PythonModels/systems/test_mql.py

@@ -4703,6 +4703,25 @@ class TestMqlSystem:
         p4_port1_next_primary_chamber = self.network.components[
             p4_port1_next_primary_chamber_alias
         ]
+        p4_port1_next_port1 = self._pnl0002_connection_for_node_port(
+            p4_port1_next_node_alias,
+            "port_1",
+        )
+        p4_port1_next_port1_line = self.pnl0002_assembly.lines[
+            p4_port1_next_port1.line_alias
+        ]
+        p4_bridge_node_alias = p4_port1_next_port1.remote_node_alias
+        p4_bridge_node = self.node4_assembly[p4_bridge_node_alias]
+        p4_bridge_primary = self._p4_primary_connection_for_node(
+            p4_bridge_node_alias
+        )
+        p4_bridge_primary_line = self.pnl0001_assembly.lines[
+            p4_bridge_primary.line_alias
+        ]
+        p4_bridge_primary_chamber_alias = p4_bridge_primary.chamber_alias
+        p4_bridge_primary_chamber = self.network.components[
+            p4_bridge_primary_chamber_alias
+        ]
         p4_port1_remote_orifice = self.pneumatic_assembly.variable_orifices[
             p4_port1_remote_neighborhood.port_4.orifice_alias
         ]
@@ -4761,6 +4780,18 @@ class TestMqlSystem:
         p4_port3_next_primary_chamber = self.network.components[
             p4_port3_next_primary_chamber_alias
         ]
+        p4_port3_next_port3 = self._pnl0002_connection_for_node_port(
+            p4_port3_next_node_alias,
+            "port_3",
+        )
+        if p4_port3_next_port3.remote_node_alias != p4_bridge_node_alias:
+            raise ValueError(
+                f"{p4_port3_next_port3.line_alias} does not connect back to "
+                f"{p4_bridge_node_alias}"
+            )
+        p4_port3_next_port3_line = self.pnl0002_assembly.lines[
+            p4_port3_next_port3.line_alias
+        ]
         p4_port3_remote_orifice = self.pneumatic_assembly.variable_orifices[
             p4_port3_remote_neighborhood.port_4.orifice_alias
         ]
@@ -4827,6 +4858,10 @@ class TestMqlSystem:
             raise TypeError(
                 f"{p4_port3_next_primary_chamber_alias} is not an AMESim pneumatic volume"
             )
+        if not isinstance(p4_bridge_primary_chamber, AmesimPneumaticVolume):
+            raise TypeError(
+                f"{p4_bridge_primary_chamber_alias} is not an AMESim pneumatic volume"
+            )
         if not isinstance(inlet_orifice, AmesimPneumaticOrifice):
             raise TypeError(
                 f"{spec.inlet_orifice_alias} is not an AMESim pneumatic orifice"
@@ -4862,6 +4897,10 @@ class TestMqlSystem:
                 p4_port1_next_node=p4_port1_next_node,
                 p4_port1_next_primary_line=p4_port1_next_primary_line,
                 p4_port1_next_primary_chamber=p4_port1_next_primary_chamber,
+                p4_port1_next_port1_line=p4_port1_next_port1_line,
+                p4_bridge_node=p4_bridge_node,
+                p4_bridge_primary_line=p4_bridge_primary_line,
+                p4_bridge_primary_chamber=p4_bridge_primary_chamber,
                 p4_port1_remote_orifice=p4_port1_remote_orifice,
                 p4_port1_remote_orifice_line=p4_port1_remote_orifice_line,
                 p4_port1_remote_orifice_node=p4_port1_remote_orifice_node,
@@ -4877,6 +4916,7 @@ class TestMqlSystem:
                 p4_port3_next_node=p4_port3_next_node,
                 p4_port3_next_primary_line=p4_port3_next_primary_line,
                 p4_port3_next_primary_chamber=p4_port3_next_primary_chamber,
+                p4_port3_next_port3_line=p4_port3_next_port3_line,
                 p4_port3_remote_orifice=p4_port3_remote_orifice,
                 p4_port3_remote_orifice_line=p4_port3_remote_orifice_line,
                 p4_port3_remote_orifice_node=p4_port3_remote_orifice_node,

PythonModels/systems/test_mql_closure.py

@@ -211,6 +211,10 @@ class TestMqlPn3P4NodeChamberSegmentComponents:
     p4_port1_next_node: TestMqlPneumaticNode4
     p4_port1_next_primary_line: AmesimPnl0001Pipe
     p4_port1_next_primary_chamber: AmesimPneumaticVolume
+    p4_port1_next_port1_line: AmesimPnl0002Pipe
