# Shell Surface Pressure Load 릴리스 준비 보고서

## 1. Metadata

- feature_id: `shell-surface-pressure-load`
- status: `ready-for-release`
- owner_agent: `release-agent`
- date: `2026-09-01`
- audited_head: `e5e8ccc8ff84a97e64ab2bc1889b5ab7aaae1c77`
- physics_evaluated_commit: `1eb4dce885175b78b8229b095f14cac102ea93df`
- workflow_basis: Gates 1–7 Coordinator-audited passed
- authoritative_output: input lexical sibling `<stem>_results.h5`
- tolerance_authority: `docs/TOLERANCE.md`
- source_docs: `requirements.md`, `research.md`, `formulation.md`, `numerical-review.md`, `reference-model.md`, `io.md`, `implementation-plan.md`
- source_reports: `implementation-report.md`, `build-test.md`, `reference-comparison.md`, `corrections.md`, `physics-evaluation.md`

본 판정은 FESA 기능 전달 workflow의 내부 release readiness에 한정한다. Publish, deploy,
package, tag, merge, commit, push 또는 외부 배포 권한을 부여하지 않는다.

## 2. Release Scope

| 구분 | 포함 범위 |
| --- | --- |
| 기능 | Assembly-level `*SURFACE, TYPE=ELEMENT, NAME=<name>`의 `SPOS|SNEG` member에 step-level `*DSLOAD`의 uniform finite scalar `P`를 적용 |
| analysis type | 단일 linear static의 reference-configuration pressure, 단일 `NLGEOM=YES` full-Newton nonlinear static의 current-configuration follower pressure와 external tangent |
| elements | Source type과 label을 보존하는 four-node `S4`, `S4R`; 기존 FESA MITC4 선택 |
| materials/sections | 기존 linear isotropic elastic MITC4 shell material/section; 이 기능은 material 범위를 확장하지 않음 |
| load semantics | Positive `P`는 selected surface normal 반대 방향, negative `P`는 방향 반전, load factor는 정확히 한 번 적용 |
| assembly/physics | Stable full-DOF external load/tangent assembly, free/constrained projection, reaction/free residual, current-arm global force/moment equilibrium, deterministic ordering |
| input subset | Direct `<instance>.<element-label>` member와 explicit `INSTANCE=`에 결속된 flat assembly ELSET member; case-insensitive lookup과 stable raw/source identity |
| result scope | 기존 schema `0`/`1` HDF5의 displacement, generalized force/residual, reaction, global equilibrium 및 기존 MITC4 result chain; 새 pressure-only dataset 없음 |
| reference scope | Exact stored nonlinear S4/SPOS/positive-`P` case의 factor-one nodal `U1/U2/U3` blocking, `UR1/UR2/UR3` warning-only comparison |
| artifact scope | Runtime authoritative artifact는 `<stem>_results.h5`; CSV는 external reference/debug evidence이며 FESA product output이 아님 |

Release 범위에서 제외되는 핵심 항목은 `*DLOAD`, nonuniform/field/user pressure,
node/edge/double-sided/contact surface, S4/S4R 이외 element, material nonlinearity, dynamics,
thermal/contact/buckling, multiple-step propagation, surface offset/thickness-side correction,
pressure-only result quantity 및 다른 solver 내부 알고리즘과의 동등성 주장이다.

