[SNAPPY] Enable only selected shapes of UniformRefinement

[piotrkluba]

Note

Medium Risk
Introduces stricter validation rules for snappy workflows and changes when/where validation runs (especially for volume refinements projected to surface), which may break previously-accepted configs but is otherwise localized to meshing parameter validation/translation.

Overview
snappyHexMesh UniformRefinement validation is tightened and made consistent across surface/volume workflows. UniformRefinement now rejects unsupported entity types under snappy (only Box, Cylinder, Sphere are allowed), and additional constraints are enforced: boxes must be axis-aligned and cylinders must be non-hollow.

The snappy-specific entity checks were refactored into a shared helper (meshing_validators.py) and are now applied not only in snappy.SurfaceMeshingParams, but also in VolumeMeshingParams whenever a UniformRefinement is projected to the surface mesh (project_to_surface default/True; skipped when explicitly False). Tests and translator golden output were extended to cover these cases, including new sphere-based snappy coupled-refinement translation coverage.

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Cursor Bugbot has reviewed your changes and found 1 potential issue.

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Cylinder with None inner_radius causes AttributeError in validator

Medium Severity

Cylinder.inner_radius is Optional[LengthType.NonNegative] (with default 0 * u.m), so it can be explicitly None. The expression entity.inner_radius.to("m") on line 23 will raise an AttributeError when inner_radius is None, instead of correctly treating it as a full cylinder (equivalent to inner_radius=0). This is now reachable through the newly added _check_snappy_uniform_refinement_entities validator in VolumeMeshingParams, expanding the blast radius of this crash path.

Additional Locations (1)

• flow360/component/simulation/meshing_param/params.py#L564-L576