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[snappyHexMesh] mesh snapping at edge of patches created from .stl files

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Old   June 1, 2020, 09:23
Default mesh snapping at edge of patches created from .stl files
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Alexandra H
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Hello all, I hope you are well!


Backround:
  • I am trying to simulate flow around a static aerofoil cascade (aka turning vanes) to direct flow around a 90deg corner.
  • I am trying to reduce the yPlus value below 1 on the entire surface, while at the same time reducing computational requirements.
  • To achieve this, I have split each aerofoil into 7 patches generated from stl files. The stl files are exported from solidworks and are waterproof (no overlap, no gaps).

Problem:
  • During the snapping stage, the cells that are close to a patch edge snap correctly, but create a very small boundary face (see pictures).
  • During the addLayers stage, this small face is extruding, leading to thin cells and a high Courant Number.
  • Using a minArea limit is not possible, as the smallest problem cell is in refinement level 6 and the largest problem cell is in level 2. As such, their size magnitudes are different and cannot be captured by a minArea limit.
  • The new "mergeAcrossPatches" option does not seem to solve this problem (it also does not seem to work well when I try to add layers).

I have spent a long time trying to fix this, so any suggestions would be more than welcome! Thanks in advance and regards,

Alex
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