CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Meshing & Mesh Conversion

[Commercial meshers] Problems with ANSYS mesh conversion

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 31, 2016, 18:31
Default Problems with ANSYS mesh conversion
  #1
New Member
 
Thomas A
Join Date: Mar 2016
Posts: 18
Rep Power: 10
tdog is on a distinguished road
Hi
I'm new to the forum and relatively new to OpenFoam. I'm trying to create a mesh from an ANSYS mesh file. I have done the following.
I've made a structure using SolidWorks, saving it as .sldprt and then importing it to Workbench. I meshed the structure and then made named selections for all of the surfaces, I then changed the options for the .msh to use ASCII formating and then exported the mesh as .msh.

When I run the fluentMeshToFoam command in OpenFoam I get the following output. In the output it says that it "Found 12208 undefined faces in mesh; adding to default patch.
done.
" which I don't understand, I don't know how to do it any other way. In order to make sure the mesh was in fact bad, I also ran checkMesh, which is the second output - it gave two errors. From what I understand from the errors, it's a bad mesh, but in what way should I change it?
I've attached my .msh, .sldprt and Workbench project file as a zip in the following link.
I hope you guys can help :-)
https://www.dropbox.com/s/bykl259mvq...sign1.zip?dl=0
Code:
bash-4.1$ fluentMeshToFoam abc.msh
/*---------------------------------------------------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v3.0+                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
Build  : v3.0+-e941ee6c15e9
Exec   : fluentMeshToFoam abc.msh
Date   : Mar 30 2016
Time   : 13:49:04
Host   : "a531e13bda1b"
PID    : 187
Case   : /Users/thomasagger/Dropbox/00001/square
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster
allowSystemOperations : Allowing user-supplied system call operations

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

Embedded blocks in comment or unknown:       (
Embedded blocks in comment or unknown:(
Found end of section in unknown:) 
Embedded blocks in comment or unknown:(
Found end of section in unknown:)
Found end of section in unknown:)
Embedded blocks in comment or unknown:       (
Embedded blocks in comment or unknown:(
Found end of section in unknown:)
Embedded blocks in comment or unknown:
                (
Found end of section in unknown:)
Found end of section in unknown:)
Embedded blocks in comment or unknown:       (
Embedded blocks in comment or unknown:(
Found end of section in unknown:)
Found end of section in unknown:)
Embedded blocks in comment or unknown: (
Embedded blocks in comment or unknown:(
Found end of section in unknown:) 
Embedded blocks in comment or unknown:(
Found end of section in unknown:)
Found end of section in unknown:)
Dimension of grid: 3
Number of points: 7826

number of faces: 58998
Number of cells: 26447
Reading points
Reading points
Reading uniform faces
Reading uniform faces
Reading uniform faces
Reading uniform faces
Reading uniform faces
Reading uniform faces
Reading uniform faces
Other readCellGroupData: 2 1 674f 1 2
Reading uniform cells
Read zone1:1 name:interior-design1 patchTypeID:interior
Reading zone data
Read zone1:2 name:design1 patchTypeID:fluid
Reading zone data
Read zone1:5 name:movingwall patchTypeID:wall
Reading zone data
Read zone1:6 name:fixedwall patchTypeID:wall
Reading zone data
Read zone1:7 name:inlet patchTypeID:velocity-inlet
Reading zone data
Read zone1:8 name:cyclic1 patchTypeID:wall
Reading zone data
Read zone1:9 name:cyclic2 patchTypeID:wall
Reading zone data
Read zone1:10 name:out patchTypeID:pressure-outlet
Reading zone data


FINISHED LEXING


dimension of grid: 3
Creating shapes for 3-D cells
Building patch-less mesh...--> FOAM Warning : 
    From function Foam::polyMesh::polyMesh(const Foam::IOobject&, const Foam::Xfer<Foam::Field<Foam::Vector<double> > >&, const cellShapeList&, const faceListList&, const wordList&, const wordList&, const Foam::word&, const Foam::word&, const wordList&, bool)
    in file meshes/polyMesh/polyMeshFromShapeMesh.C at line 596
    Found 12208 undefined faces in mesh; adding to default patch.
done.

Building boundary and internal patches.
Creating patch 0 for zone: 1 start: 1 end: 46790 type: interior name: interior-design1
Creating patch 1 for zone: 5 start: 46791 end: 50948 type: wall name: movingwall
Creating patch 2 for zone: 6 start: 50949 end: 57529 type: wall name: fixedwall
Creating patch 3 for zone: 7 start: 57530 end: 57573 type: velocity-inlet name: inlet
Creating patch 4 for zone: 8 start: 57574 end: 57887 type: wall name: cyclic1
Creating patch 5 for zone: 9 start: 57888 end: 57929 type: wall name: cyclic2
Creating patch 6 for zone: 10 start: 57930 end: 58998 type: pressure-outlet name: out
Patch interior-design1 is internal to the mesh  and is not being added to the boundary.
Adding new patch movingwall of type wall as patch 0
Adding new patch fixedwall of type wall as patch 1
Adding new patch inlet of type patch as patch 2
Adding new patch cyclic1 of type wall as patch 3
Adding new patch cyclic2 of type wall as patch 4
Adding new patch out of type patch as patch 5

Writing mesh... to "constant/polyMesh"  done.


