export mesh to openfoam

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export mesh to openfoam

Postby delphine » Sat Feb 01, 2014 11:10 pm

Dear all,

I export my geometry and mesh in Fluent format.
Then, I'm using function fluent3DMeshToFoam in openfoam.
But when I check the mesh with checkMesh function, I have error messages.
Do you know what is the problem ?


Create time

Create polyMesh for time = 0

Time = 0

Mesh stats
points: 491492
internal points: 0
faces: 978495
internal faces: 486975
cells: 244250
faces per cell: 5.99988
boundary patches: 6
point zones: 0
face zones: 1
cell zones: 11

Overall number of cells of each type:
hexahedra: 244220
prisms: 0
wedges: 0
pyramids: 0
tet wedges: 0
tetrahedra: 0
polyhedra: 30
Breakdown of polyhedra by number of faces:
faces number of cells
5 30

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
ParoiChaude 604 1210 ok (non-closed singly connected)
ParoiAdiabatic 1946 3900 multiply connected (shared edge)
Outlet 200 402 ok (non-closed singly connected)
Inlet1 200 402 ok (non-closed singly connected)
Inlet2 70 142 ok (non-closed singly connected)
FrontAndBack 488500 491492 ok (non-closed singly connected)
<<Writing 2 conflicting points to set nonManifoldPoints

Checking geometry...
Overall domain bounding box (-0.6 -6 -0.5) (0.4 6 0.5)
Mesh (non-empty, non-wedge) directions (1 1 1)
Mesh (non-empty) directions (1 1 1)
***Boundary openness (-3.25254e-15 -0.00110302 -2.98803e-14) possible hole in boundary description.
***Open cells found, max cell openness: 1, number of open cells 30
<<Writing 30 non closed cells to set nonClosedCells
<<Writing 5057 cells with high aspect ratio to set highAspectRatioCells
Minimum face area = 1.10917e-06. Maximum face area = 0.0100012. Face area magnitudes OK.
Min volume = 1.10917e-06. Max volume = 5e-05. Total volume = 9.6399. Cell volumes OK.
Mesh non-orthogonality Max: 86.8953 average: 24.837
*Number of severely non-orthogonal (> 70 degrees) faces: 36211.
Non-orthogonality check OK.
<<Writing 36211 non-orthogonal faces to set nonOrthoFaces
Face pyramids OK.
Max skewness = 0.798997 OK.
Coupled point location match (average 0) OK.

Failed 2 mesh checks.

End

thanks a lot for your response
delphine
 
Posts: 5
Joined: Sat Jan 25, 2014 6:35 am

Re: export mesh to openfoam

Postby corey_ernst » Thu Feb 06, 2014 9:48 am

Can you supply me with the commands that generated and exported the mesh in Trelis? There are some diagnostic tool in Trelis that we can try to see if the mesh is bad before exporting it.

--Corey
corey_ernst
 
Posts: 12
Joined: Tue Jan 07, 2014 4:27 pm

Re: export mesh to openfoam

Postby delphine » Sat Feb 08, 2014 4:14 am

The command was :
Trelis> export Fluent "/Users/delphine/Desktop/maille2smoothFrontBack.msh" overwrite


Executive Fluent summary:
Number of dimensions = 3
Number of element blocks = 11
Number of sidesets = 6
Number of nodesets = 0
Number of bc sets = 1
Number of elements = 244250
Number of nodes = 491492

Finished writing /Users/Delphine/Desktop/maille2smoothFrontBack.msh
Journaled Command: export fluent "/Users/Delphine/Desktop/maille2smoothFrontBack.msh" overwrite

I managed to correct my mistakes by checking the boundary conditions. But, I always have this message :
***High aspect ratio cells found, Max aspect ratio: 3075.21, number of cells 3533

delphine
delphine
 
Posts: 5
Joined: Sat Jan 25, 2014 6:35 am


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