PythonModels/systems/test_mql.py

@@ -4839,6 +4839,45 @@ class TestMqlSystem:
         p4_port3_next_chamber_outlet_orifice = self.pneumatic_assembly.fixed_orifices[
             p4_port3_next_chamber_spec.outlet_orifice_alias
         ]
+        p4_port3_next_orifice_resistance = self._pnl00r_line_for_node_port(
+            p4_port3_next_orifice_node.alias,
+            "port_3",
+        )
+        p4_port3_next_resistance_node = other_node3_for_pnl00r(
+            p4_port3_next_orifice_resistance.name,
+            p4_port3_next_orifice_node.alias,
+        )
+        p4_port3_next_resistance_node_line_spec = self._pnl0003_spec_for_node_port(
+            p4_port3_next_resistance_node.alias,
+            "port_2",
+        )
+        p4_port3_next_resistance_node_line = self.pnl0003_assembly.lines[
+            p4_port3_next_resistance_node_line_spec.alias
+        ]
+        p4_port3_next_resistance_orifice_alias = (
+            p4_port3_next_resistance_node_line_spec.target_component
+            if p4_port3_next_resistance_node_line_spec.source_component
+            == p4_port3_next_resistance_node.alias
+            else p4_port3_next_resistance_node_line_spec.source_component
+        )
+        p4_port3_next_resistance_orifice = self.pneumatic_assembly.variable_orifices[
+            p4_port3_next_resistance_orifice_alias
+        ]
+        p4_port3_next_resistance_output_spec = self._pnl0001_spec_for_node_port(
+            p4_bridge_node_alias,
+            "port_4",
+        )
+        if (
+            p4_port3_next_resistance_output_spec.source_component
+            != p4_port3_next_resistance_orifice_alias
+        ):
+            raise ValueError(
+                f"{p4_port3_next_resistance_output_spec.alias} is not fed by "
+                f"{p4_port3_next_resistance_orifice_alias}"
+            )
+        p4_port3_next_resistance_output_line = self.pnl0001_assembly.lines[
+            p4_port3_next_resistance_output_spec.alias
+        ]
         p4_port3_remote_orifice = self.pneumatic_assembly.variable_orifices[
             p4_port3_remote_neighborhood.port_4.orifice_alias
         ]
@@ -4936,6 +4975,10 @@ class TestMqlSystem:
             raise TypeError(
                 f"{p4_port3_next_chamber_spec.outlet_orifice_alias} is not an AMESim pneumatic orifice"
             )
+        if not isinstance(p4_port3_next_resistance_orifice, AmesimPneumaticOrifice):
+            raise TypeError(
+                f"{p4_port3_next_resistance_orifice_alias} is not an AMESim pneumatic orifice"
+            )
         if not isinstance(p4_bridge_primary_chamber, AmesimPneumaticVolume):
             raise TypeError(
                 f"{p4_bridge_primary_chamber_alias} is not an AMESim pneumatic volume"
@@ -5005,6 +5048,11 @@ class TestMqlSystem:
                 p4_port3_next_chamber_inlet_orifice=p4_port3_next_chamber_inlet_orifice,
                 p4_port3_next_chamber_outlet_orifice=p4_port3_next_chamber_outlet_orifice,
                 p4_port3_next_chamber_spec=p4_port3_next_chamber_spec,
+                p4_port3_next_orifice_resistance=p4_port3_next_orifice_resistance,
+                p4_port3_next_resistance_node=p4_port3_next_resistance_node,
+                p4_port3_next_resistance_node_line=p4_port3_next_resistance_node_line,
+                p4_port3_next_resistance_orifice=p4_port3_next_resistance_orifice,
+                p4_port3_next_resistance_output_line=p4_port3_next_resistance_output_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

@@ -241,6 +241,11 @@ class TestMqlPn3P4NodeChamberSegmentComponents:
     p4_port3_next_chamber_inlet_orifice: AmesimPneumaticOrifice
     p4_port3_next_chamber_outlet_orifice: AmesimPneumaticOrifice
     p4_port3_next_chamber_spec: TestMqlPneumaticChamberSegmentSpec
+    p4_port3_next_orifice_resistance: AmesimPnl00rPipe
+    p4_port3_next_resistance_node: TestMqlPneumaticNode3
+    p4_port3_next_resistance_node_line: AmesimPnl0003Pipe
+    p4_port3_next_resistance_orifice: AmesimPneumaticOrifice
+    p4_port3_next_resistance_output_line: AmesimPnl0001Pipe
