August 15, 2014, 22:02
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ParaView shows bad cells, checkMesh doesn't seem to notice.
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#1
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New Member
Join Date: Jan 2014
Location: South Florida
Posts: 20
Rep Power: 12
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Hey OpenFOAMers,
So I've got this mesh. blockMesh runs without errors and checkMesh does not report any bad cells. Viewing the mesh from the outside or from the inside (Cull Front Face) the mesh looks good, but then if I take a clip to look at the interior volume cells I can see some uglyness (See third image attached). Any idea whats going on here?
checkMesh Log:
Code:
Mesh stats
points: 869716
faces: 2557500
internal faces: 2506500
cells: 844000
faces per cell: 6
boundary patches: 9
point zones: 0
face zones: 0
cell zones: 0
Overall number of cells of each type:
hexahedra: 844000
prisms: 0
wedges: 0
pyramids: 0
tet wedges: 0
tetrahedra: 0
polyhedra: 0
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
inlet 2400 2501 ok (non-closed singly connected)
outlet 7200 7381 ok (non-closed singly connected)
leftWall 9000 9196 ok (non-closed singly connected)
rightWall 9000 9196 ok (non-closed singly connected)
upperWall 7700 7836 ok (non-closed singly connected)
lowerWall 5700 5875 ok (non-closed singly connected)
cylWall 3200 3280 ok (non-closed singly connected)
cylTop 2000 2041 ok (non-closed singly connected)
trip 4800 4941 ok (non-closed singly connected)
Checking geometry...
Overall domain bounding box (-0.7 0 -0.3) (0.4 0.04 0.3)
Mesh (non-empty, non-wedge) directions (1 1 1)
Mesh (non-empty) directions (1 1 1)
Boundary openness (-3.961e-18 -1.165e-14 4.242e-15) OK.
Max cell openness = 2.453e-16 OK.
Max aspect ratio = 319.2 OK.
Minimum face area = 2.5e-07. Maximum face area = 0.000224. Face area magnitudes OK.
Min volume = 7.556e-10. Max volume = 2.708e-07. Total volume = 0.02634. Cell volumes OK.
Mesh non-orthogonality Max: 41.89 average: 7.464
Non-orthogonality check OK.
Face pyramids OK.
Max skewness = 0.7542 OK.
Coupled point location match (average 0) OK.
Mesh OK.
End
blockMeshDict: (Sorry about the weird spacing. It didn't copy & paste well.)
Code:
convertToMeters 0.1;
vertices
(
(-0.25 0 0.25) //0
(0.25 0 0.25) //1
(0.25 0 -0.25) //2
(-0.25 0 -0.25) //3
(-0.707 0 0.707) //4
(0.707 0 0.707) //5
(0.707 0 -0.707) //6
(-0.707 0 -0.707) //7
(-1.414 0 1.414) //8
(1.414 0 1.414) //9
(1.414 0 -1.414) //10
(-1.414 0 -1.414) //11
(-7 0 3) //12
(-1.414 0 3) //13
(1.414 0 3) //14
(4 0 3) //15
(-7 0 1.414) //16
(4 0 1.414) //17
(-7 0 -1.414) //18
(4 0 -1.414) //19
(-7 0 -3) //20
(-1.414 0 -3) //21
(1.414 0 -3) //22
(4 0 -3) //23
/////////////////////////////////////////////////////
(-0.25 0.02 0.25) //24
(0.25 0.02 0.25) //25
(0.25 0.02 -0.25) //26
(-0.25 0.02 -0.25) //27
(-0.707 0.02 0.707) //28
(0.707 0.02 0.707) //29
(0.707 0.02 -0.707) //30
(-0.707 0.02 -0.707) //31
(-1.414 0.02 1.414) //32
(1.414 0.02 1.414) //33
(1.414 0.02 -1.414) //34
(-1.414 0.02 -1.414) //35
(-7 0.02 3) //36
(-1.414 0.02 3) //37
(1.414 0.02 3) //38
(4 0.02 3) //39
(-7 0.02 1.414) //40
(4 0.02 1.414) //41
(-7 0.02 -1.414) //42
(4 0.02 -1.414) //43
(-7 0.02 -3) //44
(-1.414 0.02 -3) //45
(1.414 0.02 -3) //46
(4 0.02 -3) //47
/////////////////////////////////////////////////////
(-0.25 0.4 0.25) //48
(0.25 0.4 0.25) //49
(0.25 0.4 -0.25) //50
(-0.25 0.4 -0.25) //51
(-0.707 0.4 0.707) //52
(0.707 0.4 0.707) //53
(0.707 0.4 -0.707) //54
(-0.707 0.4 -0.707) //55
(-1.414 0.4 1.414) //56
(1.414 0.4 1.414) //57
(1.414 0.4 -1.414) //58
(-1.414 0.4 -1.414) //59
(-7 0.4 3) //60
(-1.414 0.4 3) //61
(1.414 0.4 3) //62
(4 0.4 3) //63
(-7 0.4 1.414) //64
(4 0.4 1.414) //65
(-7 0.4 -1.414) //66
(4 0.4 -1.414) //67