## 3. Gate Evidence Inventory

| Gate evidence | feature/status 감사 결과 | release disposition |
| --- | --- | --- |
| `requirements.md` | 동일 feature, must `001`–`024`; 초기 `draft-for-coordinator-gate-review` label을 유지하지만 Coordinator Gate 1 통과 및 이후 전 단계의 binding baseline으로 사용됨 | pass |
| `research.md` | 동일 feature; 초기 gate-review label을 유지하며 formulation/reference 범위와 non-equivalence 경계가 후속 문서에 반영됨 | pass |
| `formulation.md` | `ready-for-numerical-review`; force/tangent/sign/configuration/assembly 계약이 `numerical-review.md`에서 독립 승인됨 | pass |
| `numerical-review.md` | `pass-for-io-definition`; `tau_J=1.0e-12`, analytical/objectivity/tangent/equilibrium gate 확정 | pass |
| `reference-model.md` | `pass-for-io-definition`; exact required input/CSV, row identity, U/UR disposition과 immutable artifact contract 확정 | pass |
| `io.md` | `ready-for-implementation-planning`; input subset, semantic identity, diagnostics, schema `0`/`1`, HDF5-to-CSV projection 확정 | pass |
| `implementation-plan.md` | archival pre-execution label은 `draft-awaiting-user-approval`; 승인 후 materialized Steps 1–7 실행 및 Gate 6 보고서로 plan 이행이 입증됨 | pass |
| `implementation-report.md` | `pass-for-physics-evaluation` 권고; TDD Steps 1–6와 final evidence audit 완료 | pass |
| `build-test.md` | focused `64/64`, pressure reference `9/9`, automatic Stop full MSVC/CTest `362/362`, `0 failed`, 새 `/W4 /WX` warning 없음 | pass |
| `reference-comparison.md` | explicit `pass-for-physics-evaluation`; precheck 통과, U blocking `2187/2187`, UR warning-only `2187/2187`, 두 family row/RMS 모두 pass | pass |
| `corrections.md` | 중복 full-verification Harness timeout을 implementation defect와 분리하고 단일 Stop owner로 교정; 이후 full `362/362`로 해소됨 | resolved/pass |
| `physics-evaluation.md` | `pass-for-release-agent`; force/moment normalized balance `6.758e-14`/`3.725e-14 <= 1e-8`, blocker 없음 | pass |

Staleness 감사에서 Physics Agent가 평가한 `1eb4dce`는 현재 HEAD의 ancestor이며, 그 이후
변경은 `coordination.md`와 `physics-evaluation.md`뿐이다. 평가 후 source, test, CMake,
reference artifact 또는 tolerance 변경은 없다. 초기 문서의 archival status label과
`implementation-report.md`의 compact requirement/evidence shorthand는 Coordinator 승인,
`implementation-plan.md` §11, 실제 named-suite inventory, reference 및 physics evidence로
교차 확인했다. Release acceptance를 바꾸는 미해결 상태·범위·수치 모순은 없다.

### Release Checklist

- [x] 필수 Gate 1–7 문서가 모두 존재하고 `feature_id`가 일치한다.
- [x] Full MSVC x64 Debug build/CTest evidence가 `362/362 PASS`, `0 failed`다.
- [x] `reference-comparison.md`가 `pass-for-physics-evaluation`이고 required comparison file이 모두 존재한다.
- [x] `physics-evaluation.md`가 `pass-for-release-agent`다.
- [x] Must requirement `24/24`가 acceptance, test/internal model, required external reference 및 release disposition에 연결된다.
- [x] Exact input/CSV hash와 path가 구현 전후 동일하다.
- [x] Blocking U family, warning-only UR family 및 internal equilibrium evidence가 모두 pass했다.
- [x] Unsupported/deferred 범위와 accepted limitations를 사용자-facing하게 기록했다.
- [x] Unresolved implementation defect, missing declared comparison file, tolerance 변경 또는 upstream decision이 없다.
- [x] 이 판정이 외부 release 권한이 아님을 명시했다.

## 4. Acceptance Traceability

`test id`는 `implementation-plan.md`의 TDD ID와 실제 passing named suite를 함께 나타낸다.
`BM-*`는 `research.md`의 bounded verification model이며, external case가 필요한 항목에는
`shellnl-meshfine-pressure-s4-follower`를 명시한다.

