CFD Online Discussion Forums - [snappyHexMesh] weird results with featureEdges

Hi,
I am using snappyHexMesh and surfaceFeatureEdges extract to mesh a complex pipe with several intets/outlets. My goal is to have first, a good mesh and second, nice surface that can be detected with autoPatch to set up BCs.

Unfortunately, the mesh is quite ugly near the featureEdges as you can see on the pictures. I tried to play with the refinement parameters with no success.

Any idea on how to improve this ?

By the way, is there a way to use these featureEdges to locate BCs instead of using autoPatch ?

Attachment 23959 Attachment 23961
Attachment 23960

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Modifying de skewness parameters made everything work actually ; however, I'm still stuck with my BCs detection method. Even if I try to optimize the angle, the autoPatch still gives me unwanted results like this :

Code:

Feature:55

minCos :0.5735764



Assigned 1 faces to patch auto0



Assigned 892 faces to patch auto1



Assigned 1 faces to patch auto2



Assigned 1 faces to patch auto3



Assigned 69995 faces to patch auto4



Assigned 22 faces to patch auto5



Assigned 300 faces to patch auto6



End

Is there an alternative way to define the BCs location ?

Regards,

Florian