I am trying to simulate nozzle cavitation and using interphasechangeFoam. When I check the quality of mesh gives following error about concave mesh. Is there anyone who can advise me how can I correct this error? And is this error really important or ignorable?
checkMesh -allTopology -allGeometry
Mesh stats
points: 654382
faces: 1596014
internal faces: 1412748
cells: 471322
boundary patches: 3
point zones: 0
face zones: 0
cell zones: 0
Overall number of cells of each type:
hexahedra: 410213
prisms: 0
wedges: 0
pyramids: 0
tet wedges: 0
tetrahedra: 0
polyhedra: 61109
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
wall 182766 183793 ok (non-closed singly connected) (-0.006 -0.008 -2.71051e-20) (0.00194 0.007 0.00194)
outlet 100 121 ok (non-closed singly connected) (0 -0.008 0) (0.00194 -0.008 0.00194)
inlet 400 451 ok (non-closed singly connected) (-0.006 0.007 0) (0.00194 0.007 0.00194)
Checking geometry...
Overall domain bounding box (-0.006 -0.008 -2.71051e-20) (0.00194 0.007 0.00194)
Mesh (non-empty, non-wedge) directions (1 1 1)
Mesh (non-empty) directions (1 1 1)
Boundary openness (2.22526e-14 -1.42534e-17 -2.50737e-15) OK.
Max cell openness = 2.06795e-16 OK.
Max aspect ratio = 2.5 OK.
Minumum face area = 3.75e-11. Maximum face area = 1.6e-07. Face area magnitudes OK.
Min volume = 7.03125e-16. Max volume = 6.4e-11. Total volume = 1.37934e-07. Cell volumes OK.
Mesh non-orthogonality Max: 29.0546 average: 10.3431
Non-orthogonality check OK.
Face pyramids OK.
Max skewness = 1.6129 OK.
Coupled point location match (average 0) OK.
Face tets OK.
Min/max edge length = 5e-06 0.0004 OK.
All angles in faces OK.
Face flatness (1 = flat, 0 = butterfly) : average = 1 min = 1
All face flatness OK.
Cell determinant (wellposedness) : minimum: 0.821136 average: 13.565
Cell determinant check OK.
***Concave cells (using face planes) found, number of cells: 58628
By the way, i forgat to say that i created mesh using StarCCM and converted to openfoam.
Hi Baris, I've never come across this error personally but there are a couple of topics over on CFD online that might be of help:
http://www.cfd-online.com/Forums/openfoam-meshing-utilities/122409-how-should-we-remove-concave-cells-mesh.html
http://www.cfd-online.com/Forums/openfoam-meshing-utilities/61501-about-openfoam-concave-faces-cells.html
Apologies if you've already tried these!
Dear Thomas,
Thanks for your reply. Yeah i have checked these threads and finally found out that concave mesh error is not a big deal.
By the way, i have divergence problem in the one simulation. I have already posted in CDF-online and also received some advices but still i have very small deltaaT and gives floating point error. If you have any idea, please share with me
http://www.cfd-online.com/Forums/openfoam-programming-development/131238-help-small-implementation-turbulence-model-2.html#post480808
Thanks
B.
If the mesh is not too complicated, try doing it with the OpenFOAM native mesher like blockMesh and snappyHexMesh.
Franco
Thanks Franco,
As you said, i already used blockMesh and refineMesh utulities and solved problem. I saw that if you just check mesh quality by typing only checkMesh, you cant see this message. On the other hand, It is just seen in the case of typing checkMesh -allTopology -allGeometry, and found that it is ignorable.
Thanks for your answer.
Baris
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