| requirement id | compact acceptance criterion | test id / passing evidence | reference model id | verification report | release disposition |
| --- | --- | --- | --- | --- | --- |
| `FESA-REQ-SHELL-PRESSURE-001` | Approved SURFACE+DSLOAD S4/S4R mapping과 identity 보존 | `T-INPUT-VALID`; `InpSyntax`, `ShellSurfacePressureInput` | `BM-07` + internal valid fixtures | `build-test.md` | included/pass |
| `FESA-REQ-SHELL-PRESSURE-002` | Positive/zero/negative finite scalar exact-once, nonfinite reject | `T-INPUT-VALID`, `T-INPUT-NEG`; `ShellSurfacePressureDomain` | `BM-01`, `BM-08` | `build-test.md` | included/pass |
| `FESA-REQ-SHELL-PRESSURE-003` | Unique deterministic instance/element/side inventory와 order | `T-INPUT-VALID`, `T-ASSEMBLY`; `SurfacePressureAssembly` | `BM-03` | `build-test.md` | included/pass |
| `FESA-REQ-SHELL-PRESSURE-004` | Only S4/S4R and SPOS/SNEG; source type/label 보존 | `T-INPUT-VALID`, `T-INPUT-NEG`; target rejection cases | `BM-01`, `BM-08` | `build-test.md` | constraint/pass |
| `FESA-REQ-SHELL-PRESSURE-005` | Positive pressure는 selected normal 반대, negative는 정확히 반전 | `T-KERNEL-FORCE`; `ReversesExactlyForSposSnegAndNegativeMagnitude` | `BM-01` | `build-test.md`, `physics-evaluation.md` | physics/pass |
| `FESA-REQ-SHELL-PRESSURE-006` | Connectivity-derived SPOS normal과 SNEG inverse | `T-KERNEL-FORCE`; sign/connectivity kernel cases | `BM-01`, `BM-02` | `build-test.md`, `physics-evaluation.md` | physics/pass |
| `FESA-REQ-SHELL-PRESSURE-007` | Linear pressure는 reference area/normal에서 displacement-independent | `T-KERNEL-FORCE`, `T-LINEAR`; `LinearShellSurfacePressure` | `BM-01`, `BM-02` | `build-test.md` | included/pass |
| `FESA-REQ-SHELL-PRESSURE-008` | NLGEOM pressure는 current `X+u` follower load | `T-KERNEL-FORCE`, `T-NONLINEAR`; current-area/objectivity cases | `BM-04`, `BM-07` | `build-test.md`, `physics-evaluation.md` | physics/pass |
| `FESA-REQ-SHELL-PRESSURE-009` | External follower-force derivative가 Newton tangent에 포함 | `T-KERNEL-TANGENT`, `T-NONLINEAR`; centered FD/sign cases | `BM-05`, `BM-06` | `build-test.md`, `physics-evaluation.md` | numerical/pass |
| `FESA-REQ-SHELL-PRESSURE-010` | Step load factor `0/0.5/1`을 정확히 한 번 적용 | `T-ASSEMBLY`, `T-LINEAR`, `T-NONLINEAR`; factor cases | `BM-03`, `BM-06` | `build-test.md` | numerical/pass |
| `FESA-REQ-SHELL-PRESSURE-011` | Stable full-DOF external load/tangent 후 projection | `T-ASSEMBLY`, `T-LINEAR`; full-space/order cases | `BM-03` | `build-test.md` | included/pass |
| `FESA-REQ-SHELL-PRESSURE-012` | Pressure가 constrained reaction과 free residual에 포함 | `T-LINEAR`, `T-NONLINEAR`; reaction/residual/balance cases | `BM-01`, `BM-06`, `BM-07` | `reference-comparison.md`, `physics-evaluation.md` | physics/pass |
| `FESA-REQ-SHELL-PRESSURE-013` | Resolution/reduction/result/diagnostic/comparison order 결정적 | `T-INPUT-VALID`, `T-ASSEMBLY`, `T-NONLINEAR`, `T-REF-COMPARE` | `BM-03`, `BM-07` | `build-test.md`, `reference-comparison.md` | constraint/pass |
| `FESA-REQ-SHELL-PRESSURE-014` | Unsupported SURFACE/DSLOAD variant fail-closed | `T-INPUT-NEG`; `ShellSurfacePressureInput` negative matrix | `BM-08` | `build-test.md` | constraint/pass |
| `FESA-REQ-SHELL-PRESSURE-015` | Missing/empty/ambiguous/conflicting/scope target fail-closed | `T-INPUT-NEG`; mapping failure/no-partial-candidate cases | `BM-08` | `build-test.md` | constraint/pass |
| `FESA-REQ-SHELL-PRESSURE-016` | Unsupported procedure, nonfinite, invalid geometry fail-closed | `T-INPUT-NEG`, `T-KERNEL-TANGENT`, `T-NONLINEAR`; rollback cases | `BM-04`, `BM-05`, `BM-08` | `build-test.md` | constraint/pass |
| `FESA-REQ-SHELL-PRESSURE-017` | Stable diagnostics와 failed candidate/output atomicity | `T-INPUT-NEG`, `T-CLI-HDF5`, `T-NONLINEAR`; final preservation cases | `BM-08` | `build-test.md` | output/pass |
| `FESA-REQ-SHELL-PRESSURE-018` | 기존 schema `0/1` HDF5만 authoritative; 새 pressure dataset 없음 | `T-CLI-HDF5`; schema/no-new-path writer regressions | `BM-07` | `implementation-report.md`, `build-test.md` | output/pass |
| `FESA-REQ-SHELL-PRESSURE-019` | Existing displacement/reaction/residual/equilibrium/result chain finite | `T-LINEAR`, `T-NONLINEAR`, `T-REF-COMPARE` | `BM-06`, `BM-07` | `reference-comparison.md`, `physics-evaluation.md` | output/pass |
| `FESA-REQ-SHELL-PRESSURE-020` | Linear S4/S4R sign/resultant/reaction/mesh-order suite 통과 | `T-KERNEL-FORCE`, `T-LINEAR`; analytical suites | `BM-01`–`BM-03` | `build-test.md`, `physics-evaluation.md` | verification/pass |
| `FESA-REQ-SHELL-PRESSURE-021` | Objectivity/current-area/tangent/residual/global balance 통과 | `T-KERNEL-TANGENT`, `T-NONLINEAR`; force/moment `<=1e-8` | `BM-04`–`BM-06`, `BM-07` | `reference-comparison.md`, `physics-evaluation.md` | verification/pass |
| `FESA-REQ-SHELL-PRESSURE-022` | Exact required input/CSV를 current path에서 read-only 사용 | `T-REF-PRECHECK`, `E-FINAL`; hash/size pre/post match | `shellnl-meshfine-pressure-s4-follower` | `reference-comparison.md` | verification/pass |
| `FESA-REQ-SHELL-PRESSURE-023` | Factor-one source-key mapping, U blocking/UR warning, precheck first | `T-REF-PRECHECK`, `T-REF-COMPARE`, `E-FINAL`; `2187+2187` | `shellnl-meshfine-pressure-s4-follower` | `reference-comparison.md` | verification/pass |
| `FESA-REQ-SHELL-PRESSURE-024` | Reaction CSV review-only, stress CSV excluded, internal balance 유지 | `T-REF-COMPARE`; no reaction/stress verdict family | `shellnl-meshfine-pressure-s4-follower` | `reference-comparison.md`, `physics-evaluation.md` | constraint/pass |

