[JacobTheWindWrangler]

Hello All!
This is my first post here, so if I do something wrong, please feel free to correct me. In short:
1. I wondered if it is possible to generate a mesh and boundary layers with cfMesh ([cartesianMesh] command) and then run snappy afterward (just the "snap" step) to improve the mesh, nonOrtho faces etc? This came up because I like the Boundary Layers that cfMesh makes, but it has some nonOrtho cells that are causing me issues, so I want to keep the BL, but use something to fix those cells.

2. Could I use snappy to create the initial mesh, so the castellation and snap steps, and then cfMesh to generate the boundary layers?

Note on option 2: I haven't had much luck with the `generateBoundaryLayers` command by itself in cfMesh. When it makes BL from my meshDict as part of `cartesianMesh` it does well, but if I run it part way and stop it, then say `generateBoundaryLayers` it runs but often gives a lot of warnings. Same if I do `improveMeshQuality` > these are probably different topics though.

General Note: I have tried some version of both methods, and both methods seem to run, but then I don't seem to actually see a difference in Paraview- ie for option 1 I didn't see a change in the mesh, although `checkMesh` is probably where I should look (I think I did, I can't remember), and for option 2 BL weren't added.

Thanks for everyone's help all over the forum! I have read many threads and been helped over the past while haha! I just started openfoam a little over a month ago for an internship.

[JamesJackson]

Initial mesh with snappyHexMesh, followed by cfMesh for boundary layers could be a viable method. If you have problems with the generateBoundaryLayers command, it may be due to your specific configuration or the complexity of your geometry. It is important to review the warnings carefully and adjust your MeshDict settings accordingly.

[rocketLauncher]

I haven't tried this, but in theory it could be possible. However, you should know that boundary layer meshing is one of the weaker points of cfMesh. The features are more developed in the paid version.

Before you try mixing algorithms, I highly recommend running through a little checklist with snappy hex mesh:
1. Do your .stl files capture the geometry well? If not, refine them.
2. Is your blockMesh providing a good enough domain? Snapping is very sensitive to the blockMesh features (nb elements, domain size etc)
3.Run the castellation and snapping steps separately and inspect your mesh before you add layers. No point in trying to build a BL if the rest of the mesh is not up to par.


Good luck!