     p4_port3_remote_orifice: AmesimPneumaticOrifice
     p4_port3_remote_orifice_line: AmesimPnl0003Pipe
     p4_port3_remote_orifice_node: TestMqlPneumaticNode3
@@ -295,6 +300,9 @@ class TestMqlPn3P4NodeChamberSegmentSnapshot:
     p4_port3_next_chamber_inlet_line: ThermodynamicProperties
     p4_port3_next_chamber: ThermodynamicProperties
     p4_port3_next_chamber_outlet_line: ThermodynamicProperties
+    p4_port3_next_resistance_node_line_port_1: ThermodynamicProperties
+    p4_port3_next_resistance_node_line_port_2: ThermodynamicProperties
+    p4_port3_next_resistance_output_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
@@ -313,6 +321,7 @@ class TestMqlPn3P4NodeChamberSegmentSnapshot:
     p4_port3_far_balance: TestMqlPneumaticNode4Balance
     p4_port3_next_balance: TestMqlPneumaticNode4Balance
     p4_port3_next_orifice_node_balance: TestMqlPneumaticNode3Balance
+    p4_port3_next_resistance_node_balance: TestMqlPneumaticNode3Balance
     p4_port3_remote_orifice_node_balance: TestMqlPneumaticNode3Balance
     p4_port3_remote_resistance_node_balance: TestMqlPneumaticNode3Balance
     inlet_node_to_line_flow: float
@@ -366,6 +375,11 @@ class TestMqlPn3P4NodeChamberSegmentSnapshot:
     p4_port3_next_chamber_inlet_line_to_chamber_flow: float
     p4_port3_next_chamber_outlet_node_to_line_flow: float
     p4_port3_next_chamber_outlet_line_to_chamber_flow: float
+    p4_port3_next_resistance_node_to_next_flow: float
+    p4_port3_next_resistance_node_to_line_flow: float
+    p4_port3_next_resistance_line_center_flow: float
+    p4_port3_next_resistance_to_output_line_flow: float
+    p4_port3_next_resistance_output_to_p4_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
@@ -434,11 +448,13 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             *self.components.p4_port3_next_chamber_inlet_line.get_state_vector(),
             *self.components.p4_port3_next_chamber.get_state_vector(),
             *self.components.p4_port3_next_chamber_outlet_line.get_state_vector(),
+            *self.components.p4_port3_next_resistance_node_line.get_state_vector(),
+            *self.components.p4_port3_next_resistance_output_line.get_state_vector(),
         ]
 
     def apply_state_vector(self, values: list[float]) -> None:
-        if len(values) != 84:
+        if len(values) != 90:
-            raise ValueError("PN3/P4 node chamber segment state vector requires eighty-four values")
+            raise ValueError("PN3/P4 node chamber segment state vector requires ninety 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])
@@ -475,7 +491,9 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
         self.components.p4_port3_next_orifice_output_line.set_state_vector(values[76:78])
         self.components.p4_port3_next_chamber_inlet_line.set_state_vector(values[78:80])
         self.components.p4_port3_next_chamber.set_state_vector(values[80:82])
-        self.components.p4_port3_next_chamber_outlet_line.set_state_vector(values[82:])
+        self.components.p4_port3_next_chamber_outlet_line.set_state_vector(values[82:84])
+        self.components.p4_port3_next_resistance_node_line.set_state_vector(values[84:88])
+        self.components.p4_port3_next_resistance_output_line.set_state_vector(values[88:])
 
     def snapshot(
         self,
@@ -554,6 +572,15 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
         p4_port3_next_chamber_outlet_line = (
             self.components.p4_port3_next_chamber_outlet_line.properties()
         )
+        p4_port3_next_resistance_node_line_port_1 = (
+            self.components.p4_port3_next_resistance_node_line.properties_1()
+        )
+        p4_port3_next_resistance_node_line_port_2 = (
+            self.components.p4_port3_next_resistance_node_line.properties_2()
+        )
+        p4_port3_next_resistance_output_line = (
+            self.components.p4_port3_next_resistance_output_line.properties()
+        )
         p4_port3_remote_orifice_line_port_1 = (
             self.components.p4_port3_remote_orifice_line.properties_1()
         )
