[Maarten]

Hello,

I am trying to run a modified version of the propellor example as provided in OpenFoam 8

As pimplefoam continues to fail on my modified propeller geometry I am using checkMesh trying to understand what is wrong.

checkMesh -allGeometry  -allTopology -writeSets vtk

This however gives me identical errors between the original examples and my modified example as you can see in the output below returned by the original example.

Why is it that the original mesh of the example has so many errors ?
Isn't the example supposed to run without meshing errors ?


Thanks in advance,
Maarten,

geometry...
    Overall domain bounding box (-0.3 -0.8 -0.301741) (0.3 0.2 0.301741)
    Mesh has 3 geometric (non-empty/wedge) directions (1 1 1)
    Mesh has 3 solution (non-empty) directions (1 1 1)
    Boundary openness (-3.05825e-17 -4.94035e-17 3.62601e-17) OK.
    Max cell openness = 3.26495e-16 OK.
    Max aspect ratio = 4.8112 OK.
    Minimum face area = 3.76263e-09. Maximum face area = 0.0035105.  Face area magnitudes OK.
    Min volume = 3.65987e-10. Max volume = 0.000170818.  Total volume = 0.280506.  Cell volumes OK.
    Mesh non-orthogonality Max: 62.5882 average: 7.58402
    Non-orthogonality check OK.
    Face pyramids OK.
 ***Max skewness = 6.68429, 23 highly skew faces detected which may impair the quality of the results
  <<Writing 23 skew faces to set skewFaces
    Coupled point location match (average 0) OK.
 ***Error in face tets: 355 faces with low quality or negative volume decomposition tets.
  <<Writing 343 faces with low quality or negative volume decomposition tets to set lowQualityTetFaces
    Min/max edge length = 3.39833e-05 0.0669812 OK.
  <<Writing 44946 near (closer than 1.31308e-06 apart) points to set nearPoints
   *There are 876 faces with concave angles between consecutive edges. Max concave angle = 73.9559 degrees.
  <<Writing 876 faces with concave angles to set concaveFaces
    Face flatness (1 = flat, 0 = butterfly) : min = 0.40278  average = 0.999356
   *There are 12 faces with ratio between projected and actual area < 0.8
    Minimum ratio (minimum flatness, maximum warpage) = 0.40278
  <<Writing 12 warped faces to set warpedFaces
    Cell determinant (wellposedness) : minimum: 0.197347 average: 11.926
    Cell determinant check OK.
 ***Concave cells (using face planes) found, number of cells: 18042
  <<Writing 18042 concave cells to set concaveCells
    Face interpolation weight : minimum: 0.100592 average: 0.48225
    Face interpolation weight check OK.
    Face volume ratio : minimum: 0.0256112 average: 0.907362
    Face volume ratio check OK.
Calculating AMI weights between owner patch: AMI1 and neighbour patch: AMI2
AMI: Creating addressing and weights between 22416 source faces and 22416 target faces
AMI: Patch source sum(weights) min/max/average = 1, 1, 1
AMI: Patch target sum(weights) min/max/average = 1, 1, 1

Failed 3 mesh checks.