End
Code:
bash-4.1$ checkMesh
/*---------------------------------------------------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v3.0+                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
Build  : v3.0+-e941ee6c15e9
Exec   : checkMesh
Date   : Mar 30 2016
Time   : 13:53:28
Host   : "a531e13bda1b"
PID    : 188
Case   : /Users/thomasagger/Dropbox/00001/square
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster
allowSystemOperations : Allowing user-supplied system call operations

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

Create polyMesh for time = 0

Time = 0

Mesh stats
    points:           7826
    internal points:  1720
    faces:            58998
    internal faces:   46790
    cells:            26447
    faces per cell:   4
    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:    26447
    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                  
    movingwall          4158     2429     ok (non-closed singly connected)  
    fixedwall           6581     3677     ok (non-closed singly connected)  
    inlet               44       44       ok (non-closed singly connected)  
    cyclic1             314      316      ok (non-closed singly connected)  
    cyclic2             42       44       ok (non-closed singly connected)  
    out                 1069     1073     ok (non-closed singly connected)  

Checking geometry...
    Overall domain bounding box (-0.05783 -2.02804e-16 -0.02) (0.06783 0.0187325 0.02)
    Mesh has 3 geometric (non-empty/wedge) directions (1 1 1)
    Mesh has 3 solution (non-empty) directions (1 1 1)
    Boundary openness (-1.36456e-19 -8.41151e-16 1.95199e-19) OK.
 ***High aspect ratio cells found, Max aspect ratio: 5789.09, number of cells 780
  <<Writing 780 cells with high aspect ratio to set highAspectRatioCells
    Minimum face area = 4.7198e-12. Maximum face area = 3.30474e-06.  Face area magnitudes OK.
    Min volume = 3.19826e-18. Max volume = 4.27022e-10.  Total volume = 3.26707e-07.  Cell volumes OK.
    Mesh non-orthogonality Max: 89.917 average: 53.0697
   *Number of severely non-orthogonal (> 70 degrees) faces: 17540.
    Non-orthogonality check OK.
  <<Writing 17540 non-orthogonal faces to set nonOrthoFaces
    Face pyramids OK.
 ***Max skewness = 5.87506, 3 highly skew faces detected which may impair the quality of the results
  <<Writing 3 skew faces to set skewFaces
    Coupled point location match (average 0) OK.

Failed 2 mesh checks.

End
tdog is offline   Reply With Quote

Old   March 31, 2016, 18:36
Default
  #2
New Member
 
Thomas A
Join Date: Mar 2016
Posts: 18
Rep Power: 10
tdog is on a distinguished road
I just read the sticky note and then tried the Fluent3DMeshToFoam which seems to give less problems as seen in the attached output. But when I run the checkMesh I get the same errors, see attached output
Code:
bash-4.1$ fluent3DMeshToFoam design1.msh
/*---------------------------------------------------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v3.0+                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
Build  : v3.0+-e941ee6c15e9
Exec   : fluent3DMeshToFoam design1.msh
Date   : Mar 31 2016
Time   : 21:33:50
Host   : "a531e13bda1b"
PID    : 195
Case   : /Users/thomasagger/Dropbox/00001/square
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster
allowSystemOperations : Allowing user-supplied system call operations

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

Dimension of grid: 3
Number of points: 7826
Number of faces: 58998
Number of cells: 26447
PointGroup: 3 start: 0 end: 1719.  Reading points...done.
PointGroup: 4 start: 1720 end: 7825.  Reading points...done.
FaceGroup: 1 start: 0 end: 46789.  Reading uniform faces...done.
FaceGroup: 5 start: 46790 end: 50947.  Reading uniform faces...done.
FaceGroup: 6 start: 50948 end: 57528.  Reading uniform faces...done.
FaceGroup: 7 start: 57529 end: 57572.  Reading uniform faces...done.
FaceGroup: 8 start: 57573 end: 57886.  Reading uniform faces...done.
FaceGroup: 9 start: 57887 end: 57928.  Reading uniform faces...done.
FaceGroup: 10 start: 57929 end: 58997.  Reading uniform faces...done.
CellGroup: 2 start: 0 end: 26446 type: 1
Zone: 1 name: interior-design1 type: interior.  Reading zone data...done.
Zone: 2 name: design1 type: fluid.  Reading zone data...done.
Zone: 5 name: movingwall type: wall.  Reading zone data...done.
Zone: 6 name: fixedwall type: wall.  Reading zone data...done.
Zone: 7 name: inlet type: velocity-inlet.  Reading zone data...done.
Zone: 8 name: cyclic1 type: wall.  Reading zone data...done.
Zone: 9 name: cyclic2 type: wall.  Reading zone data...done.
Zone: 10 name: out type: pressure-outlet.  Reading zone data...done.