+    p4_bridge_node: TestMqlPneumaticNode4
+    p4_bridge_primary_line: AmesimPnl0001Pipe
+    p4_bridge_primary_chamber: AmesimPneumaticVolume
     p4_port1_remote_orifice: AmesimPneumaticOrifice
     p4_port1_remote_orifice_line: AmesimPnl0003Pipe
     p4_port1_remote_orifice_node: TestMqlPneumaticNode3
@@ -226,6 +230,7 @@ class TestMqlPn3P4NodeChamberSegmentComponents:
     p4_port3_next_node: TestMqlPneumaticNode4
     p4_port3_next_primary_line: AmesimPnl0001Pipe
     p4_port3_next_primary_chamber: AmesimPneumaticVolume
+    p4_port3_next_port3_line: AmesimPnl0002Pipe
     p4_port3_remote_orifice: AmesimPneumaticOrifice
     p4_port3_remote_orifice_line: AmesimPnl0003Pipe
     p4_port3_remote_orifice_node: TestMqlPneumaticNode3
@@ -258,6 +263,9 @@ class TestMqlPn3P4NodeChamberSegmentSnapshot:
     p4_port1_far_port1_line: ThermodynamicProperties
     p4_port1_next_primary_line: ThermodynamicProperties
     p4_port1_next_primary_chamber: ThermodynamicProperties
+    p4_port1_next_port1_line: ThermodynamicProperties
+    p4_bridge_primary_line: ThermodynamicProperties
+    p4_bridge_primary_chamber: ThermodynamicProperties
     p4_port1_remote_orifice_line_port_1: ThermodynamicProperties
     p4_port1_remote_orifice_line_port_2: ThermodynamicProperties
     p4_port3_line: ThermodynamicProperties
@@ -269,6 +277,7 @@ class TestMqlPn3P4NodeChamberSegmentSnapshot:
     p4_port3_far_port3_line: ThermodynamicProperties
     p4_port3_next_primary_line: ThermodynamicProperties
     p4_port3_next_primary_chamber: ThermodynamicProperties
+    p4_port3_next_port3_line: ThermodynamicProperties
     p4_port3_remote_orifice_line_port_1: ThermodynamicProperties
     p4_port3_remote_orifice_line_port_2: ThermodynamicProperties
     p4_port3_remote_resistance_node_line_port_1: ThermodynamicProperties
@@ -280,6 +289,7 @@ class TestMqlPn3P4NodeChamberSegmentSnapshot:
     p4_port1_remote_balance: TestMqlPneumaticNode4Balance
     p4_port1_far_balance: TestMqlPneumaticNode4Balance
     p4_port1_next_balance: TestMqlPneumaticNode4Balance
+    p4_bridge_balance: TestMqlPneumaticNode4Balance
     p4_port1_remote_orifice_node_balance: TestMqlPneumaticNode3Balance
     p4_port3_remote_balance: TestMqlPneumaticNode4Balance
     p4_port3_far_balance: TestMqlPneumaticNode4Balance
@@ -308,6 +318,10 @@ class TestMqlPn3P4NodeChamberSegmentSnapshot:
     p4_port1_next_node_to_line_flow: float
     p4_port1_next_chamber_to_line_flow: float
     p4_port1_next_node_to_primary_line_flow: float
+    p4_port1_next_to_bridge_line_flow: float
+    p4_bridge_to_port1_next_line_flow: float
+    p4_bridge_chamber_to_line_flow: float
+    p4_bridge_node_to_primary_line_flow: float
     p4_port1_remote_node_to_orifice_line_flow: float
     p4_port1_remote_orifice_line_center_flow: float
     p4_port1_remote_orifice_to_node_flow: float
@@ -323,6 +337,8 @@ class TestMqlPn3P4NodeChamberSegmentSnapshot:
     p4_port3_next_node_to_line_flow: float
     p4_port3_next_chamber_to_line_flow: float
     p4_port3_next_node_to_primary_line_flow: float
+    p4_bridge_to_port3_next_line_flow: float
+    p4_port3_next_to_bridge_line_flow: float
     p4_port3_remote_node_to_orifice_line_flow: float
     p4_port3_remote_node_to_resistance_flow: float
     p4_port3_remote_resistance_node_to_line_flow: float
@@ -368,6 +384,9 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             *self.components.p4_port1_far_port1_line.get_state_vector(),
             *self.components.p4_port1_next_primary_line.get_state_vector(),
             *self.components.p4_port1_next_primary_chamber.get_state_vector(),
+            *self.components.p4_port1_next_port1_line.get_state_vector(),
+            *self.components.p4_bridge_primary_line.get_state_vector(),
+            *self.components.p4_bridge_primary_chamber.get_state_vector(),
             *self.components.p4_port1_remote_orifice_line.get_state_vector(),
             *self.components.p4_port3_line.get_state_vector(),
             *self.components.p4_port3_remote_primary_line.get_state_vector(),
@@ -378,13 +397,14 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             *self.components.p4_port3_far_port3_line.get_state_vector(),
