Agent skill
solver-benchmark-orcawave-via-orcfxapi
Sub-skill of solver-benchmark: OrcaWave (via OrcFxAPI) (+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/solver-benchmark/orcawave-via-orcfxapi
SKILL.md
OrcaWave (via OrcFxAPI) (+3)
OrcaWave (via OrcFxAPI)
Critical data extraction gotchas:
| Property | Convention | Action Required |
|---|---|---|
.frequencies |
Returns Hz (NOT rad/s) | Multiply by 2 * pi |
.frequencies |
Returns descending order | Sort ascending with np.argsort() |
.displacementRAOs |
Shape (nheading, nfreq, 6) |
Transpose to (nfreq, nheading, 6) |
.displacementRAOs |
Rotational DOFs in rad/m | Convert to deg/m with np.degrees() for AQWA comparison |
.addedMass / .damping |
Same descending frequency order | Apply same sort index |
See sub-skills for full details.
AQWA Standalone (Non-Workbench)
DAT file generation requirements:
| Setting | Requirement | Consequence if Wrong |
|---|---|---|
| Element type | QPPL DIFF (not QPPL) |
Zero RAOs — "NON-DIFFRACTING" elements |
| ILID card | ILID AUTO <group> after ZLWL |
"REGLID: NO DIFFRACTING ELEMENTS FOUND" |
| SEAG card | 2 parameters only: SEAG (nx, ny) |
"FAILED TO READ SEA GRID PARAMETERS" |
| Line length | Max 80 columns | Delimiter read errors |
| Mesh quality | Panels ~square, facet radius check | FATAL error at 90° corners (non-overridable) |
| OPTIONS GOON | Continues past non-fatal errors | Does NOT override FATAL mesh quality |
| Heading range | -180 to +180 for no-symmetry bodies | Missing heading coverage |
AQWA LIS File Parsing
| Pattern | Gotcha | Fix |
|---|---|---|
ADDED MASS |
Double space between words | Use whitespace normalization |
| Damping frequency | WAVE FREQUENCY line is ~23 lines before DAMPING header | Search backward 30 lines |
| Matrix rows | Separated by blank lines | Skip blank lines in row parsing |
| RAO section | First occurrence = displacement RAOs | Skip subsequent velocity/acceleration sections |
| Heading expansion | 5 input headings may produce 9 output (-180 to +180) | Filter to requested headings |
BEMRosetta / Nemoh
| Aspect | Status | Notes |
|---|---|---|
| BEMRosetta CLI | Mesh conversion only (-mesh mode) |
Not a solver itself |
| Nemoh solver | Open source (GPL) | https://gitlab.com/lheea/Nemoh |
| Nemoh docs | Workshop tutorials | https://lheea.gitlab.io/Nemoh-Workshop/running-Nemoh.html |
| Integration | Future work | Nemoh backend adapter not yet implemented |
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