FINISHED LEXING

Creating patch 0 for zone: 5 name: movingwall type: wall
Creating patch 1 for zone: 6 name: fixedwall type: wall
Creating patch 2 for zone: 7 name: inlet type: velocity-inlet
Creating patch 3 for zone: 8 name: cyclic1 type: wall
Creating patch 4 for zone: 9 name: cyclic2 type: wall
Creating patch 5 for zone: 10 name: out type: pressure-outlet
Creating cellZone 0 name: design1 type: fluid
Creating faceZone 0 name: interior-design1 type: interior
faceZone from Fluent indices: 0 to: 46789 type: interior
patch 0 from Fluent indices: 46790 to: 50947 type: wall
patch 1 from Fluent indices: 50948 to: 57528 type: wall
patch 2 from Fluent indices: 57529 to: 57572 type: velocity-inlet
patch 3 from Fluent indices: 57573 to: 57886 type: wall
patch 4 from Fluent indices: 57887 to: 57928 type: wall
patch 5 from Fluent indices: 57929 to: 58997 type: pressure-outlet

Writing mesh to "/Users/thomasagger/Dropbox/00001/square/constant/region0"

End
Code:
bash-4.1$ checkMesh
/*---------------------------------------------------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v3.0+                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
Build  : v3.0+-e941ee6c15e9
Exec   : checkMesh
Date   : Mar 31 2016
Time   : 21:34:16
Host   : "a531e13bda1b"
PID    : 196
Case   : /Users/thomasagger/Dropbox/00001/square
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster
allowSystemOperations : Allowing user-supplied system call operations

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

Create polyMesh for time = 0

Time = 0

Mesh stats
    points:           7826
    internal points:  1720
    faces:            58998
    internal faces:   46790
    cells:            26447
    faces per cell:   4
    boundary patches: 6
    point zones:      0
    face zones:       1
    cell zones:       1

Overall number of cells of each type:
    hexahedra:     0
    prisms:        0
    wedges:        0
    pyramids:      0
    tet wedges:    0
    tetrahedra:    26447
    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                  
    movingwall          4158     2429     ok (non-closed singly connected)  
    fixedwall           6581     3677     ok (non-closed singly connected)  
    inlet               44       44       ok (non-closed singly connected)  
    cyclic1             314      316      ok (non-closed singly connected)  
    cyclic2             42       44       ok (non-closed singly connected)  
    out                 1069     1073     ok (non-closed singly connected)  

Checking geometry...
    Overall domain bounding box (-0.05783 -2.02804e-16 -0.02) (0.06783 0.0187325 0.02)
    Mesh has 3 geometric (non-empty/wedge) directions (1 1 1)
    Mesh has 3 solution (non-empty) directions (1 1 1)
    Boundary openness (1.65459e-18 -3.97844e-15 4.77899e-18) OK.
 ***High aspect ratio cells found, Max aspect ratio: 5789.09, number of cells 780
  <<Writing 780 cells with high aspect ratio to set highAspectRatioCells
    Minimum face area = 4.7198e-12. Maximum face area = 3.30474e-06.  Face area magnitudes OK.
    Min volume = 3.19826e-18. Max volume = 4.27022e-10.  Total volume = 3.26707e-07.  Cell volumes OK.
    Mesh non-orthogonality Max: 89.917 average: 53.0697
   *Number of severely non-orthogonal (> 70 degrees) faces: 17540.
    Non-orthogonality check OK.
  <<Writing 17540 non-orthogonal faces to set nonOrthoFaces
    Face pyramids OK.
 ***Max skewness = 5.87506, 3 highly skew faces detected which may impair the quality of the results
  <<Writing 3 skew faces to set skewFaces
    Coupled point location match (average 0) OK.

Failed 2 mesh checks.

End
tdog is offline   Reply With Quote

Reply

Tags
ansys, mesh 3d, openfoam, workbench mesh

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
[ICEM] Problems with coedge curves and surfaces tommymoose ANSYS Meshing & Geometry 6 December 1, 2020 12:12
[Commercial meshers] SolidWorks to ANSYS to OpenFoam mesh conversion failed nuclear_swapnil OpenFOAM Meshing & Mesh Conversion 1 October 11, 2017 01:38
Gambit problems Althea FLUENT 22 January 4, 2017 04:19
[snappyHexMesh] snappyHexMesh won't work - zeros everywhere! sc298 OpenFOAM Meshing & Mesh Conversion 2 March 27, 2011 22:11
How to control Minximum mesh space? hung FLUENT 7 April 18, 2005 10:38


All times are GMT -4. The time now is 11:32.