Trace result: must requirements `24`, release-scoped rows `24`, orphan `0`, deferred must `0`,
missing feature-required comparison files `0`.

## 5. Validation Evidence

| evidence | command / source | result |
| --- | --- | --- |
| Configure | `cmake --fresh -S . -B .harness/build -G "Visual Studio 18 2026" -A x64 ...` | exit `0`; MSVC 19.51.36252.0 |
| Focused build | `cmake --build .harness/build --config Debug --target fesa_unit_tests fesa_integration_tests fesa_reference_tests` | exit `0`; new warning `0` |
| Discovery | `ctest --test-dir .harness/build -C Debug --show-only=json-v1` | `362` discovered, feature suites nonzero |
| Focused CTest | `ctest --test-dir .harness/build -C Debug --output-on-failure -R "^(InpSyntax|ShellSurfacePressureInput|ShellSurfacePressureDomain|ShellSurfacePressureKernel|SurfacePressureAssembly|LinearShellSurfacePressure|NonlinearShellSurfacePressure|ShellSurfacePressureApplication|ShellSurfacePressureReference)\."` | `64/64 PASS` |
| FESA reference execution | `fesa.exe .harness/build/reference/shell-surface-pressure-load/shellNL-meshfine-pressure.inp` | exit `0`; factor-one increment accepted; schema-1 HDF5 atomic publish |
| Pressure comparison | `ctest --test-dir .harness/build -C Debug --output-on-failure -R "^ShellSurfacePressureReference\."` | `9/9 PASS` before and after generated HDF5 |
| Automatic Stop build | `cmake --build .harness/build --config Debug` | PASS |
| Automatic Stop full CTest | `ctest --test-dir .harness/build -C Debug --output-on-failure` | `362/362 PASS`, `0 failed` |
| Harness Python pytest | N/A | Harness/Python behavior 및 file 변경이 없어 upstream plan/report에서 적용 대상이 아님 |

