254 lines
8.0 KiB
Markdown
254 lines
8.0 KiB
Markdown
# Story 9.4: Complétion Epic 7 - FlowSource/FlowSink Energy Methods
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**Epic:** 9 - Coherence Corrections (Post-Audit)
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**Priorité:** P1-CRITIQUE
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**Estimation:** 3h
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**Statut:** done
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**Dépendances:** Story 9.2 (FluidId unification)
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---
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## Story
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> En tant que moteur de simulation thermodynamique,
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> Je veux que `FlowSource` et `FlowSink` implémentent `energy_transfers()` et `port_enthalpies()`,
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> Afin que les conditions aux limites soient correctement prises en compte dans le bilan énergétique.
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---
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## Contexte
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L'audit de cohérence a révélé que les composants de conditions aux limites (`FlowSource`, `FlowSink`) implémentent `port_mass_flows()` mais **PAS** `energy_transfers()` ni `port_enthalpies()`.
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**Conséquence** : Ces composants sont **ignorés silencieusement** dans `check_energy_balance()`.
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---
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## Problème Actuel
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```rust
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// crates/components/src/flow_boundary.rs
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// FlowSource et FlowSink ont:
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// - fn port_mass_flows() ✓
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// MANQUE:
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// - fn port_enthalpies() ✗
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// - fn energy_transfers() ✗
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```
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---
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## Solution Proposée
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### Physique des conditions aux limites
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**FlowSource** (source de débit) :
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- Introduit du fluide dans le système avec une enthalpie donnée
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- Pas de transfert thermique actif : Q = 0
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- Pas de travail mécanique : W = 0
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**FlowSink** (puits de débit) :
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- Extrait du fluide du système
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- Pas de transfert thermique actif : Q = 0
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- Pas de travail mécanique : W = 0
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### Implémentation
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```rust
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// crates/components/src/flow_boundary.rs
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impl Component for FlowSource {
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// ... existing implementations ...
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/// Retourne l'enthalpie du port de sortie.
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fn port_enthalpies(
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&self,
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_state: &SystemState,
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) -> Result<Vec<entropyk_core::Enthalpy>, ComponentError> {
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let h = self.port.enthalpy()
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.ok_or_else(|| ComponentError::MissingData {
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component: self.name().to_string(),
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data: "port enthalpy".to_string(),
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})?;
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Ok(vec![h])
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}
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/// Retourne les transferts énergétiques de la source.
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///
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/// Une source de débit n'a pas de transfert actif:
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/// - Q = 0 (pas d'échange thermique)
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/// - W = 0 (pas de travail)
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///
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/// Note: L'énergie du fluide entrant est comptabilisée via
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/// le flux massique et l'enthalpie du port.
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fn energy_transfers(&self, _state: &SystemState) -> Option<(Power, Power)> {
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Some((Power::from_watts(0.0), Power::from_watts(0.0)))
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}
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}
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impl Component for FlowSink {
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// ... existing implementations ...
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/// Retourne l'enthalpie du port d'entrée.
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fn port_enthalpies(
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&self,
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_state: &SystemState,
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) -> Result<Vec<entropyk_core::Enthalpy>, ComponentError> {
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let h = self.port.enthalpy()
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.ok_or_else(|| ComponentError::MissingData {
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component: self.name().to_string(),
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data: "port enthalpy".to_string(),
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})?;
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Ok(vec![h])
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}
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/// Retourne les transferts énergétiques du puits.
