# Reference Model 문서 작성 가이드

이 디렉터리는 Reference Model Agent가 작성하거나 제안한 기능별 reference model 설계 문서를 보관하는 위치다.

Reference Model Agent는 FESA 기능 검증에 필요한 Abaqus `.inp` 기반 테스트 모델 포트폴리오와 `reference/<model-id>/` artifact bundle 계약을 정의한다. Agent는 Abaqus, Nastran 또는 레퍼런스 솔버를 직접 실행하지 않고, Abaqus reference CSV 파일을 생성하거나 수정하지 않으며, solver 결과 비교나 release readiness 승인도 하지 않는다.

기본 파일명은 `docs/reference-models/<feature-id>-reference-models.md` 형식을 사용한다. 각 문서는 요구조건, 연구 브리프, 정식화, 수치 리뷰, I/O 정의를 입력으로 받아 구현 전에 준비해야 할 테스트 모델과 reference artifact 요구사항을 정의해야 한다.

## Reference Model Agent 역할

수행한다:
- 기능별 reference model portfolio를 smoke, analytical, patch test, benchmark, regression, negative/invalid-input model로 구분한다.
- `model.inp`가 I/O Definition Agent의 supported Abaqus keyword subset 안에 있는지 확인한다.
- `reference/<model-id>/` artifact bundle 구조와 필수 파일을 정의한다.
- `metadata.json` provenance, 단위, 좌표계, Abaqus version/source, output request, tolerance 정책을 정의한다.
- Abaqus reference CSV 파일 요구사항을 정의한다.
- requirement와 model, compared quantity, FESA HDF5 dataset, reference CSV, tolerance, artifact status를 연결하는 Coverage Matrix를 작성한다.

수행하지 않는다:
- C++ 코드를 구현하지 않는다.
- parser를 구현하지 않는다.
- C++ API나 파일 구조를 설계하지 않는다.
- Abaqus, Nastran 또는 레퍼런스 솔버를 직접 실행하지 않는다.
- Abaqus reference CSV 파일을 생성하거나 수정하지 않는다.
- solver 결과를 비교하지 않는다.
- release readiness를 승인하지 않는다.
- reference 값, tolerance, Abaqus compatibility를 임의로 만들지 않는다.

## 문서 템플릿

```markdown
# <feature title> Reference Models

## Metadata
- feature_id: <feature-id>
- source_requirement: docs/requirements/<feature-id>.md
- source_research: docs/research/<feature-id>-research.md
- source_formulation: docs/formulations/<feature-id>-formulation.md
- source_numerical_review: docs/numerical-reviews/<feature-id>-review.md
- source_io_definition: docs/io-definitions/<feature-id>-io.md
- status: draft | needs-user-decision | needs-reference-artifacts | ready-for-implementation-planning | blocked
- owner_agent: reference-model-agent
- date: <YYYY-MM-DD>

## Reference Strategy
- verification_scope: <feature verification purpose>
- code_verification: <unit/math-level checks supported by this portfolio>
- solution_verification: <mesh, convergence, patch, or analytical checks>
- benchmark_reference_comparison: <Abaqus/NAFEMS/NASA/paper-derived comparison plan>
- excluded_validation_scope: <physical experiment validation excluded unless explicitly available>

## Model Inventory

| model_id | category | purpose | status | required_artifacts |
| --- | --- | --- | --- | --- |
| <model-id> | smoke | <basic parser/solve path> | draft | model.inp, metadata.json, required Abaqus reference CSV files |
| <model-id> | analytical | <closed-form comparison> | draft | model.inp, metadata.json, required Abaqus reference CSV files |
| <model-id> | patch test | <element consistency check> | draft | model.inp, metadata.json, required Abaqus reference CSV files |
| <model-id> | benchmark | <trusted benchmark comparison> | draft | model.inp, metadata.json, required Abaqus reference CSV files |
| <model-id> | regression | <known defect guard> | draft | model.inp, metadata.json, required Abaqus reference CSV files |
| <model-id> | negative/invalid-input | <unsupported keyword or invalid model diagnostic> | draft | model.inp, metadata.json |

## Model Record

### <model-id>
- category: smoke | analytical | patch test | benchmark | regression | negative/invalid-input
- purpose: <what this model proves>
- verified_requirements: [<requirement-id>]
- analysis_type: <linear static | nonlinear static | modal | other>
- element_type: <Abaqus element type and FESA feature element>
- material: <material model and values>
- boundary_conditions: <BC summary>
- loads: <load summary>
- expected_physical_quantities: displacement | reaction | internal force | stress | strain | energy | residual
- tolerance: <absolute/relative/norm policy or needs-user-decision>
- source: <user | analytical | Abaqus Verification Guide | Abaqus Benchmarks Guide | NAFEMS | NASA/FEMCI | paper>
- artifact_status: draft | needs-reference-artifacts | ready-for-implementation-planning | blocked

## Abaqus Input Requirements
- input_file: reference/<model-id>/model.inp
- supported_keyword_subset: <keywords from docs/io-definitions/<feature-id>-io.md>
- model_data: <nodes, elements, sets, material, section, coordinates, units>
- history_data: <step, procedure, boundary conditions, loads, output requests>
- output_requests: <requests needed to populate Abaqus reference CSV files>
- unsupported_keyword_policy: unsupported | ignored-with-warning | requires-user-decision

## Artifact Bundle Contract

