| Nagesh Atreyas |
December 16, 2014 04:14 |
CheckMesh vs CheckMesh -allGeometry -allTopology
5 Attachment(s)
Hello dear Foamers,
I am a new user to OpenFoam.I have been trying to simulate the flow in a Valve.The solutions diverged and so I starting debugging my setup.
To start with,I did checkMesh and everythin was 'ok' and I ran the simulation.But now I did a complete meshcheck and I see a few warnings and errors. (which might be the source of divergence)
I have attached the checkMesh -allGeometry -allTopology output below.
From the forum I could understand that concave cells and faces are not necessarily a threat to the convergence.
These cells and faces are unfortunately spread all over the Valve.Cells with small determinant,warped faces happen to be the other errors.
I will attach the pics of these faces and cells,as well as a slice of my mesh.
I don't know if the pics give as much clarity as I wanted.
I will provide more info if needed.
Kindly help me.Any tips and hints will be of great help.Thanks.
Code:
CHECKMESH -allGeometry -allTopology
Create time
Create polyMesh for time = 0
Enabling all (cell, face, edge, point) topology checks.
Enabling all geometry checks.
Time = 0
Mesh stats
points: 5800847
faces: 16111264
internal faces: 15551508
cells: 5172099
faces per cell: 6.12184
boundary patches: 5
point zones: 0
face zones: 0
cell zones: 0
Overall number of cells of each type:
hexahedra: 4634186
prisms: 150126
wedges: 0
pyramids: 0
tet wedges: 1817
tetrahedra: 8
polyhedra: 385962
Breakdown of polyhedra by number of faces:
faces number of cells
4 33452
5 22367
6 76411
7 69622
8 19837
9 93654
10 1421
11 396
12 50423
13 48
14 56
15 16255
16 4
17 13
18 1576
20 3
21 361
24 63
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
leftWall 0 0 ok (empty)
defaultFaces 0 0 ok (empty)
Valve_Inlet 22153 28444 ok (non-closed singly connected) (0.574884 -0.0725724 -0.0726628) (0.575 0.0725739 0.0726582)
Valve_Outlet 7132 9634 ok (non-closed singly connected) (-1.175 -0.0725353 -0.0726304) (-1.17454 0.072542 0.0726303)
Valve_Wall 530471 576275 ok (non-closed singly connected) (-1.175 -0.101373 -0.120015) (0.575 0.101373 0.0901)
Checking geometry...
Overall domain bounding box (-1.175 -0.101373 -0.120015) (0.575 0.101373 0.0901)
Mesh (non-empty, non-wedge) directions (1 1 1)
Mesh (non-empty) directions (1 1 1)
Boundary openness (2.72347e-15 1.09433e-15 6.58078e-15) OK.
Max cell openness = 3.31988e-15 OK.
Max aspect ratio = 70.5339 OK.
Minimum face area = 6.20277e-09. Maximum face area = 0.000151314. Face area magnitudes OK.
Min volume = 3.0642e-12. Max volume = 1.73353e-06. Total volume = 0.0314532. Cell volumes OK.
Mesh non-orthogonality Max: 64.9982 average: 7.81883
Non-orthogonality check OK.
Face pyramids OK.
Max skewness = 2.15949 OK.
Coupled point location match (average 0) OK.
Face tets OK.
Min/max edge length = 1.16846e-05 0.0126579 OK.
*There are 2959 faces with concave angles between consecutive edges. Max concave angle = 79.9922 degrees.
<<Writing 2959 faces with concave angles to set concaveFaces
Face flatness (1 = flat, 0 = butterfly) : average = 0.99964 min = 0.64177
*There are 63 faces with ratio between projected and actual area < 0.8
Minimum ratio (minimum flatness, maximum warpage) = 0.64177
<<Writing 63 warped faces to set warpedFaces
Cell determinant (wellposedness) : minimum: 2.71366e-05 average: 7.71483
***Cells with small determinant (< 0.001) found, number of cells: 6182
<<Writing 6182 under-determined cells to set underdeterminedCells
***Concave cells (using face planes) found, number of cells: 186108
<<Writing 186108 concave cells to set concaveCells
Failed 2 mesh checks.
End
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