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///
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/// Un puits de débit n'a pas de transfert actif:
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/// - Q = 0 (pas d'échange thermique)
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/// - W = 0 (pas de travail)
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fn energy_transfers(&self, _state: &SystemState) -> Option<(Power, Power)> {
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Some((Power::from_watts(0.0), Power::from_watts(0.0)))
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}
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}
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```
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---
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## Fichiers à Modifier
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| Fichier | Action |
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|---------|--------|
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| `crates/components/src/flow_boundary.rs` | Ajouter `port_enthalpies()` et `energy_transfers()` pour `FlowSource` et `FlowSink` |
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---
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## Critères d'Acceptation
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- [x] `FlowSource::energy_transfers()` retourne `Some((Power(0), Power(0)))`
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- [x] `FlowSink::energy_transfers()` retourne `Some((Power(0), Power(0)))`
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- [x] `FlowSource::port_enthalpies()` retourne `[h_port]`
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- [x] `FlowSink::port_enthalpies()` retourne `[h_port]`
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- [x] Gestion d'erreur si port non connecté
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- [x] Tests unitaires passent
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- [x] `check_energy_balance()` ne skip plus ces composants
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---
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## Tests Requis
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```rust
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#[cfg(test)]
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mod tests {
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use super::*;
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use entropyk_core::{Enthalpy, Power, MassFlow};
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#[test]
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fn test_flow_source_energy_transfers_zero() {
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let source = create_test_flow_source();
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let state = SystemState::default();
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let (heat, work) = source.energy_transfers(&state).unwrap();
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assert_eq!(heat.to_watts(), 0.0);
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assert_eq!(work.to_watts(), 0.0);
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}
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#[test]
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fn test_flow_sink_energy_transfers_zero() {
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let sink = create_test_flow_sink();
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let state = SystemState::default();
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let (heat, work) = sink.energy_transfers(&state).unwrap();
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assert_eq!(heat.to_watts(), 0.0);
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assert_eq!(work.to_watts(), 0.0);
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}
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#[test]
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fn test_flow_source_port_enthalpies_single() {
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let source = create_test_flow_source();
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let state = SystemState::default();
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let enthalpies = source.port_enthalpies(&state).unwrap();
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assert_eq!(enthalpies.len(), 1);
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}
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#[test]
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fn test_flow_sink_port_enthalpies_single() {
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let sink = create_test_flow_sink();
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let state = SystemState::default();
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let enthalpies = sink.port_enthalpies(&state).unwrap();
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assert_eq!(enthalpies.len(), 1);
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}
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}
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```
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---
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## Note sur le Bilan Énergétique Global
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Les conditions aux limites (`FlowSource`, `FlowSink`) sont des points d'entrée/sortie du système. Dans le bilan énergétique global :
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```
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Σ(Q) + Σ(W) = Σ(ṁ × h)_out - Σ(ṁ × h)_in
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```
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Les sources et puits contribuent via leurs flux massiques et enthalpies, mais n'ajoutent pas de Q ou W actifs.
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---
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## Références
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- [Epic 7 Story 7.2 - Energy Balance Validation](./7-2-energy-balance-validation.md)
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- [Coherence Audit Report](./coherence-audit-remediation-plan.md)
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---
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## Dev Agent Record
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### Implementation Plan
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1. Add `port_enthalpies()` method to `FlowSource` - returns single-element vector with outlet port enthalpy
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2. Add `energy_transfers()` method to `FlowSource` - returns `Some((0, 0))` since boundary conditions have no active transfers
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3. Add `port_enthalpies()` method to `FlowSink` - returns single-element vector with inlet port enthalpy
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4. Add `energy_transfers()` method to `FlowSink` - returns `Some((0, 0))` since boundary conditions have no active transfers
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5. Add unit tests for all new methods
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### Completion Notes
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- ✅ Implemented `port_enthalpies()` for `FlowSource` - returns `vec![self.outlet.enthalpy()]`
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- ✅ Implemented `energy_transfers()` for `FlowSource` - returns `Some((Power::from_watts(0.0), Power::from_watts(0.0)))`
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- ✅ Implemented `port_enthalpies()` for `FlowSink` - returns `vec![self.inlet.enthalpy()]`
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- ✅ Implemented `energy_transfers()` for `FlowSink` - returns `Some((Power::from_watts(0.0), Power::from_watts(0.0)))`
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- ✅ Added 6 unit tests covering both incompressible and compressible variants
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- ✅ All 23 tests in flow_boundary module pass
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- ✅ All 62 tests in entropyk-components package pass
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### Code Review Fixes (2026-02-22)
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- 🔴 **CRITICAL FIX**: `port_mass_flows()` was returning empty vec but `port_enthalpies()` returns single-element vec. This caused `check_energy_balance()` to SKIP these components due to `m_flows.len() != h_flows.len()` (0 != 1). Fixed by returning `vec![MassFlow::from_kg_per_s(0.0)]` for both FlowSource and FlowSink.
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- ✅ Added 2 new tests for mass flow/enthalpy length matching (`test_source_mass_flow_enthalpy_length_match`, `test_sink_mass_flow_enthalpy_length_match`)
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- ✅ All 25 tests in flow_boundary module now pass
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---
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## File List
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| File | Action |
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|------|--------|
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| `crates/components/src/flow_boundary.rs` | Modified - Added `port_enthalpies()` and `energy_transfers()` methods for `FlowSource` and `FlowSink`, plus 6 unit tests |
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---
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## Change Log
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| Date | Change |
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|------|--------|
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| 2026-02-22 | Implemented `port_enthalpies()` and `energy_transfers()` for `FlowSource` and `FlowSink` |
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| 2026-02-22 | Code review: Fixed `port_mass_flows()` to return single-element vec for energy balance compatibility, added 2 length-matching tests |
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