             *self.components.p4_port3_next_primary_line.get_state_vector(),
             *self.components.p4_port3_next_primary_chamber.get_state_vector(),
+            *self.components.p4_port3_next_port3_line.get_state_vector(),
             *self.components.p4_port3_remote_resistance_node_line.get_state_vector(),
             *self.components.p4_port3_remote_orifice_line.get_state_vector(),
         ]
 
     def apply_state_vector(self, values: list[float]) -> None:
-        if len(values) != 62:
+        if len(values) != 70:
-            raise ValueError("PN3/P4 node chamber segment state vector requires sixty-two values")
+            raise ValueError("PN3/P4 node chamber segment state vector requires seventy values")
         self.components.inlet_line.set_state_vector(values[:2])
         self.components.volume.set_state_vector(values[2:4])
         self.components.outlet_line.set_state_vector(values[4:6])
@@ -400,18 +420,22 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
         self.components.p4_port1_far_port1_line.set_state_vector(values[26:28])
         self.components.p4_port1_next_primary_line.set_state_vector(values[28:30])
         self.components.p4_port1_next_primary_chamber.set_state_vector(values[30:32])
-        self.components.p4_port1_remote_orifice_line.set_state_vector(values[32:36])
+        self.components.p4_port1_next_port1_line.set_state_vector(values[32:34])
-        self.components.p4_port3_line.set_state_vector(values[36:38])
+        self.components.p4_bridge_primary_line.set_state_vector(values[34:36])
-        self.components.p4_port3_remote_primary_line.set_state_vector(values[38:40])
+        self.components.p4_bridge_primary_chamber.set_state_vector(values[36:38])
-        self.components.p4_port3_remote_primary_chamber.set_state_vector(values[40:42])
+        self.components.p4_port1_remote_orifice_line.set_state_vector(values[38:42])
-        self.components.p4_port3_remote_port3_line.set_state_vector(values[42:44])
+        self.components.p4_port3_line.set_state_vector(values[42:44])
-        self.components.p4_port3_far_primary_line.set_state_vector(values[44:46])
+        self.components.p4_port3_remote_primary_line.set_state_vector(values[44:46])
-        self.components.p4_port3_far_primary_chamber.set_state_vector(values[46:48])
+        self.components.p4_port3_remote_primary_chamber.set_state_vector(values[46:48])
-        self.components.p4_port3_far_port3_line.set_state_vector(values[48:50])
+        self.components.p4_port3_remote_port3_line.set_state_vector(values[48:50])
-        self.components.p4_port3_next_primary_line.set_state_vector(values[50:52])
+        self.components.p4_port3_far_primary_line.set_state_vector(values[50:52])
-        self.components.p4_port3_next_primary_chamber.set_state_vector(values[52:54])
+        self.components.p4_port3_far_primary_chamber.set_state_vector(values[52:54])
-        self.components.p4_port3_remote_resistance_node_line.set_state_vector(values[54:58])
+        self.components.p4_port3_far_port3_line.set_state_vector(values[54:56])
-        self.components.p4_port3_remote_orifice_line.set_state_vector(values[58:])
+        self.components.p4_port3_next_primary_line.set_state_vector(values[56:58])
+        self.components.p4_port3_next_primary_chamber.set_state_vector(values[58:60])
+        self.components.p4_port3_next_port3_line.set_state_vector(values[60:62])
+        self.components.p4_port3_remote_resistance_node_line.set_state_vector(values[62:66])
+        self.components.p4_port3_remote_orifice_line.set_state_vector(values[66:])
 
     def snapshot(
         self,
@@ -445,6 +469,9 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
         p4_port1_next_primary_chamber = (
             self.components.p4_port1_next_primary_chamber.properties()
         )
+        p4_port1_next_port1_line = self.components.p4_port1_next_port1_line.properties()
+        p4_bridge_primary_line = self.components.p4_bridge_primary_line.properties()
+        p4_bridge_primary_chamber = self.components.p4_bridge_primary_chamber.properties()
         p4_port1_remote_orifice_line_port_1 = (
