优化仿真求解性能并修复流量闭合问题（初版）

tests/test_amesim_pnl0002_pnl0003_component.py

@@ -241,6 +241,85 @@ class AmesimPnl0003ComponentTests(unittest.TestCase):
         self.assertGreater(forward, 0.0)
         self.assertLess(reverse, 0.0)
 
+    def test_center_flow_is_continuous_across_former_relative_deadband(self) -> None:
+        base_pressure = 8.0e6
+        former_threshold = base_pressure * 1.0e-7
+
+        below = AmesimPnl0003(
+            "below",
+            self.medium,
+            p1_0=base_pressure + 0.99 * former_threshold,
+            p2_0=base_pressure,
+        ).resistance_mass_flow()
+        above = AmesimPnl0003(
+            "above",
+            self.medium,
+            p1_0=base_pressure + 1.01 * former_threshold,
+            p2_0=base_pressure,
+        ).resistance_mass_flow()
+        reverse = AmesimPnl0003(
+            "reverse",
+            self.medium,
+            p1_0=base_pressure,
+            p2_0=base_pressure + 0.99 * former_threshold,
+        ).resistance_mass_flow()
+        equal = AmesimPnl0003(
+            "equal",
+            self.medium,
+            p1_0=base_pressure,
+            p2_0=base_pressure,
+        ).resistance_mass_flow()
+        small = AmesimPnl0003(
+            "small",
+            self.medium,
+            p1_0=15.3e6 + 0.1,
+            p2_0=15.3e6,
+        ).resistance_mass_flow()
+
+        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(equal, 0.0)
+        self.assertGreater(small, 0.0)
+
+    def test_center_flow_is_continuous_across_former_relative_deadband(self) -> None:
+        base_pressure = 8.0e6
+        former_threshold = base_pressure * 1.0e-7
+
+        below = AmesimPnl0003(
+            "below",
+            self.medium,
+            p1_0=base_pressure + 0.99 * former_threshold,
+            p2_0=base_pressure,
+        ).resistance_mass_flow()
+        above = AmesimPnl0003(
+            "above",
+            self.medium,
+            p1_0=base_pressure + 1.01 * former_threshold,
+            p2_0=base_pressure,
+        ).resistance_mass_flow()
+        reverse = AmesimPnl0003(
+            "reverse",
+            self.medium,
+            p1_0=base_pressure,
+            p2_0=base_pressure + 0.99 * former_threshold,
+        ).resistance_mass_flow()
+        equal = AmesimPnl0003(
+            "equal",
+            self.medium,
+            p1_0=base_pressure,
+            p2_0=base_pressure,
+        ).resistance_mass_flow()
+
+        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(equal, 0.0)
+
     def test_pressure_flow_residuals_bind_both_port_pressures_to_states(self) -> None:
         pipe = AmesimPnl0003("pnl_3", self.medium)
         pipe.properties_1()