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[OpenFOAM] Model has lots of dots and marks all over the surface

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Old   May 13, 2025, 11:23
Question Model has lots of dots and marks all over the surface
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Marius
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Hi,


did anyone ever came across this? I am simulation only half of the domain with a symmetryPlane.


Screenshot 2025-05-13 at 17.10.37.jpg




Code:
/*---------------------------------------------------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  2412                                  |
|   \\  /    A nd           | Website:  www.openfoam.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
Build  : _2c4871ff-20250317 OPENFOAM=2412 version=2412
Arch   : "LSB;label=32;scalar=64"
Exec   : checkMesh
Date   : May 06 2025
Time   : 20:40:57
Host   : 56205.example.us
PID    : 72421
I/O    : uncollated
Case   : /home/OpenFOAM/CLIOHALF2
nProcs : 1
trapFpe: Floating point exception trapping enabled (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster (fileModificationSkew 5, maxFileModificationPolls 20)
allowSystemOperations : Allowing user-supplied system call operations

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

Create mesh for time = 0

Check mesh...

Time = 0

Mesh stats
    points:           43991605
    faces:            117311755
    internal faces:   110626790
    cells:            36924357
    faces per cell:   6.1731216
    boundary patches: 7
    point zones:      1
    face zones:       0
    cell zones:       0

Overall number of cells of each type:
    hexahedra:     32347374
    prisms:        1033072
    wedges:        291
    pyramids:      0
    tet wedges:    17701
    tetrahedra:    48
    polyhedra:     3525871
    Breakdown of polyhedra by number of faces:
        faces   number of cells
            4   378039
            5   329713
            6   782340
            7   26767
            8   15003
            9   1325453
           10   4928
           11   4652
           12   494581
           13   715
           14   1048
           15   153879
           16   56
           17   166
           18   8490
           19   2
           20   3
           21   36

Checking topology...
    Boundary definition OK.
    Cell to face addressing OK.
    Point usage OK.
    Upper triangular ordering OK.
    Face vertices OK.
    Number of regions: 1 (OK).

Checking patch topology for multiply connected surfaces...
                   Patch    Faces   Points  Surface topology
           symmetryPlane    80653    88377  ok (non-closed singly connected)
                   inlet      132      156  ok (non-closed singly connected)
                  outlet      132      156  ok (non-closed singly connected)
               lowerWall    33798    35074  ok (non-closed singly connected)
               upperWall      684      754  ok (non-closed singly connected)
            frontAndBack      627      696  ok (non-closed singly connected)
                     car  6568939  7103448  multiply connected (shared edge)
                    ".*"  6684965  7219733  multiply connected (shared edge)

Detected 2 bad edges (possibly relevant for finite-area)

Checking faceZone topology for multiply connected surfaces...
    No faceZones found.
  <<Writing 4 conflicting points to set nonManifoldPoints

Checking basic cellZone addressing...
    No cellZones found.

Checking basic pointZone addressing...
               PointZone  PointsBoundingBox
            frozenPoints       0(1e+150 1e+150 1e+150) (-1e+150 -1e+150 -1e+150)

Checking geometry...
    Overall domain bounding box (-6.5664248e-07 -5 -2.1495223e-44) (4.025 14.95 3.85)
    Mesh has 3 geometric (non-empty/wedge) directions (1 1 1)
    Mesh has 3 solution (non-empty) directions (1 1 1)
    Boundary openness (-1.4984639e-14 -1.6837704e-17 1.3857271e-15) OK.
    Max cell openness = 1.5387185e-15 OK.
    Max aspect ratio = 62.493939 OK.
    Minimum face area = 1.271819e-09. Maximum face area = 0.1225645.  Face area magnitudes OK.
    Min volume = 1.2435955e-11. Max volume = 0.041102722.  Total volume = 309.15002.  Cell volumes OK.
    Mesh non-orthogonality Max: 77.234401 average: 10.591205
   *Number of severely non-orthogonal (> 70 degrees) faces: 22.
    Non-orthogonality check OK.
  <<Writing 22 non-orthogonal faces to set nonOrthoFaces
    Face pyramids OK.
    Max skewness = 3.9999814 OK.
    Coupled point location match (average 0) OK.

Mesh OK.

End



Maybe some holes in the mesh?


Thanks for feedback!


Marius
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Old   May 14, 2025, 03:40
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Tom Fahner
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Hi Marius,

My guess is that you would need to put an extractBlock filter on the data to separate the internal mesh and the car walls. They may now lay on top of each other, which gives the visualization issue.

Regards,
Tom
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