(-7 0.4 -3) //68
(-1.414 0.4 -3) //69
(1.414 0.4 -3) //70
(4 0.4 -3) //71
);
blocks
(
hex (4 5 29 28 8 9 33 32) (20 40 20) simpleGrading (1 1 1) //0
hex (6 10 34 30 5 9 33 29) (20 40 20) simpleGrading (1 1 1) //1
hex (11 10 34 35 7 6 30 31) (20 40 20) simpleGrading (1 1 1) //2
hex (11 7 31 35 8 4 28 32) (20 40 20) simpleGrading (1 1 1) //3
hex (16 8 32 40 12 13 37 36) (35 40 20) simpleGrading (1 1 1) //4
hex (8 9 33 32 13 14 38 37) (20 40 20) simpleGrading (1 1 1) //5
hex (9 17 41 33 14 15 39 38) (20 40 20) simpleGrading (1 1 1) //6
hex (18 11 35 42 16 8 32 40) (35 40 20) simpleGrading (1 1 1) //7
hex (10 19 43 34 9 17 41 33) (20 40 20) simpleGrading (1 1 1) //8
hex (20 21 45 44 18 11 35 42) (35 40 20) simpleGrading (1 1 1) //9
hex (21 22 46 45 11 10 34 35) (20 40 20) simpleGrading (1 1 1) //10
hex (22 23 47 46 10 19 43 34) (20 40 20) simpleGrading (1 1 1) //11
hex (27 26 50 51 24 25 49 48) (20 80 20) simpleGrading (1 10 1) //12
hex (24 25 49 48 28 29 53 52) (20 80 20) simpleGrading (1 10 1) //13
hex (26 30 54 50 25 29 53 49) (20 80 20) simpleGrading (1 10 1) //14
hex (31 30 54 55 27 26 50 51) (20 80 20) simpleGrading (1 10 1) //15
hex (31 27 51 55 28 24 48 52) (20 80 20) simpleGrading (1 10 1) //16
hex (28 29 53 52 32 33 57 56) (20 80 20) simpleGrading (1 10 1) //17
hex (30 34 58 54 29 33 57 53) (20 80 20) simpleGrading (1 10 1) //18
hex (35 34 58 59 31 30 54 55) (20 80 20) simpleGrading (1 10 1) //19
hex (35 31 55 59 32 28 52 56) (20 80 20) simpleGrading (1 10 1) //20
hex (40 32 56 64 36 37 61 60) (35 80 20) simpleGrading (1 10 1) //21
hex (32 33 57 56 37 38 62 61) (20 80 20) simpleGrading (1 10 1) //22
hex (33 41 65 57 38 39 63 62) (20 80 20) simpleGrading (1 10 1) //23
hex (42 35 59 66 40 32 56 64) (35 80 20) simpleGrading (1 10 1) //24
hex (34 43 67 58 33 41 65 57) (20 80 20) simpleGrading (1 10 1) //25
hex (44 45 69 68 42 35 59 66) (35 80 20) simpleGrading (1 10 1) //26
hex (45 46 70 69 35 34 58 59) (20 80 20) simpleGrading (1 10 1) //27
hex (46 47 71 70 34 43 67 58) (20 80 20) simpleGrading (1 10 1) //28
);
edges
(
arc 4 5 (0 0 1)
arc 5 6 (1 0 0)
arc 6 7 (0 0 -1)
arc 4 7 (-1 0 0)
arc 8 9 (0 0 2)
arc 9 10 (2 0 0)
arc 10 11 (0 0 -2)
arc 8 11 (-2 0 0)
arc 28 29 (0 0.02 1)
arc 29 30 (1 0.02 0)
arc 30 31 (0 0.02 -1)
arc 28 31 (-1 0.02 0)
arc 32 33 (0 0.02 2)
arc 33 34 (2 0.02 0)
arc 34 35 (0 0.02 -2)
arc 32 35 (-2 0.02 0)
arc 52 53 (0 0.4 1)
arc 53 54 (1 0.4 0)
arc 54 55 (0 0.4 -1)
arc 52 55 (-1 0.4 0)
arc 56 57 (0 0.4 2)
arc 57 58 (2 0.4 0)
arc 58 59 (0 0.4 -2)
arc 56 59 (-2 0.4 0)
);
boundary
(
inlet
{
type patch;
faces
(
(12 36 40 16)
(16 40 42 18)
(18 42 44 20)
);
}
outlet
{
type patch;
faces
(
(23 47 43 19)
(19 43 41 17)
(17 41 39 15)
(47 71 67 43)
(43 67 65 41)
(41 65 63 39)
);
}
leftWall
{
type symmetryPlane;
faces
(
(20 44 45 21)
(21 45 46 22)
(22 46 47 23)
(44 68 69 45)
(45 69 70 46)
(46 70 71 47)
);
}
rightWall
{
type symmetryPlane;
faces
(
(15 39 38 14)
(14 38 37 13)
(13 37 36 12)
(39 63 62 38)
(38 62 61 37)
(37 61 60 36)
);
}
upperWall
{
type symmetryPlane;
faces
(
(61 56 64 60)
(62 57 56 61)
(63 65 57 62)
(56 59 66 64)
(65 67 58 57)
(59 69 68 66)
(58 70 69 59)
(67 71 70 58)
(57 53 52 56)
(57 58 54 53)
(54 58 59 55)
(52 55 59 56)
(53 49 48 52)
(53 54 50 49)
(50 54 55 51)
(48 51 55 52)
(49 50 51 48)
);
}
lowerWall
{
type wall;
faces
(
(12 16 8 13)
(13 8 9 14)
(14 9 17 15)
(16 18 11 8)
(9 10 19 17)
(18 20 21 11)
(11 21 22 10)
(10 22 23 19)
(8 4 5 9)
(5 6 10 9)
(7 11 10 6)
(8 11 7 4)
);
}
cylWall
{
type wall;
faces
(
(6 30 31 7)
(5 29 30 6)
(5 29 28 4)
(7 31 28 4)
);
}
cylTop
{
type wall;
faces
(
(28 24 25 29)
(25 26 30 29)
(27 31 30 26)
(28 31 27 24)
(24 27 26 25)
);
}
trip
{
type wall;
faces
(
(36 60 64 40)
(40 64 66 42)
(42 66 68 44)
);
}
);
mergePatchPairs
(
);
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