CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > OpenFOAM Other Meshers: ICEM, Star, Ansys, Pointwise, GridPro, Ansa, ...

Failed 1 mesh checks

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

Reply
 
LinkBack Thread Tools Display Modes
Old   June 9, 2011, 09:47
Default Failed 1 mesh checks
  #1
New Member
 
Join Date: Apr 2011
Location: Magdeburg, Germany
Posts: 23
Rep Power: 6
Nico A. is on a distinguished road
Hello everybody,

I want to simulate the flow around a sphere. For that, I created the mesh in Gambit which looks quite good to me. Then I converted the mesh with fluent3DMeshToFoam with OpenFOAM 1.7.0.
By using checkMesh, I got the following message which I can't interpret:
Code:
Create time

Create polyMesh for time = 0

Time = 0

Mesh stats
    points:           138112
    faces:            400500
    internal faces:   387000
    cells:            131250
    boundary patches: 4
    point zones:      0
    face zones:       1
    cell zones:       1

Overall number of cells of each type:
    hexahedra:     131142
    prisms:        0
    wedges:        0
    pyramids:      0
    tet wedges:    0
    tetrahedra:    0
    polyhedra:     108

Checking topology...
    Boundary definition OK.
    Point usage OK.
  <<Found 27 neighbouring cells with multiple inbetween faces.
    Upper triangular ordering OK.
  <<Writing 54 unordered faces to set upperTriangularFace
    Face vertices OK.
    Number of regions: 1 (OK).

Checking patch topology for multiply connected surfaces ...
    Patch               Faces    Points   Surface topology                  
    outlet              625      676      ok (non-closed singly connected)  
    rest                8500     8600     ok (non-closed singly connected)  
    cylinder            3750     3752     ok (closed singly connected)      
    inlet               625      676      ok (non-closed singly connected)  

Checking geometry...
    Overall domain bounding box (0 0 0) (8 2 2)
    Mesh (non-empty, non-wedge) directions (1 1 1)
    Mesh (non-empty) directions (1 1 1)
    Boundary openness (-9.45575e-17 -2.58425e-18 -7.56937e-18) OK.
 ***Open cells found, max cell openness: 0.878109, number of open cells 108
  <<Writing 108 non closed cells to set nonClosedCells
    Minumum face area = 8.6151e-05. Maximum face area = 0.0105716.  Face area magnitudes OK.
    Min volume = 1.37781e-06. Max volume = 0.000845729.  Total volume = 31.9665.  Cell volumes OK.
    Mesh non-orthogonality Max: 53.2154 average: 19.1478
    Non-orthogonality check OK.
    Face pyramids OK.
    Max skewness = 1.02786 OK.

Failed 1 mesh checks.

End
Actually I created a structured grid in Gambit, but looking at it in ParaView there are some unstructured parts after the conversion, as written above.
I also tried to import the mesh into Fluent and I got an error: Null Domain Pointer.

Does anyone have a clue?
With kind regards, Nico
Nico A. is offline   Reply With Quote

Old   June 10, 2011, 01:59
Default
  #2
Super Moderator
 
-mAx-'s Avatar
 
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 2,965
Rep Power: 30
-mAx- will become famous soon enough
try with fluentMeshToFoam
Paraview issue, is just a graphic bug.
But if you cannot import your grid in fluent, I assume there is someting wrong.
no warning while exporting your mesh from gambit?
__________________
In memory of my friend Hervé: CFD engineer & freerider
-mAx- is offline   Reply With Quote

Old   June 10, 2011, 04:14
Default
  #3
New Member
 
Join Date: Apr 2011
Location: Magdeburg, Germany
Posts: 23
Rep Power: 6
Nico A. is on a distinguished road
I checked the mesh in Gambit and everything was fine, also no errror while exporting.
With fluentMeshToFoam I got the following:
Code:
Create time

Dimension of grid: 3
Number of points: 138112
Reading points
number of faces: 400500
Reading mixed faces
Reading mixed faces
Reading mixed faces
Reading mixed faces
Reading mixed faces
Number of cells: 131250
Other readCellGroupData: 2 1 200b2 1 4
Reading uniform cells
Read zone1:2 name:fluid patchTypeID:fluid
Reading zone data
Read zone1:3 name:outlet patchTypeID:pressure-outlet
Reading zone data
Read zone1:4 name:rest patchTypeID:symmetry
Reading zone data
Read zone1:5 name:cylinder patchTypeID:wall
Reading zone data
Read zone1:6 name:inlet patchTypeID:velocity-inlet
Reading zone data
Read zone1:8 name:default-interior patchTypeID:interior
Reading zone data


FINISHED LEXING


dimension of grid: 3
Creating shapes for 3-D cells


--> FOAM FATAL ERROR: 
Cannot find match for face 5.
Model: hex model face: 4(1 2 6 5) Mesh faces: 
6
(
4(4586 4610 4609 4585)
4(4609 4585 4586 4610)
4(4585 20031 20607 4586)
4(20583 4610 4586 20607)
4(20031 4585 4609 20007)
4(4610 20583 20007 4609)
)
Matched points: 8(4586 20607 20031 4585 4610 20583 20007 4609)

    From function create3DCellShape(const label cellIndex, const labelList& faceLabels, const labelListList& faces, const labelList& owner, const labelList& neighbour, const label fluentCellModelID)
    in file create3DCellShape.C at line 280.

FOAM aborting

#0  Foam::error::printStack(Foam::Ostream&) in "/opt/openfoam170/lib/linux64GccDPOpt/libOpenFOAM.so"
#1  Foam::error::abort() in "/opt/openfoam170/lib/linux64GccDPOpt/libOpenFOAM.so"
#2  
 in "/opt/openfoam170/applications/bin/linux64GccDPOpt/fluentMeshToFoam"
#3  
 in "/opt/openfoam170/applications/bin/linux64GccDPOpt/fluentMeshToFoam"
#4  __libc_start_main in "/lib/libc.so.6"
#5  
 in "/opt/openfoam170/applications/bin/linux64GccDPOpt/fluentMeshToFoam"
Aborted
Nico A. is offline   Reply With Quote

Old   June 10, 2011, 04:23
Default
  #4
Super Moderator
 
-mAx-'s Avatar
 
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 2,965
Rep Power: 30
-mAx- will become famous soon enough
Just to check: create another mesh with Gambit (full tetra, or tetra-hexcore)
export, and load it into Foam.
Check if you still have problem.
PS: Something is weird with those 108 polyhedra, since Gambit isn t able to create Polyhedra
__________________
In memory of my friend Hervé: CFD engineer & freerider
-mAx- is offline   Reply With Quote

Old   June 10, 2011, 09:19
Default
  #5
New Member
 
Join Date: Apr 2011
Location: Magdeburg, Germany
Posts: 23
Rep Power: 6
Nico A. is on a distinguished road
Thank you max, for your quick replies. I checked a new mesh, just with a few more cells and it worked. I still dont know why this problems appears but now I can do my simulations on it.
Nico A. is offline   Reply With Quote

Reply

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
[ICEM] Generating Mesh for STL Car in Windtunnel Simulation tommymoose ANSYS Meshing & Geometry 48 April 15, 2013 04:24
Failed 1 Mesh checks !! ? T.D. OpenFOAM Native Meshers: blockMesh 3 February 24, 2011 18:39
Degenerated Contact point - Mesh check failed s.mishra FLUENT 0 March 13, 2010 06:33
fluent add additional zones for the mesh file SSL FLUENT 2 January 26, 2008 12:55
basic of mesh refinement arya CFX 4 June 19, 2007 12:21


All times are GMT -4. The time now is 19:28.