@@ -803,6 +830,14 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             chamber=p4_port3_next_chamber,
             orifice=self.components.p4_port3_next_chamber_outlet_orifice,
         )
+        p4_port3_next_resistance_node_to_next_flow = (
+            self.components.p4_port3_next_orifice_resistance.mass_flow(
+                port_1_pressure_pa=p4_port3_next_resistance_node_line_port_1.p,
+                port_1_temperature_k=p4_port3_next_resistance_node_line_port_1.T,
+                port_2_pressure_pa=p4_port3_next_orifice_line_port_1.p,
+                port_2_temperature_k=p4_port3_next_orifice_line_port_1.T,
+            )
+        )
         p4_port3_next_orifice_node_balance = (
             self.components.p4_port3_next_orifice_node.balance(
                 port_2_temperature_k=p4_port3_next_orifice_line_port_1.T,
@@ -813,8 +848,12 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
                     connected_h=p4_port3_next_chamber_inlet_line.h,
                 ),
                 port_1_mass_flow_g_s=p4_port3_next_chamber_inlet_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_resistance_node_to_next_flow,
+                    node_h=p4_port3_next_orifice_line_port_1.h,
+                    connected_h=p4_port3_next_resistance_node_line_port_1.h,
+                ),
+                port_3_mass_flow_g_s=-p4_port3_next_resistance_node_to_next_flow * 1.0e3,
             )
         )
         p4_port3_next_orifice_node_to_line_flow = (
@@ -831,6 +870,34 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
         p4_port3_next_orifice_output_to_p4_flow = (
             p4_port3_next_orifice_to_output_line_flow
         )
+        p4_port3_next_resistance_node_balance = (
+            self.components.p4_port3_next_resistance_node.balance(
+                port_2_temperature_k=p4_port3_next_resistance_node_line_port_1.T,
+                port_2_pressure_pa=p4_port3_next_resistance_node_line_port_1.p,
+                port_1_enthalpy_flow_w=self._enthalpy_flow_from_node(
+                    flow_kg_s=p4_port3_next_resistance_node_to_next_flow,
+                    node_h=p4_port3_next_resistance_node_line_port_1.h,
+                    connected_h=p4_port3_next_orifice_line_port_1.h,
+                ),
+                port_1_mass_flow_g_s=p4_port3_next_resistance_node_to_next_flow * 1.0e3,
+                port_3_enthalpy_flow_w=0.0,
+                port_3_mass_flow_g_s=0.0,
+            )
+        )
+        p4_port3_next_resistance_node_to_line_flow = (
+            -p4_port3_next_resistance_node_balance.port_2_mass_flow_g_s * 1.0e-3
+        )
+        p4_port3_next_resistance_line_center_flow = (
+            self.components.p4_port3_next_resistance_node_line.resistance_mass_flow()
+        )
+        p4_port3_next_resistance_to_output_line_flow = self._line_to_p4_flow(
+            line=p4_port3_next_resistance_node_line_port_2,
+            p4_boundary=p4_port3_next_resistance_output_line,
+            orifice=self.components.p4_port3_next_resistance_orifice,
+        )
+        p4_port3_next_resistance_output_to_p4_flow = (
+            p4_port3_next_resistance_to_output_line_flow
+        )
         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,
@@ -1094,8 +1161,12 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
                 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_enthalpy_flow_w=self._enthalpy_flow_from_node(
-            port_4_mass_flow_g_s=0.0,
+                flow_kg_s=p4_port3_next_resistance_output_to_p4_flow,
+                node_h=p4_port3_next_resistance_output_line.h,
+                connected_h=p4_bridge_primary_line.h,
+            ),
+            port_4_mass_flow_g_s=p4_port3_next_resistance_output_to_p4_flow * 1.0e3,
         )
         p4_bridge_node_to_primary_line_flow = (
             p4_bridge_balance.port_2_mass_flow_g_s * 1.0e-3
@@ -1140,6 +1211,13 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             p4_port3_next_chamber_inlet_line=p4_port3_next_chamber_inlet_line,
             p4_port3_next_chamber=p4_port3_next_chamber,
