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[cfMesh] Number of edges not aligned with or perpendicular to non-empty directions |
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December 7, 2017, 19:00 |
Number of edges not aligned with or perpendicular to non-empty directions
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#1 |
Member
giovanni
Join Date: Sep 2017
Posts: 50
Rep Power: 9 |
hi guys,
i' ve a problem with cf mesh. when i run checkMesh it give me a warning about " ***Number of edges not aligned with or perpendicular to non-empty directions: 6279101 <<Writing 2768080 points on non-aligned edges to set nonAlignedEdges i do not understand how it is possible . i'm carring out a set of simulation with small changes in the mesh. the previous one seems to work well but this geometry seems to have a great problem. edged are not aligned or perpendicular to a non empty direction . if i take a look in to polyMesh i found that are created only empty patches.. anyone has an idea? checkMesh reported here: Create time --> FOAM Warning : From function static Foam::instantList Foam::timeSelector::select0(Foam::Time&, const Foam::argList&) in file db/Time/timeSelector.C at line 270 No time specified or available, selecting 'constant' Create polyMesh for time = constant Time = constant Mesh stats points: 3757380 internal points: 3426744 faces: 10779184 internal faces: 10448528 cells: 3511133 faces per cell: 6.04583 boundary patches: 1 point zones: 0 face zones: 0 cell zones: 0 Overall number of cells of each type: hexahedra: 3464529 prisms: 0 wedges: 0 pyramids: 0 tet wedges: 0 tetrahedra: 0 polyhedra: 46604 Breakdown of polyhedra by number of faces: faces number of cells 6 16753 9 11417 12 13255 15 5007 18 170 21 2 Checking topology... Boundary definition OK. ***Total number of faces on empty patches is not divisible by the number of cells in the mesh. Hence this mesh is not 1D or 2D. 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 quattro 330656 330636 ok (closed singly connected) Checking geometry... Overall domain bounding box (0.0367414 -0.09 0.346494) (0.236666 0.323322 0.627876) Mesh has 0 geometric (non-empty/wedge) directions (0 0 0) Mesh has 0 solution (non-empty) directions (0 0 0) ***Number of edges not aligned with or perpendicular to non-empty directions: 6279101 <<Writing 2768080 points on non-aligned edges to set nonAlignedEdges Boundary openness (-2.19367e-14 1.13379e-14 6.84195e-15) OK. Max cell openness = 2.96886e-16 OK. Max aspect ratio = -1 OK. Minimum face area = 1.08531e-08. Maximum face area = 1.24714e-05. Face area magnitudes OK. Min volume = 6.48767e-12. Max volume = 4.86187e-08. Total volume = 0.00358825. Cell volumes OK. Mesh non-orthogonality Max: 57.6221 average: 2.75489 Non-orthogonality check OK. Face pyramids OK. Max skewness = 2.73634 OK. Coupled point location match (average 0) OK. Failed 1 mesh checks. End here the meshDict surfaceFile "quattro.stl"; maxCellSize 0.0035; boundaryCellSize 0.001; boundaryCellSizeRefinementThickness 0.01 //minCellSize 0.0008; keepCellsIntersectingBoundary 1; removeGluedMesh 1; |
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December 8, 2017, 05:00 |
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#2 |
Senior Member
Join Date: Sep 2013
Posts: 353
Rep Power: 21 |
Go into your polyMesh/boundary file. By default all types are set to empty. Change those to patch or wall and rerun checkMesh
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December 10, 2017, 17:11 |
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#3 |
Member
giovanni
Join Date: Sep 2017
Posts: 50
Rep Power: 9 |
hi!! thank you very much!! it works perfectly now...
another issue.. thres's some region called empty but they do not have any cells . it is necessary to delete them or they do not cause problem in the simulation? now my new check Mesh is this one: could you think that it has a sufficiently good quality?? i' m worried about aspect ratio.. it seems very hight.. Create time --> FOAM Warning : From function static Foam::instantList Foam::timeSelector::select0(Foam::Time&, const Foam::argList&) in file db/Time/timeSelector.C at line 270 No time specified or available, selecting 'constant' Create polyMesh for time = constant Time = constant Mesh stats points: 2792299 faces: 7847463 internal faces: 7528612 cells: 2527382 faces per cell: 6.0838 boundary patches: 12 point zones: 0 face zones: 0 cell zones: 0 Overall number of cells of each type: hexahedra: 2410891 prisms: 20164 wedges: 0 pyramids: 8444 tet wedges: 0 tetrahedra: 6872 polyhedra: 81011 Breakdown of polyhedra by number of faces: faces number of cells 6 22678 7 4998 8 589 9 27975 12 19931 13 8 15 4576 16 4 17 1 18 209 20 2 21 33 24 7 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 plenum 103694 104416 ok (non-closed singly connected) testa 29822 30110 ok (non-closed singly connected) condotto 45648 46087 ok (non-closed singly connected) inlet 43513 44055 ok (non-closed singly connected) piatto 51674 52055 ok (non-closed singly connected) outlet 4868 5027 ok (non-closed singly connected) valvole 30565 30602 ok (non-closed singly connected) guida 1862 1949 ok (non-closed singly connected) sedi 7205 7485 ok (non-closed singly connected) quattro_2 0 0 ok (empty) quattro_9 0 0 ok (empty) quattro_10 0 0 ok (empty) Checking geometry... Overall domain bounding box (0.0367533 -0.125 0.346492) (0.236648 0.323311 0.627968) Mesh has 3 geometric (non-empty/wedge) directions (1 1 1) Mesh has 3 solution (non-empty) directions (1 1 1) Boundary openness (-4.341e-15 -1.86798e-14 -1.45889e-14) OK. Max cell openness = 5.87834e-16 OK. Max aspect ratio = 33.0007 OK. Minimum face area = 4.30116e-10. Maximum face area = 1.29014e-05. Face area magnitudes OK. Min volume = 1.08967e-13. Max volume = 5.07204e-08. Total volume = 0.00376277. Cell volumes OK. Mesh non-orthogonality Max: 68.4809 average: 6.13727 Non-orthogonality check OK. Face pyramids OK. Max skewness = 2.52075 OK. Coupled point location match (average 0) OK. Mesh OK. End |
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