|August 19, 2013, 02:07||
Problems during import of fluent mesh
Join Date: Jun 2012
Posts: 10Rep Power: 5
I'm new in the world of OpenFoam. I simulate with Ansys CFX and Fluent before. I calculate turbomachinerys.
Now, I want to import a mesh from fluent to OpenFoam. All worked fine. But when I checked the Mesh the following error-message turn up:
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create polyMesh for time = 0
Time = 0
internal points: 1694027
internal faces: 16148136
faces per cell: 4.19533
boundary patches: 13
point zones: 0
face zones: 3
cell zones: 3
Overall number of cells of each type:
tet wedges: 0
****Problem with boundary patch 0 named inlet of type patch. The patch should start on face no 16148136 and the patch specifies 16608933.
Possibly consecutive patches have this same problem. Suppressing future warnings.
***Boundary definition is in error.
Cell to face addressing OK.
Point usage OK.
Upper triangular ordering OK.
Face vertices OK.
*Number of regions: 3
The mesh has multiple regions which are not connected by any face.
<<Writing region information to "0/cellToRegion"
Checking patch topology for multiply connected surfaces...
Patch Faces Points Surface topology
inlet 230 206 ok (non-closed singly connected)
outlet 58 41 ok (non-closed singly connected)
wall-zusammenbau.ipt-laufrad253364 127485 ok (non-closed singly connected)
wall-zusammenbau.ipt-zustroemung51769 25927 ok (non-closed singly connected)
wall-zusammenbau.ipt-spiralgehaeuse16666 9629 ok (non-closed singly connected)
wall_stat_rot-zusammenbau.ipt-spiralgehaeuse15883 8239 ok (non-closed singly connected)
wall_stat_rot-zusammenbau.ipt-zustroemung54260 27289 ok (non-closed singly connected)
iface_inlet_rotor_r 5801 3734 ok (non-closed singly connected)
iface_outlet_rotor_r26251 16303 ok (non-closed singly connected)
iface_inlet_rotor_zu4478 3017 ok (non-closed singly connected)
iface_spirale_zustroemung_zu802 743 ok (non-closed singly connected)
iface_spirale_zustroemung_sp7718 4212 ok (non-closed singly connected)
iface_outlet_rotor_sp23805 12538 ok (non-closed singly connected)
Overall domain bounding box (-0.046 -0.841397 -0.99) (2.019 2.63 0.722329)
Mesh (non-empty, non-wedge) directions (1 1 1)
Mesh (non-empty) directions (1 1 1)
Boundary openness (8.78283e-16 1.25826e-16 7.37172e-18) OK.
Max cell openness = 6.40899e-16 OK.
Max aspect ratio = 22.1214 OK.
Minimum face area = 2.47887e-09. Maximum face area = 0.00689013. Face area magnitudes OK.
Min volume = 7.05732e-13. Max volume = 0.00015816. Total volume = 1.32234. Cell volumes OK.
Mesh non-orthogonality Max: 79.1261 average: 17.6258
*Number of severely non-orthogonal faces: 195.
Non-orthogonality check OK.
<<Writing 195 non-orthogonal faces to set nonOrthoFaces
Face pyramids OK.
***Max skewness = 5.42954, 24 highly skew faces detected which may impair the quality of the results
<<Writing 24 skew faces to set skewFaces
Coupled point location match (average 0) OK.
Failed 1 mesh checks.
What could be a reason? When I run my case with k-epsilon it doesn't work. After 5 timesteps the timestep continuty error is verhy high. But when I try without turbulence model it would be better....
Thanks in advance.
|August 19, 2013, 05:11||
Join Date: Jun 2012
Posts: 10Rep Power: 5
Is it possible, that the problem is because of using different mesh-regions? I use 3 regions. Maybe it doens't worked with multiple regions. So I try to import the regions seperate and then I merge them together?
|October 4, 2013, 12:44||
Join Date: Oct 2012
Posts: 77Rep Power: 6
Nevertheless, in OpenFOAM, when you have multiple regions, you have to use the utility splitMeshRegion to split the mesh into subMeshes and have a 0, constant and system directory for each of the region. Check out chtMultiRegionFoam in the heatTransfer directory for ideas regarding how to set up multi-region simulations in OpenFOAM.
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