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Old   September 27, 2009, 22:33
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Hi All,
I am using fluent3DMeshToFoam to convert fully tetra *.msh file to OF_1.6. When I use polyDualMesh 80 to convert tetra to polyhedral, it increase my cell count for example from 65579 to 262316. Why this happen? It suppose to reduce my cell count. It happen to all my msh file regardless of how big the cell count is.
Another question is, after I run meshCheck with my tetra mesh, it show my minimum face area and volume is extremely small. Why this happen? When I check in ANSA, the minumum length of my mesh is on 3mm. I attach the checkMesh output at below.
Please help!

Checking geometry...
Overall domain bounding box (-0.02 -0.02 -0.02) (0.23 0.23 0.23)
Mesh (non-empty, non-wedge) directions (1 1 1)
Mesh (non-empty) directions (1 1 1)
Boundary openness (-5.55567e-18 1.43518e-17 1.8904e-17) OK.
Max cell openness = 2.68989e-16 OK.
Max aspect ratio = 5.5672 OK.
Minumum face area = 2.35896e-06. Maximum face area = 0.000305596. Face area magnitudes OK.
Min volume = 2.60873e-09. Max volume = 1.65414e-06. Total volume = 0.0155. Cell volumes OK.
Mesh non-orthogonality Max: 58.5029 average: 15.0529
Non-orthogonality check OK.
Face pyramids OK.
Max skewness = 0.640031 OK.

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airfoil
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Old   September 28, 2009, 12:40
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Quote:
Originally Posted by airfoil View Post
Hi All,
I am using fluent3DMeshToFoam to convert fully tetra *.msh file to OF_1.6. When I use polyDualMesh 80 to convert tetra to polyhedral, it increase my cell count for example from 65579 to 262316. Why this happen? It suppose to reduce my cell count. It happen to all my msh file regardless of how big the cell count is.
Cell count according to whom? checkMesh or paraview? Paraview is wrong. Have a look in checkMesh how many cells are tetraheder and how many are polyeders

Quote:
Originally Posted by airfoil View Post
Another question is, after I run meshCheck with my tetra mesh, it show my minimum face area and volume is extremely small. Why this happen? When I check in ANSA, the minumum length of my mesh is on 3mm. I attach the checkMesh output at below.
Please help!

Checking geometry...
Overall domain bounding box (-0.02 -0.02 -0.02) (0.23 0.23 0.23)
Mesh (non-empty, non-wedge) directions (1 1 1)
Mesh (non-empty) directions (1 1 1)
Boundary openness (-5.55567e-18 1.43518e-17 1.8904e-17) OK.
Max cell openness = 2.68989e-16 OK.
Max aspect ratio = 5.5672 OK.
Minumum face area = 2.35896e-06. Maximum face area = 0.000305596. Face area magnitudes OK.
Min volume = 2.60873e-09. Max volume = 1.65414e-06. Total volume = 0.0155. Cell volumes OK.
Mesh non-orthogonality Max: 58.5029 average: 15.0529
Non-orthogonality check OK.
Face pyramids OK.
Max skewness = 0.640031 OK.
I don't understand your problem. If you take 3mm squared and to the power of three you're within a factor of 10 of the reported values
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Old   September 28, 2009, 18:17
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Hi Bernhard,
 Thank you for replying. May I know what is the default unit length for fluent? What I did was, I mesh surface mesh using Ansa. Then I generate tetrahedral mesh with ANSA Tetra-FEM. Later I output the surface mesh and tetra to Fluent .msh ASCII. The *.msh contains surface mesh for boundary patch. When converting to OpenFOAM, I use fluent3DMeshToFoam *.msh -scale 0.001 because my mesh in ANSA is mm unit but dimensional unit for OpenFOAM is meter. That is why I use -scale 0.001.
What is your opinion on this?
Another question, why when I convert to polydualMesh, my cell count will increase? I view it using paraview and my polyhedral cell become finer as compare to tetras. Why is this happen?