             self.components.p4_port1_remote_orifice_line.properties_1()
         )
@@ -470,6 +497,7 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
         p4_port3_next_primary_chamber = (
             self.components.p4_port3_next_primary_chamber.properties()
         )
+        p4_port3_next_port3_line = self.components.p4_port3_next_port3_line.properties()
         p4_port3_remote_orifice_line_port_1 = (
             self.components.p4_port3_remote_orifice_line.properties_1()
         )
@@ -592,6 +620,24 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
                 port_1_temperature_k=p4_port1_next_primary_chamber.T,
             )
         )
+        p4_port1_next_to_bridge_line_flow = (
+            self.components.p4_port1_next_port1_line.port_mass_flow(
+                port_pressure_pa=p4_port1_next_primary_line.p,
+                port_temperature_k=p4_port1_next_primary_line.T,
+            )
+        )
+        p4_bridge_to_port1_next_line_flow = (
+            self.components.p4_port1_next_port1_line.port_mass_flow(
+                port_pressure_pa=p4_bridge_primary_line.p,
+                port_temperature_k=p4_bridge_primary_line.T,
+            )
+        )
+        p4_bridge_chamber_to_line_flow = (
+            self.components.p4_bridge_primary_line.resistance_mass_flow(
+                port_1_pressure_pa=p4_bridge_primary_chamber.p,
+                port_1_temperature_k=p4_bridge_primary_chamber.T,
+            )
+        )
         p4_port1_remote_node_to_orifice_line_flow = -self.components.p4_port1_remote_orifice_node.balance(
             port_2_temperature_k=p4_port1_remote_orifice_line_port_1.T,
             port_2_pressure_pa=p4_port1_remote_orifice_line_port_1.p,
@@ -664,6 +710,18 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
                 port_1_temperature_k=p4_port3_next_primary_chamber.T,
             )
         )
+        p4_bridge_to_port3_next_line_flow = (
+            self.components.p4_port3_next_port3_line.port_mass_flow(
+                port_pressure_pa=p4_bridge_primary_line.p,
+                port_temperature_k=p4_bridge_primary_line.T,
+            )
+        )
+        p4_port3_next_to_bridge_line_flow = (
+            self.components.p4_port3_next_port3_line.port_mass_flow(
+                port_pressure_pa=p4_port3_next_primary_line.p,
+                port_temperature_k=p4_port3_next_primary_line.T,
+            )
+        )
         p4_port3_remote_node_to_resistance_flow = (
             self.components.p4_port3_remote_orifice_resistance.mass_flow(
                 port_1_pressure_pa=p4_port3_remote_orifice_line_port_1.p,
@@ -812,8 +870,12 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
         p4_port1_next_balance = self.components.p4_port1_next_node.balance(
             port_2_temperature_k=p4_port1_next_primary_line.T,
             port_2_pressure_pa=p4_port1_next_primary_line.p,
-            port_1_enthalpy_flow_w=0.0,
+            port_1_enthalpy_flow_w=self._enthalpy_flow_from_node(
-            port_1_mass_flow_g_s=0.0,
+                flow_kg_s=p4_port1_next_to_bridge_line_flow,
+                node_h=p4_port1_next_primary_line.h,
+                connected_h=p4_port1_next_port1_line.h,
+            ),
+            port_1_mass_flow_g_s=-p4_port1_next_to_bridge_line_flow * 1.0e3,
             port_3_enthalpy_flow_w=self._enthalpy_flow_from_node(
                 flow_kg_s=p4_port1_next_node_to_line_flow,
                 node_h=p4_port1_next_primary_line.h,
@@ -885,14 +947,39 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
                 connected_h=p4_port3_far_port3_line.h,
             ),
             port_1_mass_flow_g_s=-p4_port3_next_node_to_line_flow * 1.0e3,
-            port_3_enthalpy_flow_w=0.0,
+            port_3_enthalpy_flow_w=self._enthalpy_flow_from_node(
-            port_3_mass_flow_g_s=0.0,
+                flow_kg_s=p4_port3_next_to_bridge_line_flow,
+                node_h=p4_port3_next_primary_line.h,
+                connected_h=p4_port3_next_port3_line.h,
+            ),
+            port_3_mass_flow_g_s=-p4_port3_next_to_bridge_line_flow * 1.0e3,