```text
reference/
  <model-id>/
    model.inp
    metadata.json
    <model-id>_displacements.csv
    <model-id>_reactions.csv
    <model-id>_internalforces.csv
    <model-id>_stresses.csv
    README.md
```

Required files:
- `model.inp`: Abaqus input file for the reference model.
- `metadata.json`: provenance and model contract metadata.
- `<model-id>_displacements.csv`: required when nodal displacement is a verification quantity.
- `<model-id>_reactions.csv`: required when constrained DOF reactions or global equilibrium are verification quantities.
- `<model-id>_internalforces.csv`: required when element internal force is a verification quantity.
- `<model-id>_stresses.csv`: required when stress is a verification quantity.
- `README.md`: short description, generation notes, and limitations.

Optional files:
- `<model-id>_strains.csv`: required when strain is part of the acceptance criteria.
- `<model-id>_energy_or_residual.csv`: required when energy balance, residual, or convergence data is part of the acceptance criteria.
- `<model-id>_<quantity>.csv`: feature-specific reference quantity when upstream contracts require it.
- `notes.md`: manual review notes.

## Metadata JSON Contract

```json
{
  "feature_id": "<feature-id>",
  "model_id": "<model-id>",
  "artifact_status": "draft | needs-reference-artifacts | ready-for-implementation-planning | blocked",
  "input_file": "model.inp",
  "abaqus_version": "<version or needs-user-decision>",
  "generation_owner": "<person/procedure>",
  "generation_date": "<YYYY-MM-DD>",
  "source_documents": ["docs/requirements/<feature-id>.md"],
  "units": "<unit system>",
  "coordinate_system": "global Cartesian unless otherwise documented",
  "analysis_type": "<analysis type>",
  "element_types": ["<Abaqus element type>"],
  "material_values": {},
  "boundary_condition_summary": "<summary>",
  "load_summary": "<summary>",
  "output_requests": ["U", "RF", "S", "<feature-specific quantities>"],
  "reference_csv_schema_version": "<version>",
  "reference_csv_files": [
    "<model-id>_displacements.csv",
    "<model-id>_reactions.csv",
    "<model-id>_internalforces.csv",
    "<model-id>_stresses.csv"
  ],
  "tolerance_policy": "<absolute/relative/norm policy>",
  "limitations": ["<known limitation>"]
}
```

## Abaqus Reference CSV Requirements

### `<model-id>_displacements.csv`
- Required when nodal displacement is a verification quantity.
- Must include step/frame identity, node id, displacement components, coordinate system, and units.

### `<model-id>_reactions.csv`
- Required when constrained DOF reactions or global equilibrium are verification quantities.
- Must include step/frame identity, node id, reaction components, coordinate system, and units.

### `<model-id>_internalforces.csv`
- Required when element internal force is a verification quantity.
- Must include step/frame identity, element id, output location, component, value, and units.

### `<model-id>_stresses.csv`
- Required when stress is a verification quantity.
- Must include step/frame identity, element id, integration point or recovery location, component, value, coordinate system, and units.