Reference artifact pre/post evidence:

- Required input: SHA-256 `53718ccc9b41c23fcc1b509a51d66f1347e87aca43a74f1d6cec4d2085f4b90e`, `56,665` bytes, unchanged.
- Required displacement CSV: SHA-256 `2fe53f98eac9f04779100721c3edf8049eb1dbfe733ebcbd819aeeed03b81198`, `111,182` bytes, unchanged.
- `pressure_nodal_translation_blocking`: `2187/2187` rows pass, relative RMS `5.18831997081359e-5 <= 0.01`.
- `pressure_nodal_rotation_warning`: `2187/2187` rows pass, relative RMS `3.10406152731217e-4 <= 0.01`; warning `0`.
- Accepted free translation residual: `6.12848863188238e-11 <= 1e-2`.
- Accepted free rotation residual: zero-external-scale branch `1.3758908607997e-6 <= 1e-3`.
- Physics re-evaluation: normalized force balance `6.758e-14`, moment balance `3.725e-14`, each `<=1e-8`.

## 6. Known Limitations

1. 입력은 assembly-level `TYPE=ELEMENT` surface와 uniform `DSLOAD P`의 승인 subset뿐이다.
   `*DLOAD`, `P n`, `PNU`, `HP`, `VP`, `SP`, `TRVEC`, `TRSHR`, nonuniform/user pressure,
   `AMPLITUDE`, `FOLLOWER`, `OP`, `REF NODE`, `*INCLUDE`와 승인되지 않은 parameter는 지원하지 않는다.
2. Surface는 single-sided `SPOS|SNEG` four-node `S4`/`S4R`만 지원한다. Node/edge/double-sided,
   analytical/contact surface, part-level surface, implicit/mixed-instance ELSET, transformed instance,
   S3/S8/solid/continuum-shell/membrane/beam/rigid element는 범위 밖이다.
3. 단일 linear static 또는 단일 approved `NLGEOM=YES` full-Newton static step만 지원한다.
   Dynamics, thermal, contact, buckling perturbation, cavity/pipe pressure와 multiple-step propagation은 제외된다.
4. 기존 linear isotropic elastic MITC4 material/section만 사용한다. Material nonlinearity,
   composite/hyperelastic/plastic section, surface offset, thickness-face arm/correction 및 pressure
   distributed couple은 지원하지 않는다.
5. Pressure는 midsurface translational generalized force를 만든다. Rotational pressure entries는
   exact zero이며 physical global moment는 force arm으로 평가한다. Invalid/collapsed/folded current
   surface는 `tau_J=1.0e-12` gate에서 fail-closed한다.
6. Authoritative output은 기존 `<stem>_results.h5`뿐이며 surface/load 또는 pressure-only dataset은
   추가되지 않는다. CSV는 product output이 아니다.
7. Stored external case는 `S4`, `SPOS`, positive `P=1e6`, `NLGEOM=YES` nonlinear displacement만
   직접 검증한다. `S4R`, `SNEG`, negative/zero pressure, linear path, objectivity와 tangent는
   passing blocking internal tests로 보완되며 별도 external reference case는 없다.
8. `UR1/UR2/UR3` external comparison은 contract상 `warning-only`다. 이번 evidence에서는 모두
   통과했지만 향후 warning-only mismatch는 blocking U verdict를 바꾸지 않는다.
9. Reaction CSV는 `review-only`, stress CSV는 `excluded`다. Local reaction distribution이나
   stress agreement을 external acceptance로 주장하지 않으며 internal residual/equilibrium gate를 사용한다.
10. 직접 적용 가능한 public S4/S4R follower-pressure benchmark가 없다는 연구 한계가 있다.
    Analytical/kernel/solution tests와 exact stored case로 보완했으며 실험 validation을 주장하지 않는다.
11. FESA는 독립 solver다. Abaqus를 포함한 다른 solver의 내부 formulation, quadrature,
    stabilization, tangent 또는 result-generation equivalence를 주장하지 않는다.

Deferred must requirement, unresolved defect, accepted blocking risk 또는 release-blocking open item은 없다.