             port_4_enthalpy_flow_w=0.0,
             port_4_mass_flow_g_s=0.0,
         )
         p4_port3_next_node_to_primary_line_flow = (
             p4_port3_next_balance.port_2_mass_flow_g_s * 1.0e-3
         )
+        p4_bridge_balance = self.components.p4_bridge_node.balance(
+            port_2_temperature_k=p4_bridge_primary_line.T,
+            port_2_pressure_pa=p4_bridge_primary_line.p,
+            port_1_enthalpy_flow_w=self._enthalpy_flow_from_node(
+                flow_kg_s=p4_bridge_to_port3_next_line_flow,
+                node_h=p4_bridge_primary_line.h,
+                connected_h=p4_port3_next_port3_line.h,
+            ),
+            port_1_mass_flow_g_s=-p4_bridge_to_port3_next_line_flow * 1.0e3,
+            port_3_enthalpy_flow_w=self._enthalpy_flow_from_node(
+                flow_kg_s=p4_bridge_to_port1_next_line_flow,
+                node_h=p4_bridge_primary_line.h,
+                connected_h=p4_port1_next_port1_line.h,
+            ),
+            port_3_mass_flow_g_s=-p4_bridge_to_port1_next_line_flow * 1.0e3,
+            port_4_enthalpy_flow_w=0.0,
+            port_4_mass_flow_g_s=0.0,
+        )
+        p4_bridge_node_to_primary_line_flow = (
+            p4_bridge_balance.port_2_mass_flow_g_s * 1.0e-3
+        )
 
         snapshot = TestMqlPn3P4NodeChamberSegmentSnapshot(
             inlet_line=inlet_line,
@@ -912,6 +999,9 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             p4_port1_far_port1_line=p4_port1_far_port1_line,
             p4_port1_next_primary_line=p4_port1_next_primary_line,
             p4_port1_next_primary_chamber=p4_port1_next_primary_chamber,
+            p4_port1_next_port1_line=p4_port1_next_port1_line,
+            p4_bridge_primary_line=p4_bridge_primary_line,
+            p4_bridge_primary_chamber=p4_bridge_primary_chamber,
             p4_port1_remote_orifice_line_port_1=p4_port1_remote_orifice_line_port_1,
             p4_port1_remote_orifice_line_port_2=p4_port1_remote_orifice_line_port_2,
             p4_port3_line=p4_port3_line,
@@ -923,6 +1013,7 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             p4_port3_far_port3_line=p4_port3_far_port3_line,
             p4_port3_next_primary_line=p4_port3_next_primary_line,
             p4_port3_next_primary_chamber=p4_port3_next_primary_chamber,
+            p4_port3_next_port3_line=p4_port3_next_port3_line,
             p4_port3_remote_orifice_line_port_1=p4_port3_remote_orifice_line_port_1,
             p4_port3_remote_orifice_line_port_2=p4_port3_remote_orifice_line_port_2,
             p4_port3_remote_resistance_node_line_port_1=(
@@ -938,6 +1029,7 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             p4_port1_remote_balance=p4_port1_remote_balance,
             p4_port1_far_balance=p4_port1_far_balance,
             p4_port1_next_balance=p4_port1_next_balance,
+            p4_bridge_balance=p4_bridge_balance,
             p4_port1_remote_orifice_node_balance=p4_port1_remote_orifice_node_balance,
             p4_port3_remote_balance=p4_port3_remote_balance,
             p4_port3_far_balance=p4_port3_far_balance,
@@ -974,6 +1066,10 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             p4_port1_next_node_to_primary_line_flow=(
                 p4_port1_next_node_to_primary_line_flow
             ),
+            p4_port1_next_to_bridge_line_flow=p4_port1_next_to_bridge_line_flow,
+            p4_bridge_to_port1_next_line_flow=p4_bridge_to_port1_next_line_flow,
+            p4_bridge_chamber_to_line_flow=p4_bridge_chamber_to_line_flow,
+            p4_bridge_node_to_primary_line_flow=p4_bridge_node_to_primary_line_flow,
             p4_port1_remote_node_to_orifice_line_flow=(
                 p4_port1_remote_node_to_orifice_line_flow
             ),
@@ -999,6 +1095,8 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             p4_port3_next_node_to_primary_line_flow=(
                 p4_port3_next_node_to_primary_line_flow
             ),
+            p4_bridge_to_port3_next_line_flow=p4_bridge_to_port3_next_line_flow,
+            p4_port3_next_to_bridge_line_flow=p4_port3_next_to_bridge_line_flow,
             p4_port3_remote_node_to_orifice_line_flow=(