### Optional Reference CSV Files
- `<model-id>_strains.csv`: required when strain is part of the acceptance criteria.
- `<model-id>_energy_or_residual.csv`: required when energy balance, residual, or convergence data is part of the acceptance criteria.
- `<model-id>_<quantity>.csv`: required when a feature-specific quantity is part of the acceptance criteria.

## Coverage Matrix

| requirement_id | model_id | compared_quantity | fesa_hdf5_dataset | reference_csv | tolerance | verification_method | status |
| --- | --- | --- | --- | --- | --- | --- | --- |
| <req-id> | <model-id> | displacement | /steps/<step>/frames/<frame>/field_outputs/U | reference/<model-id>/<model-id>_displacements.csv | <policy> | hdf5-to-reference-csv | draft |
| <req-id> | <model-id> | reaction | /steps/<step>/frames/<frame>/field_outputs/RF | reference/<model-id>/<model-id>_reactions.csv | <policy> | hdf5-to-reference-csv | draft |
| <req-id> | <model-id> | internal force | /steps/<step>/frames/<frame>/field_outputs/element_forces | reference/<model-id>/<model-id>_internalforces.csv | <policy> | hdf5-to-reference-csv | draft |
| <req-id> | <model-id> | stress | /steps/<step>/frames/<frame>/field_outputs/S | reference/<model-id>/<model-id>_stresses.csv | <policy> | hdf5-to-reference-csv | draft |

## Artifact Acceptance Checklist
- 모든 `must` requirement가 최소 하나의 `model_id`와 `compared_quantity`에 연결되어 있다.
- `model.inp`가 기능별 supported Abaqus keyword subset을 벗어나지 않는다.
- `metadata.json`에 provenance, Abaqus version/source, units, coordinate system, tolerance, reference CSV schema version이 기록되어 있다.
- 필요한 Abaqus reference CSV 파일이 존재하거나, 기능상 불필요한 quantity는 명확한 reason과 함께 제외되어 있다.
- output request가 필요한 Abaqus reference CSV 물리량을 생성할 수 있도록 정의되어 있다.
- required Abaqus reference CSV 또는 metadata provenance가 없으면 status는 `needs-reference-artifacts`다.
- tolerance, source, units, coordinate system이 불명확하면 status는 `needs-user-decision`이다.

## Open Issues and Downstream Handoff

### I/O Definition Agent
- <supported keyword, output request, FESA HDF5 schema clarification, reference CSV row schema clarification>

### Implementation Planning Agent
- <tests that should fail before implementation, model order, acceptance criteria>

### Reference Verification Agent
- <FESA HDF5 dataset paths, reference CSV schema, ID matching, units, coordinate conventions, output locations, tolerance mapping>

### Physics Evaluation Agent
- <equilibrium, symmetry, displacement direction, stress location, rigid body mode, load path sanity checks>
```

## 품질 기준

- Reference model의 목적과 검증 대상 requirement가 명확해야 한다.
- `model.inp`는 Abaqus input file이며, 기능별 supported keyword subset을 따라야 한다.
- model data와 history data를 구분해야 한다.
- output request와 required Abaqus reference CSV 사이의 연결이 명확해야 한다.
- `reference/<model-id>/` 구조와 필수 artifact가 명시되어야 한다.
- `metadata.json`에는 provenance, Abaqus version/source, units, coordinate system, tolerance, reference CSV schema version이 포함되어야 한다.
- required Abaqus reference CSV가 없으면 완료 상태가 아니라 `needs-reference-artifacts` 상태로 둔다.
- 모든 `must` requirement는 Coverage Matrix에서 model, compared quantity, FESA HDF5 dataset, reference CSV, tolerance, verification method로 추적되어야 한다.