[vitokad]

Hello Foamers,

i'm working on the common problem of rotor-stator. My rotor is "immerged" in an environment. I've 2 different meshes, rotor and environment. I used the command fluentMeshToFoam to use them in openfoam.

Than i rescale the rotor with the command transformPoints, and now rotor and environment have the same height.

After that, i use the command mergeMeshes to merge rotor and environment.

I create a dictionary topoSetDict to create a cylinder region (rotating region), named rotor.

When i use checkMesh the check failed with this error:

Mesh stats
points: 112010
internal points: 4
faces: 361044
internal faces: 156380
cells: 101680
faces per cell: 5.08875
boundary patches: 9
point zones: 0
face zones: 0
cell zones: 1

Overall number of cells of each type:
hexahedra: 9024
prisms: 92656
wedges: 0
pyramids: 0
tet wedges: 0
tetrahedra: 0
polyhedra: 0

Checking topology...
Boundary definition OK.
Cell to face addressing OK.
***Unused points found in the mesh, number unused by faces: 4 number unused by cells: 4
<<Writing 4 unused points to set unusedPoints
Upper triangular ordering OK.
Face vertices OK.
*Number of regions: 2
The mesh has multiple regions which are not connected by any face.
<<Writing region information to "0/cellToRegion"
<<Writing region 0 with 37802 cells to cellSet region0
<<Writing region 1 with 63878 cells to cellSet region1

Checking patch topology for multiply connected surfaces...
Patch Faces Points Surface topology
AIRFOIL_DX 376 752 ok (non-closed singly connected)
AIRFOIL_SX 376 752 ok (non-closed singly connected)
frontAndBackPlanes 203360 112006 ok (non-closed singly connected)
AMI1 200 400 ok (non-closed singly connected)
INLET 38 78 ok (non-closed singly connected)
OUTLET 38 78 ok (non-closed singly connected)
WALL_DX 38 78 ok (non-closed singly connected)
WALL_SX 38 78 ok (non-closed singly connected)
AMI2 200 400 ok (non-closed singly connected)

Checking geometry...
Overall domain bounding box (-60 -40 -1.69706) (60 80 1.69706)
Mesh (non-empty, non-wedge) directions (1 1 0)
Mesh (non-empty) directions (1 1 0)
All edges aligned with or perpendicular to non-empty directions.
Boundary openness (6.94185e-18 -4.84503e-18 2.93105e-24) OK.
Max cell openness = 3.26067e-15 OK.
Max aspect ratio = 86.65 OK.
Minimum face area = 3.17962e-08. Maximum face area = 15.9533. Face area magnitudes OK.
Min volume = 1.0792e-07. Max volume = 26.1164. Total volume = 48875.1. Cell volumes OK.
Mesh non-orthogonality Max: 47.1422 average: 2.35539
Non-orthogonality check OK.
Face pyramids OK.
Max skewness = 2.40473 OK.
Coupled point location match (average 0) OK.

Failed 1 mesh checks.

End


I don't know which is the error, because on fluent it works.
I hope someone can help me!

This is my polymesh directory: https://www.dropbox.com/s/4odldp1xfc...sh.tar.gz?dl=0

Best regards


Vito

[adarsh tiwari]

Hi,

I am a new user of OpenFOAM but I think it is all about multiple fluid meshes, or multiple regions.

• Multiple material meshes are not permitted. If multiple fluid materials exist, they will be converted into a single OpenFOAM mesh; if a solid region is detected, the converter will attempt to filter it out.
• Fluent allows the user to define a patch which is internal to the mesh, i.e. consists of the faces with cells on both sides. Such patches are not allowed in OpenFOAM and the converter will attempt to filter them out.
• There is currently no support for embedded interfaces and refinement trees.

Please read the contents in the following link point 5.5.1 in detail: http://www.openfoam.org/docs/user/me...27-1610005.5.1

Hope this helps !!

Thanks and Regards,
Adarsh Tiwari

[vitokad]

Thanks for the reply adarsh tiwari,

but it's strange, because the calculation is in progress now..I hope someone has experience in this type of situation!

[s1291]

I believe this issue is encountered when you have some duplicate nodes. In your meshing software, look for an option to merge nodes. and re-export your mesh. This should solve this issue.