Agent skill
diffraction-analysis-unit-conversion-traps
Sub-skill of diffraction-analysis: Unit Conversion Traps (+3).
Install this agent skill to your Project
npx add-skill https://github.com/vamseeachanta/workspace-hub/tree/main/.claude/skills/_archive/engineering/marine-offshore/diffraction-analysis/unit-conversion-traps
SKILL.md
Unit Conversion Traps (+3)
Unit Conversion Traps
| Source | Mass Unit | Inertia Unit | Density | Convert to spec.yml |
|---|---|---|---|---|
WAMIT .frc |
te | te·m² | 1 (te/m³) | ×1000 for kg, kg·m² |
| OrcaWave | te | te·m² | 1 (te/m³) | ×1000 for kg, kg·m² |
| AQWA | kg | kg·m² | 1025 (kg/m³) | Direct |
| spec.yml | kg | kg·m² | kg/m³ | — |
Trap: When porting from WAMIT .frc to spec.yml, multiply inertia by 1000 (te·m² → kg·m²). Do NOT multiply twice — the ISSC TLP case 2.5 had a 1000x error from double conversion.
Phase Correlation for Zero-Magnitude DOFs
Fixed DOFs (e.g. heave/roll/pitch on TLPs) produce zero RAO magnitudes. Phase is undefined (atan2(0,0) noise), so:
multi_solver_comparator.py: overrides phase correlation to 1.0 whenpeak_mag < 1e-10validate_owd_vs_spec.py: skips DOFs withmax_diff < 1e-6in pass/fail verdict
Benchmark Report Geometry Schematics
The build_mesh_schematic_html() in benchmark_plotter.py renders interactive 3D Plotly mesh visualizations. It requires mesh_path in solver_metadata. When using build_orcawave_metadata_from_yml(), propagate mesh_path from build_solver_metadata() base metadata — the enriched YAML metadata doesn't resolve mesh paths.
Mesh Quality Assessment
- Adjacent panel ratio (between neighbors) is the key metric — not global min/max area ratio
- Gradual size variation is acceptable even with large global ratio
- Report uses
NOTE:prefix (informational) notWARNING:for area ratio - Advanced metrics (Jacobian, aspect ratio, skewness) available via gmsh meshing tool
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