[DanPad07]

Hi all,

I'm trying to implement cyclic boundary conditions in the x and z planes (normal streamline direction to flow) in to my model. Currently I'm having issues for the geometry shown in the image below (failStructure.png) where I get the following error in checkMesh:

Calculating AMI weights between owner patch: cyclic_minX and neighbour patch: cyclic_maxX
AMI: Creating addressing and weights between 11565 source faces and 11609 target faces
AMI: Patch source sum(weights) min:0 max:1.030165 average:0.9380018
AMI: Patch target sum(weights) min:0 max:1.101829 average:0.920908
Calculating AMI weights between owner patch: cyclic_minZ and neighbour patch: cyclic_maxZ
AMI: Creating addressing and weights between 11636 source faces and 11656 target faces
AMI: Patch source sum(weights) min:0 max:1.037275 average:0.9392684
AMI: Patch target sum(weights) min:0 max:1.15886 average:0.9197575

As you can see, the minimum weights for the cyclic patches reaches zero, which causes pimpleFoam to fail later (I think atleast).

Curiously, I managed to get this working for another complex structure (see successStructure.png) so I believe that the issue is related with the meshing or STL file regarding the first structure. There shouldn't be an issue with my STL file since I fixed them with Magics (prior to using surfaceTransformPoints to scale the structure to mm) so the problem should be due to my meshing in snappyhexmesh. Could someone help me with this please?

Interesting point: I found that by increasing the number of cells in the mesh, this would return more problems in checkMesh.

I've also attached a link to my dropbox which includes the base cases for both structures + the log files if anyone would like to have a better look (This is my first time sharing folders via dropbox so let me know if there are any issues).

Link: https://www.dropbox.com/sh/6ynmbsgq4...x3aAgjlfa?dl=0

Thanks in advance!