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Old   September 30, 2009, 19:39
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Quote:
Originally Posted by airfoil View Post
Hi Bernhard,
 Thank you for replying. May I know what is the default unit length for fluent? What I did was, I mesh surface mesh using Ansa. Then I generate tetrahedral mesh with ANSA Tetra-FEM. Later I output the surface mesh and tetra to Fluent .msh ASCII. The *.msh contains surface mesh for boundary patch. When converting to OpenFOAM, I use fluent3DMeshToFoam *.msh -scale 0.001 because my mesh in ANSA is mm unit but dimensional unit for OpenFOAM is meter. That is why I use -scale 0.001.
What is your opinion on this?
Another question, why when I convert to polydualMesh, my cell count will increase? I view it using paraview and my polyhedral cell become finer as compare to tetras. Why is this happen?
Because AFAIK paraview decomposes the polyeders into tetraheder before showing them to you. The only real measure for the cell count is checkMesh
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Old   September 30, 2009, 22:51
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Hi Bernhard,
Thank you for the reply. I don't what is wrong with my mesh. Since then, I had abandon the desire to use fluent3DMeshToFoam. Now I am using ANSA 13 to output my delaunay mesh directly to OF then i do polyDualMesh 80 to convert tetrahedral to polyhedral. However there is an error when I do check mesh.

Checking geometry...
Overall domain bounding box (-5 -1 -0.194) (10 1 1.80605)
Mesh (non-empty, non-wedge) directions (1 1 1)
Mesh (non-empty) directions (1 1 1)
Boundary openness (8.54096e-18 8.41637e-18 -9.16634e-16) OK.
Max cell openness = 2.84773e-16 OK.
Max aspect ratio = 4.67014 OK.
Minumum face area = 2.60311e-07. Maximum face area = 0.0145859. Face area magnitudes OK.
Min volume = 3.41079e-09. Max volume = 0.00201841. Total volume = 59.8916. Cell volumes OK.
Mesh non-orthogonality Max: 47.9936 average: 10.0362
Non-orthogonality check OK.
***Error in face pyramids: 362 faces are incorrectly oriented.
<<Writing 362 faces with incorrect orientation to set wrongOrientedFaces
Max skewness = 1.89527 OK.

May I know what is wrongOrientedFaces mean?

Rgds,
Airfoil
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Old   October 9, 2009, 04:21
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Just a question.

Did you checkMesh the OpenFOAM mesh output from ANSA
prior to poly conversion?
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Old   October 13, 2009, 04:53
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Hi Vangelis,
When I output the mesh from Ansa, it is in tetra. So there is no error when I do checkMesh.
I noticed when I increase the split angle more then 90 deg, it will have no error but the edges is gone. From the other thread http://www.cfd-online.com/Forums/ope...eneration.html, Lillberg mentioned that the angle should be smaller then 90 deg and 45-80 is the best angle. This is true for STAR-CD as well.
Please have a look on the attachment picture. The edge is gone for Poly_95.png. If I do polyDualmesh with 75 degree, the edge is kept but always have zero points error. Could some one please explain this? Appreciate!
Attached Images
File Type: jpg poly_75.jpg (95.6 KB, 87 views)
File Type: jpg poly_95.jpg (77.5 KB, 85 views)
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Old   October 13, 2009, 06:31
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Hi airfoil,

I would expect that the required feature angle for the conversion should be lower, say 15 or 20 deg, in order to maintain the features of the model.

Have you tried with such values?
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Old   October 13, 2009, 07:30
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Hi Vangelis,
I try to use 15 deg and there is error in face pyramid. I attach the checkMesh result below.

lnx1762-014:ll13466> polyDualMesh 15
/*---------------------------------------------------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 1.6 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
Build : 1.6-f802ff2d6c5a
Exec : polyDualMesh 15
Date : Oct 13 2009
Time : 13:13:45
Host : lnx1762-014
PID : 1579
Case : /users/ll13466/training/openfoam/ahmed/35deg/ansa6
nProcs : 1
SigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time

Create mesh for time = 0

// using new solver syntax:
p
{
solver GAMG;
preconditioner GAMG;
tolerance 0.0001;
relTol 0;
smoother GaussSeidel;
nPreSweeps 0;
nPostSweeps 2;
pFinestSweeps 2;
cacheAgglomeration true;
nCellsInCoarsestLevel 100;
agglomerator faceAreaPair;
mergeLevels 1;
}

// using new solver syntax:
U
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-06;
relTol 0;
}

// using new solver syntax:
k
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-06;
relTol 0;
}

// using new solver syntax:
epsilon
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-06;
relTol 0;
}

// using new solver syntax:
R
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-06;
relTol 0;
}

// using new solver syntax:
nuTilda
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-06;
relTol 0;
}

