优化仿真求解性能并修复流量闭合问题（初版）

tests/test_amesim_pnl00r_component.py

@@ -59,6 +59,39 @@ class AmesimPnl00rComponentTests(unittest.TestCase):
         self.assertLess(reverse, 0.0)
         self.assertAlmostEqual(forward, -reverse, delta=abs(forward) * 0.02)
 
+    def test_mass_flow_is_continuous_across_former_relative_deadband(self) -> None:
+        pipe = AmesimPnl00r("pnl_1", self.medium, diam=0.014, le=1.0, rr=0.045 / 14.0)
+        base_pressure = 8.0e6
+        former_threshold = base_pressure * 1.0e-7
+
+        below = pipe.mass_flow(base_pressure + 0.99 * former_threshold, base_pressure)
+        above = pipe.mass_flow(base_pressure + 1.01 * former_threshold, base_pressure)
+        reverse = pipe.mass_flow(base_pressure, base_pressure + 0.99 * former_threshold)
+
+        self.assertGreater(below, 0.0)
+        self.assertGreater(above, below)
+        self.assertLess(reverse, 0.0)
+        self.assertAlmostEqual(below, -reverse, delta=abs(below) * 1.0e-9)
+        self.assertLess(abs(above - below), abs(above) * 0.05)
+        self.assertEqual(pipe.mass_flow(base_pressure, base_pressure), 0.0)
+        self.assertGreater(pipe.mass_flow(15.3e6 + 0.1, 15.3e6), 0.0)
+
+    def test_mass_flow_is_continuous_across_former_relative_deadband(self) -> None:
+        pipe = AmesimPnl00r("pnl_1", self.medium, diam=0.014, le=1.0, rr=0.045 / 14.0)
+        base_pressure = 8.0e6
+        former_threshold = base_pressure * 1.0e-7
+
+        below = pipe.mass_flow(base_pressure + 0.99 * former_threshold, base_pressure)
+        above = pipe.mass_flow(base_pressure + 1.01 * former_threshold, base_pressure)
+        reverse = pipe.mass_flow(base_pressure, base_pressure + 0.99 * former_threshold)
+
+        self.assertGreater(below, 0.0)
+        self.assertGreater(above, below)
+        self.assertLess(reverse, 0.0)
+        self.assertAlmostEqual(below, -reverse, delta=abs(below) * 1.0e-9)
+        self.assertLess(abs(above - below), abs(above) * 0.05)
+        self.assertEqual(pipe.mass_flow(base_pressure, base_pressure), 0.0)
+
     def test_friction_factor_transitions_from_laminar_to_turbulent(self) -> None:
         pipe = AmesimPnl00r("pnl_1", self.medium, rr=1e-5)