验收四路模型并优化拓扑求解性能

tests/test_amesim_pnl0002_pnl0003_component.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import unittest
+from math import log10
 
 from app.simulation.components.amesim.flow.pipes import AmesimPnl0002, AmesimPnl0003
 from app.simulation.core.medium import IdealGasMedium
@@ -45,6 +46,20 @@ class AmesimPnl0002ComponentTests(unittest.TestCase):
         self.assertGreater(forward, 0.0)
         self.assertLess(reverse, 0.0)
 
+    def test_exact_repeated_pipe_flow_inversion_is_cached(self) -> None:
+        pipe = AmesimPnl0002("pnl_2", self.medium, p0=100000.0, T0=293.15)
+        pipe._one_way_pn2pipefr_mass_flow.cache_clear()
+
+        first = pipe.mass_flow(15.3e6, 10.0e6, 293.15)
+        after_first = pipe._one_way_pn2pipefr_mass_flow.cache_info()
+        second = pipe.mass_flow(15.3e6, 10.0e6, 293.15)
+        after_second = pipe._one_way_pn2pipefr_mass_flow.cache_info()
+
+        self.assertEqual(second, first)
+        self.assertEqual(after_first.misses, 1)
+        self.assertEqual(after_second.misses, 1)
+        self.assertEqual(after_second.hits, 1)
+
     def test_external_upstream_flow_uses_connected_stream_temperature(self) -> None:
         pipe = AmesimPnl0002("pnl_2", self.medium, p0=100000.0, T0=350.0)
         center = pipe.properties()
@@ -78,6 +93,23 @@ class AmesimPnl0002ComponentTests(unittest.TestCase):
         self.assertAlmostEqual(flow, expected)
         self.assertNotAlmostEqual(flow, center_temperature_flow)
 
+    def test_fully_rough_limit_matches_nikuradse_colebrook_asymptote(self) -> None:
+        relative_roughness = 0.045 / 20.0
+        pipe = AmesimPnl0002(
+            "pnl_2",
+            self.medium,
+            diam=0.02,
+            le=2.0,
+            rr=relative_roughness,
+        )
+        expected = 1.0 / (-2.0 * log10(relative_roughness / 3.7)) ** 2
+
+        self.assertAlmostEqual(
+            pipe.friction_factor(1.0e12),
+            expected,
+            delta=1.0e-10,
+        )
+
     def test_missing_stream_cache_preserves_center_temperature_fallback(self) -> None:
         pipe = AmesimPnl0002("pnl_2", self.medium, p0=100000.0, T0=350.0)
         center = pipe.properties()