                 p4_port3_remote_node_to_orifice_line_flow
             ),
@@ -1232,6 +1330,27 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
         p4_port1_next_primary_chamber.port_a.m_flow = -snapshot.p4_port1_next_chamber_to_line_flow
         p4_port1_next_primary_chamber.port_a.h_outflow = snapshot.p4_port1_next_primary_chamber.h
 
+        p4_port1_next_port1_line = self.components.p4_port1_next_port1_line
+        p4_port1_next_port1_line.port_1.p = snapshot.p4_port1_next_primary_line.p
+        p4_port1_next_port1_line.port_1.m_flow = snapshot.p4_port1_next_to_bridge_line_flow
+        p4_port1_next_port1_line.port_1.h_outflow = snapshot.p4_port1_next_port1_line.h
+        p4_port1_next_port1_line.port_2.p = snapshot.p4_bridge_primary_line.p
+        p4_port1_next_port1_line.port_2.m_flow = snapshot.p4_bridge_to_port1_next_line_flow
+        p4_port1_next_port1_line.port_2.h_outflow = snapshot.p4_port1_next_port1_line.h
+
+        p4_bridge_primary_line = self.components.p4_bridge_primary_line
+        p4_bridge_primary_line.port_1.p = snapshot.p4_bridge_primary_chamber.p
+        p4_bridge_primary_line.port_1.m_flow = snapshot.p4_bridge_chamber_to_line_flow
+        p4_bridge_primary_line.port_1.h_outflow = snapshot.p4_bridge_primary_line.h
+        p4_bridge_primary_line.port_2.p = snapshot.p4_bridge_primary_line.p
+        p4_bridge_primary_line.port_2.m_flow = snapshot.p4_bridge_node_to_primary_line_flow
+        p4_bridge_primary_line.port_2.h_outflow = snapshot.p4_bridge_primary_line.h
+
+        p4_bridge_primary_chamber = self.components.p4_bridge_primary_chamber
+        p4_bridge_primary_chamber.port_a.p = snapshot.p4_bridge_primary_chamber.p
+        p4_bridge_primary_chamber.port_a.m_flow = -snapshot.p4_bridge_chamber_to_line_flow
+        p4_bridge_primary_chamber.port_a.h_outflow = snapshot.p4_bridge_primary_chamber.h
+
         p4_port1_remote_orifice_line = self.components.p4_port1_remote_orifice_line
         p4_port1_remote_orifice_line.port_1.p = snapshot.p4_port1_remote_orifice_line_port_1.p
         p4_port1_remote_orifice_line.port_1.m_flow = snapshot.p4_port1_remote_node_to_orifice_line_flow
@@ -1329,6 +1448,14 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
         p4_port3_next_primary_chamber.port_a.m_flow = -snapshot.p4_port3_next_chamber_to_line_flow
         p4_port3_next_primary_chamber.port_a.h_outflow = snapshot.p4_port3_next_primary_chamber.h
 
+        p4_port3_next_port3_line = self.components.p4_port3_next_port3_line
+        p4_port3_next_port3_line.port_1.p = snapshot.p4_bridge_primary_line.p
+        p4_port3_next_port3_line.port_1.m_flow = snapshot.p4_bridge_to_port3_next_line_flow
+        p4_port3_next_port3_line.port_1.h_outflow = snapshot.p4_port3_next_port3_line.h
+        p4_port3_next_port3_line.port_2.p = snapshot.p4_port3_next_primary_line.p
+        p4_port3_next_port3_line.port_2.m_flow = snapshot.p4_port3_next_to_bridge_line_flow
+        p4_port3_next_port3_line.port_2.h_outflow = snapshot.p4_port3_next_port3_line.h
+
         p4_port3_remote_orifice_line = self.components.p4_port3_remote_orifice_line
         p4_port3_remote_orifice_line.port_1.p = snapshot.p4_port3_remote_orifice_line_port_1.p
         p4_port3_remote_orifice_line.port_1.m_flow = snapshot.p4_port3_remote_node_to_orifice_line_flow
@@ -1498,6 +1625,31 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
                 internal_h=snapshot.p4_port1_next_primary_chamber.h,
             )
         )
+        p4_port1_next_port1_derivative = (
+            self.components.p4_port1_next_port1_line.derivatives_from_connections(
+                port_1_m_flow=snapshot.p4_port1_next_to_bridge_line_flow,
+                connected_h_1=snapshot.p4_port1_next_primary_line.h,
+                port_2_m_flow=snapshot.p4_bridge_to_port1_next_line_flow,
+                connected_h_2=snapshot.p4_bridge_primary_line.h,
+            )
+        )
+        p4_bridge_primary_derivative = (
+            self.components.p4_bridge_primary_line.derivatives_from_connections(
+                port_1_m_flow=snapshot.p4_bridge_chamber_to_line_flow,