Feature:15
minCos :0.965926

Dumping centres of featureFaces to obj file "featureFaces.obj"
Dumping featureEdges to obj file "featureEdges.obj"
Dumping featurePoints that become a single cell to obj file "singleCellFeaturePoints.obj"
Dumping featurePoints that become multiple cells to obj file "multiCellFeaturePoints.obj"
Reading volScalarField p
Reading volScalarField k
Reading volScalarField epsilon
Reading volScalarField nuTilda
Reading volVectorField U
Reading volSymmTensorField R
Writing dual mesh to 1
End

[/users/ll13466/training/openfoam/ahmed/35deg/ansa6] [13:16] [13.Oct] lnx1762-014:ll13466> checkMesh
/*---------------------------------------------------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 1.6 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
Build : 1.6-f802ff2d6c5a
Exec : checkMesh
Date : Oct 13 2009
Time : 13:17:16
Host : lnx1762-014
PID : 1610
Case : /users/ll13466/training/openfoam/ahmed/35deg/ansa6
nProcs : 1
SigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time

Create polyMesh for time = 0

Time = 0

Mesh stats
points: 620905
faces: 7055740
internal faces: 6875276
cells: 3482754
boundary patches: 6
point zones: 0
face zones: 0
cell zones: 0

Overall number of cells of each type:
hexahedra: 0
prisms: 0
wedges: 0
pyramids: 0
tet wedges: 0
tetrahedra: 3482754
polyhedra: 0

Checking topology...
Boundary definition 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 928 505 ok (non-closed singly connected)
outlet 928 505 ok (non-closed singly connected)
ground 37936 19141 ok (non-closed singly connected)
ground_slip 1386 744 ok (non-closed singly connected)
top_side 20726 10574 ok (non-closed singly connected)
car 118560 59314 ok (non-closed singly connected)

Checking geometry...
Overall domain bounding box (-5 -1 -0.194) (10 1 1.80605)
Mesh (non-empty, non-wedge) directions (1 1 1)
Mesh (non-empty) directions (1 1 1)
Boundary openness (9.31633e-18 1.03805e-17 1.11654e-15) OK.
Max cell openness = 3.08056e-16 OK.
Max aspect ratio = 7.61779 OK.
Minumum face area = 3.482e-06. Maximum face area = 0.00930381. Face area magnitudes OK.
Min volume = 2.63917e-09. Max volume = 0.000275506. Total volume = 59.8916. Cell volumes OK.
Mesh non-orthogonality Max: 60.8783 average: 14.6742
Non-orthogonality check OK.
Face pyramids OK.
Max skewness = 0.802059 OK.

Mesh OK.

Time = 1

Mesh stats
points: 3677823
faces: 4297096
internal faces: 4193893
cells: 620905
boundary patches: 6
point zones: 0
face zones: 0
cell zones: 0

Overall number of cells of each type:
hexahedra: 0
prisms: 0
wedges: 0
pyramids: 0
tet wedges: 0
tetrahedra: 0
polyhedra: 620905

Checking topology...
Boundary definition 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 661 1244 ok (non-closed singly connected)
outlet 661 1244 ok (non-closed singly connected)
ground 19854 39353 ok (non-closed singly connected)
ground_slip 940 1782 ok (non-closed singly connected)
top_side 12904 24192 ok (non-closed singly connected)
car 68183 128361 ok (non-closed singly connected)

Checking geometry...
Overall domain bounding box (-5 -1 -0.194) (10 1 1.80605)
Mesh (non-empty, non-wedge) directions (1 1 1)
Mesh (non-empty) directions (1 1 1)
Boundary openness (1.57636e-17 7.8324e-18 1.4391e-15) OK.
Max cell openness = 2.53783e-16 OK.
Max aspect ratio = 4.59728 OK.
Minumum face area = 5.31351e-07. Maximum face area = 0.0141903. Face area magnitudes OK.
Min volume = 9.34748e-09. Max volume = 0.00192506. Total volume = 59.8916. Cell volumes OK.
Mesh non-orthogonality Max: 47.3134 average: 9.77624
Non-orthogonality check OK.
***Error in face pyramids: 182 faces are incorrectly oriented.
<<Writing 182 faces with incorrect orientation to set wrongOrientedFaces
Max skewness = 1.65935 OK.

Failed 1 mesh checks.

