# Methodology and decision record

1. Inspect the uploaded STL for scale, topology, watertightness, and surface deviations.
2. Repair and feature-preserving remesh the surface, recenter it, and scale it to approximately 0.22 m diameter.
3. Generate an external-flow `snappyHexMesh` domain with ball refinement and nested downstream wake refinement.
4. Reject the original 2.3-million-cell attempt because it created zero prism layers and was unnecessarily expensive.
5. Accept a 263,891-cell layer-free baseline after standard `checkMesh` returned `Mesh OK`.
6. Initialize each flow using steady RANS and advance 0.05 s using URANS k-omega SST.
7. Use bounded upwind velocity convection, Gauss-linear gradients, and orthogonal pressure correction after correction-based schemes triggered OpenFOAM segmentation faults on the polyhedral mesh.
8. Compare final-quarter force statistics and final horizontal centre-plane pressure/velocity fields.

## Reference completed Vicena jobs

- Mesh: `lc4307f06e9613bc745d57aa3aeeeffc64`
- Non-rotating URANS: `lcdf5ea49999027749d01a77bbdf4ea18b`
- Rotating 8 rev/s URANS: `lc26b11458498a7e9c880098996a505773`

The shareable flow bundles improve postprocessing relative to those reference jobs by exporting every saved `U` and `p` time rather than only the final snapshot.
