[tadeuzagallo]

Hello,

I'm meshing a half car model for external aerodynamics simulation, using a relatively fine mesh (~30M cells) and the surface mesh looks decent (apart from some cells snapping to the wrong feature line), but I'm struggling with the shape of the cells near the surface and layers collapsing.

The attached snappyHexMeshDict has the latest configuration I used, where I significantly increased the following parameters, but it made no visible difference:

nSmoothPatch: 3 -> 10
nSolveIter: 30 -> 100
nRelaxIter: 5 -> 20
nFeatureSnapIter: 10 -> 50

I attached the logs for sMH and checkMesh, my snappyHexMeshDict, blockMeshDict and meshQualityDict zipped. I also included screenshots of the problem areas after each step (castellation/snapping/addLayers) as well as the final surface mesh.

I'd really appreciate any suggestions on what I could try next, as I've spent a few months trying to improve this and going through every thread I could find here.

Thanks,
Tadeu