End

There is no problem with my tetras. I am using Ansa to generate Delaunay tetra which is the must for polyDualMesh.
Have a look on the picture. It maintained the edges very well and split into small mesh at the edge.
Anything else I can do?
Attached Images
File Type: jpg poly_15.jpg (89.9 KB, 53 views)
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Old   October 13, 2009, 08:34
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Sorry airfoil,
I cannot think of anything, apart from trying to run the solver
regardless of the errors in checkMesh

Could you at least visualize the set wrongOrientedFaces?
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Old   October 15, 2009, 04:26
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Vengelis,
Sorry. How to view the problem faces in paraview? The error set is as below.

/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 1.6 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class faceSet;
location "constant/polyMesh/sets";
object wrongOrientedFaces;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //


182
(
4260149
4260150
4260151
4261475
4261476
4261479
4261480
4262839
4262840
4262841
4263087
4263088
4263089
4263166
4263167
4263168
4263432
4263433
4263434
4264256
4264257
4264258
4264638
4264639
4264643
4265533
4265534
4265535
4266285
4266286
4266287
4267482
4267486
4267487
4269089
4269090
4269091
4269176
4269177
4269178
4270103
4270104
4270105
4270179
4270180
4271025
4271026
4271030
4273857
4273858
4273859
4274338
4274342
4274343
4276672
4276673
4276674
4276937
4276938
4276939
4277862
4277863
4277864
4278247
4278248
4278249
4279102
4279103
4279104
4279173
4279174
4279175
4279202
4279206
4279207
4279643
4279644
4279648
4279651
4279652
4279656
4283956
4283957
4283958
4287369
4287370
4287371
4289046
4289047
4289048
4289049
4291614
4291615
4291619
4228997
4228998
4228999
4231308
4231309
4231310
4298022
4298023
4298024
4233074
4233075
4233076
4233133
4233134
4233135
4233210
4233211
4233212
4233930
4233931
4233932
4234168
4234169
4234170
4235677
4235678
4235679
4235925
4235929
4235930
4235971
4235972
4235973
4237542
4237543
4237544
4237676
4237677
4237678
4237679
4237997
4237998
4237999
4238234
4238235
4238236
4238241
4238242
4238243
4238716
4238717
4238718
4239406
4239410
4239411
4241399
4241400
4241401
4242815
4242816
4242817
4243471
4243472
4243473
4245487
4245488
4245489
4245490
4245494
4245495
4252018
4252019
4252020
4256099
4256103
4256104
4256506
4256507
4256508
4257825
4257826
4257827
4258162
4258163
4258164
4258270
4258271
4258275
)

// ************************************************** *********************** //
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Old   October 16, 2009, 06:07
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Quote:
Originally Posted by airfoil View Post
Vengelis,
Sorry. How to view the problem faces in paraview? The error set is as below.

/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 1.6 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class faceSet;
location "constant/polyMesh/sets";
object wrongOrientedFaces;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //


182
(
4260149
4260150
At first: Thanks for sharing all these numbers with us

How to: In paraFoam check "Include Sets" then check the set in question in the list (where the patches are). Afterwards select the set in the "Extract Block"-filter
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Old   October 25, 2009, 11:12
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Bernhard,
Thank you for the guide. There are problem with the mesh when viewing in Paraview. Does OF have any utility which I can fix the mesh manually?
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Old   November 18, 2011, 23:46
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Hi all!

I don't know extracly your mesh is 3D or 2D
but if Your mesh is 3D I don't see how many cell it is. I have same problem when convert a cube in Gambit to OpenFoam - But don't see the number of cell created - althought Face and Point are good.

Who can give me some advice !!!!
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Old   November 19, 2011, 03:11
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use checkMesh utility
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Old   November 19, 2011, 05:43
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This is my cellzone file - it has only information which isn't like cell file in example ... Can you explain meaning of this file for me ???
I tranformed it from Gambit to OpenFoam Mesh - it's my result file cellzone
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Old   November 19, 2011, 06:22
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Read the header of constant/polymesh/owner file.
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Old   November 19, 2011, 10:00
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Thank you very much
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Old   November 19, 2011, 19:57
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Your cell number is 125
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Old   March 25, 2012, 08:36
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I now face the same trouble with the fluent3dmeshtofoam,i get the .cas format file,when i execute fluent3dmeshtofoam,i get the error:--> FOAM FATAL ERROR:
Do not understand characters: /
on line 157058

From function fluentMeshToFoam::lexer
in file fluent3DMeshToFoam.L at line 747.

FOAM exiting
Can you help me if you are free?
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