+                connected_h_1=snapshot.p4_bridge_primary_chamber.h,
+                port_2_m_flow=snapshot.p4_bridge_node_to_primary_line_flow,
+                connected_h_2=snapshot.p4_bridge_primary_line.h,
+            )
+        )
+        p4_bridge_chamber_derivative = (
+            self.components.p4_bridge_primary_chamber.derivatives_from_two_connections(
+                port_a_m_flow=-snapshot.p4_bridge_chamber_to_line_flow,
+                connected_h_a=snapshot.p4_bridge_primary_line.h,
+                port_b_m_flow=0.0,
+                connected_h_b=snapshot.p4_bridge_primary_chamber.h,
+                internal_h=snapshot.p4_bridge_primary_chamber.h,
+            )
+        )
         p4_port1_remote_orifice_derivative_1, p4_port1_remote_orifice_derivative_2 = (
             self.components.p4_port1_remote_orifice_line.derivatives_from_connections(
                 port_1_m_flow=snapshot.p4_port1_remote_node_to_orifice_line_flow,
@@ -1579,6 +1731,14 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
                 internal_h=snapshot.p4_port3_next_primary_chamber.h,
             )
         )
+        p4_port3_next_port3_derivative = (
+            self.components.p4_port3_next_port3_line.derivatives_from_connections(
+                port_1_m_flow=snapshot.p4_bridge_to_port3_next_line_flow,
+                connected_h_1=snapshot.p4_bridge_primary_line.h,
+                port_2_m_flow=snapshot.p4_port3_next_to_bridge_line_flow,
+                connected_h_2=snapshot.p4_port3_next_primary_line.h,
+            )
+        )
         (
             p4_port3_remote_resistance_derivative_1,
             p4_port3_remote_resistance_derivative_2,
@@ -1613,6 +1773,9 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             *p4_port1_far_port1_derivative.as_vector(),
             *p4_port1_next_primary_derivative.as_vector(),
             *p4_port1_next_chamber_derivative.as_vector(),
+            *p4_port1_next_port1_derivative.as_vector(),
+            *p4_bridge_primary_derivative.as_vector(),
+            *p4_bridge_chamber_derivative.as_vector(),
             *p4_port1_remote_orifice_derivative_1.as_vector(),
             *p4_port1_remote_orifice_derivative_2.as_vector(),
             *p4_port3_derivative.as_vector(),
@@ -1624,6 +1787,7 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             *p4_port3_far_port3_derivative.as_vector(),
             *p4_port3_next_primary_derivative.as_vector(),
             *p4_port3_next_chamber_derivative.as_vector(),
+            *p4_port3_next_port3_derivative.as_vector(),
             *p4_port3_remote_resistance_derivative_1.as_vector(),
             *p4_port3_remote_resistance_derivative_2.as_vector(),
             *p4_port3_remote_orifice_derivative_1.as_vector(),

tests/test_test_mql_pnl0001_segment.py

@@ -298,6 +298,10 @@ class TestMqlPn3P4NodeChamberSegmentTests(unittest.TestCase):
             closure.components.p4_port1_next_primary_chamber.name,
             "pn_c1_12",
         )
+        self.assertEqual(closure.components.p4_port1_next_port1_line.name, "pneumatic_81")
+        self.assertEqual(closure.components.p4_bridge_node.alias, "pnnode4_20")
+        self.assertEqual(closure.components.p4_bridge_primary_line.name, "pneumatic_72")
+        self.assertEqual(closure.components.p4_bridge_primary_chamber.name, "pn_c1_13")
         self.assertEqual(
             closure.components.p4_port1_remote_orifice.name,
             "pn_morifice_10",
@@ -343,6 +347,7 @@ class TestMqlPn3P4NodeChamberSegmentTests(unittest.TestCase):
             closure.components.p4_port3_next_primary_chamber.name,
             "pn_c1_14",
         )
+        self.assertEqual(closure.components.p4_port3_next_port3_line.name, "pneumatic_84")
         self.assertEqual(
             closure.components.p4_port3_remote_orifice.name,
             "pn_morifice_1",
@@ -371,8 +376,8 @@ class TestMqlPn3P4NodeChamberSegmentTests(unittest.TestCase):
             closure.components.p4_port3_remote_resistance_orifice.name,
             "pn_morifice_14",
         )
-        self.assertEqual(len(closure.initial_state_vector()), 62)
