4.6 KiB
Bounded 2D implementation and validation scope
This inventory starts from dev 8403956a9afc0b0bb89265cec374392013d89016 and
integrates only the reviewed LES normalization production correction from
95cb6d2b9f43c1bdd46cbf27f03f0dfc0877cfb0. The merged production bytes match that
tested candidate exactly; the scope-test changes are retained from 53fad767.
GPU receipts remain associated with their exact tested commits, not relabeled as
a new merged-commit run. Historical source identities and gates remain unchanged.
Implementation boundaries
- Uniform D2Q9 supports SRT, TRT and MRT. An available collision selector does not qualify every wall, inlet/outlet, forcing, storage or LES combination.
- Fixed refinement supports SRT/MRT, FP32 and double-buffer streaming; TRT and LES are rejected. Shifted refinement requires all-blocked storage. Refined channel boundaries have narrower configuration guards than uniform boundaries.
- Uniform checkpoints support compatible same-method continuation. Changing collision or LES parameters is a different evolution, not exact continuation. Jet checkpoints and refined checkpoints are unsupported; synchronized remapping is not persistent restart.
- Keep these conclusions 2D. Local D3Q19 operator tests do not establish a supported 3D Simulation runtime.
Evidence and remaining gaps
| Area | Available evidence | Boundary of the conclusion |
|---|---|---|
| MRT cylinder flow and observation windows | Full matched uniform/refined MRT DFG and the window-ledger campaign passed their frozen periodicity, reference and matched-comparison gates. The window campaign used 185a919; its MRT/no-LES numerical path remains unchanged. Current dev also contains independently scoped test/documentation changes and the LES correction, which do not extend MRT qualification. |
This does not qualify other collision/boundary combinations or every refinement interface. Timing improvements are not additional accuracy evidence. |
| Uniform forced channel | Six Poiseuille GPU cases on 8403956: SRT/TRT/MRT at wall-normal resolutions H16/H32 passed. |
This is the tested analytic channel configuration, not open-boundary or all-layout qualification. |
| Uniform restart | Ten SRT/MRT checkpoint GPU tests passed on 8403956; the separate representative TRT same-method double-buffer continuation GPU case also passed (one test). |
This covers the tested same-method continuation configurations. No LES, Jet or refined checkpoint claim follows. |
| Taylor–Green refinement | Independent topology checks are available. The actual-rate phase GPU regression passed one test across two layouts, with errors 1.584e-7 and 4.500e-9. | The physical interface-accuracy gap remains open. Passing topology and phase checks does not establish convergence or close that accuracy gate. |
| Porous Couette and annulus | Prior campaign evidence exists and must remain associated with its original setup and source. | The reconstructed annulus is a validation helper, not qualification of a public boundary-condition API. Do not infer absence of evidence from a missing current rerun. |
| LES normalization | The reviewed correction is integrated. Exact 95cb6d2 GPU validation passed all nine observations and frozen gates, with three warm-up/reset records, verified 101-source/import identity, DONE and exit 0. Last two SGS decrement relative errors were 6.276e-4 and 6.124e-5 against the unchanged 0.15 gate. |
Scope is unforced uniform D2Q9/SRT, shifted FP32, double-buffer streaming and the tested wall-bounded x-periodic shear. No TRT/MRT LES, forcing, EsoPull, objects, refinement or 3D turbulence qualification follows. |
Historical uniform SRT cylinder-startup and inlet-rounding findings remain separate from the passed MRT DFG result. Raw exchange/window consistency is a measurement contract, not a general stress or force-accuracy certification. Existing source-pinned runners may intentionally reject a newer checkout; never silently repin old receipts.
Remaining work
The related host checks passed (67 checks); they do not replace the GPU or physical-accuracy evidence above. Preserve the existing SRT checkpoint cases, historical LES manifests and all frozen numerical criteria.
Continue the TG accuracy investigation using its actual fine-level rates and the established analytic convention. Keep the physical accuracy gate open until the relevant comparison passes. Review this integration independently before publication; no new merged-commit GPU run is claimed here.
No repeat of the accepted full MRT DFG or Cartesian expansion across unsupported combinations is required by this document. Main integration remains a separate review of complete, bounded feature scope.