## 7. Release Notes Draft

### 사용자-facing 요약

FESA는 이제 승인된 Abaqus `.inp` subset에서 assembly named element surface의 `S4`/`S4R`
`SPOS` 또는 `SNEG` 면에 uniform `*DSLOAD P`를 적용할 수 있다. Linear static에서는 reference
surface를, `NLGEOM=YES` nonlinear static에서는 current surface follower force와 consistent
external tangent를 사용한다. Pressure는 기존 full-space load, reaction/free residual,
global equilibrium 및 HDF5 result lifecycle에 통합된다.

### 검증 범위

- MSVC x64 Debug full CTest `362/362 PASS`, focused feature tests `64/64 PASS`.
- Exact stored nonlinear case에서 factor-one U blocking `2187/2187`, UR warning-only
  `2187/2187` rows pass.
- Factor-one normalized global force/moment balance는 각각 `6.758e-14`, `3.725e-14`로
  승인 gate `1e-8`을 통과했다.
- S4R, side/sign reversal, linear reference pressure, current-area objectivity, external tangent와
  invalid geometry는 독립 internal analytical/FD/fail-closed tests로 검증했다.

### 주요 제한 및 사용 주의

이 release는 single-step linear 또는 approved nonlinear static, four-node S4/S4R, existing
linear-isotropic MITC4 section과 uniform single-sided pressure만 지원한다. `*DLOAD`, nonuniform
pressure, amplitude, node/edge/contact/double-sided surface, 다른 element/procedure/material 및
surface offset/thickness correction은 지원하지 않는다. Model-consistent unit system을 사용해야
하며 invalid current surface geometry는 fail-closed한다. UR은 warning-only이고 reaction/stress
CSV는 external verdict 대상이 아니다. Abaqus 내부 동등성이나 실험 validation은 주장하지 않는다.

### Artifact paths

- Runtime authoritative output: input lexical sibling `<stem>_results.h5`
- Required reference input: `reference/shellNL-meshfine-pressure/shellNL-meshfine-pressure.inp`
- Required comparison CSV: `reference/shellNL-meshfine-pressure/shellNL-meshfine-pressure displacements.csv`
- Release record: `docs/shell-surface-pressure-load/release.md`

## 8. Release Verdict

**Verdict: `ready-for-release`.**

필수 upstream gate, full build/test, blocking reference comparison과 physics evaluation이 모두
통과했다. Must requirement `24/24`가 release scope, acceptance criterion, implementation/test
또는 applicable reference evidence와 최종 disposition에 연결되고, known limitations가
release notes에 포함되었다. Missing/failed/stale required evidence, unresolved defect,
missing comparison file, tolerance conflict 또는 physics blocker는 없다.

이 verdict는 FESA 내부 feature delivery closure recommendation이며 외부 release 행위를
승인하지 않는다.

## 9. Handoff Recommendation

Coordinator Agent는 Gate 8을 `passed`로 기록하고 `shell-surface-pressure-load` workflow를
내부적으로 closure하는 것을 권고한다. 추가 Correction, Implementation, Physics Evaluation
또는 upstream decision return은 필요하지 않다. Publish, deploy, package, tag, merge, commit,
push 또는 external release는 별도 명시적 권한 없이는 수행하지 않는다.

## 10. No-Change Assertion

Release Agent는 이 감사에서 `docs/shell-surface-pressure-load/release.md`만 생성했다. Source,
public/private header, test, CMake, build/Harness configuration, phase files, upstream feature
documents/reports, `coordination.md`, reference input/CSV, generated HDF5/log,
`docs/TOLERANCE.md` 및 tolerance policy는 수정하지 않았다. Abaqus, Nastran 또는 다른
reference solver를 실행하지 않았고 build, CTest, Harness 또는 FESA CLI를 재실행하지 않았다.

## 11. Open Issues

- Missing evidence: 없음.
- Contradictory upstream verdict/status/value: 없음. Archival pre-gate metadata와 compact
  trace shorthand는 Coordinator 승인 및 actual passing evidence로 교차 확인되었다.
- Unresolved defects or failed corrections: 없음. Harness duplicate-verification timeout correction은
  이후 automatic Stop full `362/362 PASS`로 해소되었다.
- Missing declared comparison files or mappings: 없음.
- Release documentation gap: 없음.
- Blockers: 없음.