+        self.assertEqual(len(closure.initial_state_vector()), 70)
-        self.assertEqual(len(rhs), 62)
+        self.assertEqual(len(rhs), 70)
         self.assertAlmostEqual(
             snapshot.p4_balance.pressure_pa,
             snapshot.p4_primary_line.p,
@@ -441,6 +446,24 @@ class TestMqlPn3P4NodeChamberSegmentTests(unittest.TestCase):
                 port1_far_port1.remote_node_alias
             ).line_alias,
         )
+        port1_next_port1 = self.system._pnl0002_connection_for_node_port(
+            closure.components.p4_port1_next_node.alias,
+            "port_1",
+        )
+        self.assertEqual(
+            closure.components.p4_port1_next_port1_line.name,
+            port1_next_port1.line_alias,
+        )
+        self.assertEqual(
+            closure.components.p4_bridge_node.alias,
+            port1_next_port1.remote_node_alias,
+        )
+        self.assertEqual(
+            closure.components.p4_bridge_primary_line.name,
+            self.system._p4_primary_connection_for_node(
+                closure.components.p4_bridge_node.alias
+            ).line_alias,
+        )
         self.assertEqual(
             closure.components.p4_port1_remote_orifice.name,
             port1_remote_neighborhood.port_4.orifice_alias,
@@ -496,6 +519,18 @@ class TestMqlPn3P4NodeChamberSegmentTests(unittest.TestCase):
                 port3_far_port3.remote_node_alias
             ).line_alias,
         )
+        port3_next_port3 = self.system._pnl0002_connection_for_node_port(
+            closure.components.p4_port3_next_node.alias,
+            "port_3",
+        )
+        self.assertEqual(
+            closure.components.p4_port3_next_port3_line.name,
+            port3_next_port3.line_alias,
+        )
+        self.assertEqual(
+            closure.components.p4_bridge_node.alias,
+            port3_next_port3.remote_node_alias,
+        )
         self.assertEqual(
             closure.components.p4_port3_remote_orifice.name,
             port3_remote_neighborhood.port_4.orifice_alias,
@@ -578,7 +613,15 @@ class TestMqlPn3P4NodeChamberSegmentTests(unittest.TestCase):
         )
         self.assertAlmostEqual(
             snapshot.p4_port1_next_node_to_primary_line_flow
-            + snapshot.p4_port1_next_node_to_line_flow,
+            + snapshot.p4_port1_next_node_to_line_flow
+            + snapshot.p4_port1_next_to_bridge_line_flow,
+            0.0,
+            delta=1.0e-12,
+        )
+        self.assertAlmostEqual(
+            snapshot.p4_bridge_node_to_primary_line_flow
+            + snapshot.p4_bridge_to_port1_next_line_flow
+            + snapshot.p4_bridge_to_port3_next_line_flow,
             0.0,
             delta=1.0e-12,
         )
@@ -617,18 +660,19 @@ class TestMqlPn3P4NodeChamberSegmentTests(unittest.TestCase):
         )
         self.assertAlmostEqual(
             snapshot.p4_port3_next_node_to_primary_line_flow
-            + snapshot.p4_port3_next_node_to_line_flow,
+            + snapshot.p4_port3_next_node_to_line_flow
+            + snapshot.p4_port3_next_to_bridge_line_flow,
             0.0,
             delta=1.0e-12,
         )
-        mass_derivative_sum = sum(rhs[index] for index in range(0, 62, 2))
+        mass_derivative_sum = sum(rhs[index] for index in range(0, 70, 2))
         self.assertAlmostEqual(
             mass_derivative_sum,
             0.0,
             delta=1.0e-12,
         )
 
-    def test_simulates_sixty_two_state_pn3_p4_node_chamber_segment(self) -> None:
+    def test_simulates_seventy_state_pn3_p4_node_chamber_segment(self) -> None:
         solution = self.system.simulate_pn3_p4_node_chamber_segment_from_spec(
             self.spec,
             inlet_node_pressure_pa=15.31e6,
@@ -643,8 +687,8 @@ class TestMqlPn3P4NodeChamberSegmentTests(unittest.TestCase):
 
         self.assertTrue(solution.success)
         self.assertEqual(len(solution.t), 3)
-        self.assertEqual(len(solution.y), 62)
+        self.assertEqual(len(solution.y), 70)
-        self.assertEqual([len(row) for row in solution.y], [3] * 62)
+        self.assertEqual([len(row) for row in solution.y], [3] * 70)
 
 
 if __name__ == "__main__":