Non-orthogonality check OK.
  <<Writing 23 non-orthogonal faces to set nonOrthoFaces
    Face pyramids OK.
    Max skewness = 2.463072 OK.
    Coupled point location match (average 0) OK.
 ***Error in face tets: 73 faces with low quality or negative volume decomposition tets.
  <<Writing 73 faces with low quality or negative volume decomposition tets to set lowQualityTetFaces
   *Edges too small, min/max edge length = 1.615488e-07 0.006278598, number too small: 6
  <<Writing 6 points on short edges to set shortEdges
   *There are 21518 faces with concave angles between consecutive edges. Max concave angle = 89.91077 degrees.
  <<Writing 21518 faces with concave angles to set concaveFaces
    Face flatness (1 = flat, 0 = butterfly) : min = 0.4107551  average = 0.9993399
   *There are 82 faces with ratio between projected and actual area < 0.8
    Minimum ratio (minimum flatness, maximum warpage) = 0.4107551
  <<Writing 82 warped faces to set warpedFaces
    Cell determinant (wellposedness) : minimum: 0.00615444 average: 11.70074
    Cell determinant check OK.
 ***Concave cells (using face planes) found, number of cells: 87551
  <<Writing 87551 concave cells to set concaveCells
    Face interpolation weight : minimum: 0.05250315 average: 0.478492
    Face interpolation weight check OK.
    Face volume ratio : minimum: 0.01658261 average: 0.9001287
    Face volume ratio check OK.

Failed 2 mesh checks.

End
Attached Images
File Type: jpg imagespot1.jpg (63.1 KB, 29 views)
File Type: jpg imagespot2.jpg (70.2 KB, 26 views)
File Type: jpg imagespot3.jpg (55.5 KB, 25 views)
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