             p4_port3_next_chamber_outlet_line=p4_port3_next_chamber_outlet_line,
+            p4_port3_next_resistance_node_line_port_1=(
+                p4_port3_next_resistance_node_line_port_1
+            ),
+            p4_port3_next_resistance_node_line_port_2=(
+                p4_port3_next_resistance_node_line_port_2
+            ),
+            p4_port3_next_resistance_output_line=p4_port3_next_resistance_output_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=(
@@ -1164,6 +1242,7 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             p4_port3_far_balance=p4_port3_far_balance,
             p4_port3_next_balance=p4_port3_next_balance,
             p4_port3_next_orifice_node_balance=p4_port3_next_orifice_node_balance,
+            p4_port3_next_resistance_node_balance=p4_port3_next_resistance_node_balance,
             p4_port3_remote_orifice_node_balance=p4_port3_remote_orifice_node_balance,
             p4_port3_remote_resistance_node_balance=(
                 p4_port3_remote_resistance_node_balance
@@ -1251,6 +1330,21 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             p4_port3_next_chamber_outlet_line_to_chamber_flow=(
                 p4_port3_next_chamber_outlet_line_to_chamber_flow
             ),
+            p4_port3_next_resistance_node_to_next_flow=(
+                p4_port3_next_resistance_node_to_next_flow
+            ),
+            p4_port3_next_resistance_node_to_line_flow=(
+                p4_port3_next_resistance_node_to_line_flow
+            ),
+            p4_port3_next_resistance_line_center_flow=(
+                p4_port3_next_resistance_line_center_flow
+            ),
+            p4_port3_next_resistance_to_output_line_flow=(
+                p4_port3_next_resistance_to_output_line_flow
+            ),
+            p4_port3_next_resistance_output_to_p4_flow=(
+                p4_port3_next_resistance_output_to_p4_flow
+            ),
             p4_port3_remote_node_to_orifice_line_flow=(
                 p4_port3_remote_node_to_orifice_line_flow
             ),
@@ -1674,6 +1768,38 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             chamber_properties=snapshot.p4_port3_next_chamber,
         )
 
+        p4_port3_next_orifice_resistance = self.components.p4_port3_next_orifice_resistance
+        p4_port3_next_orifice_resistance.port_1.p = snapshot.p4_port3_next_resistance_node_line_port_1.p
+        p4_port3_next_orifice_resistance.port_1.m_flow = snapshot.p4_port3_next_resistance_node_to_next_flow
+        p4_port3_next_orifice_resistance.port_1.h_outflow = snapshot.p4_port3_next_resistance_node_line_port_1.h
+        p4_port3_next_orifice_resistance.port_2.p = snapshot.p4_port3_next_orifice_line_port_1.p
+        p4_port3_next_orifice_resistance.port_2.m_flow = -snapshot.p4_port3_next_resistance_node_to_next_flow
+        p4_port3_next_orifice_resistance.port_2.h_outflow = snapshot.p4_port3_next_orifice_line_port_1.h
+
+        p4_port3_next_resistance_node_line = self.components.p4_port3_next_resistance_node_line
+        p4_port3_next_resistance_node_line.port_1.p = snapshot.p4_port3_next_resistance_node_line_port_1.p
+        p4_port3_next_resistance_node_line.port_1.m_flow = snapshot.p4_port3_next_resistance_node_to_line_flow
+        p4_port3_next_resistance_node_line.port_1.h_outflow = snapshot.p4_port3_next_resistance_node_line_port_1.h
+        p4_port3_next_resistance_node_line.port_2.p = snapshot.p4_port3_next_resistance_node_line_port_2.p
+        p4_port3_next_resistance_node_line.port_2.m_flow = -snapshot.p4_port3_next_resistance_to_output_line_flow
+        p4_port3_next_resistance_node_line.port_2.h_outflow = snapshot.p4_port3_next_resistance_node_line_port_2.h
+
+        p4_port3_next_resistance_orifice = self.components.p4_port3_next_resistance_orifice
+        p4_port3_next_resistance_orifice.port_a.p = snapshot.p4_port3_next_resistance_node_line_port_2.p
+        p4_port3_next_resistance_orifice.port_a.m_flow = snapshot.p4_port3_next_resistance_to_output_line_flow
+        p4_port3_next_resistance_orifice.port_a.h_outflow = snapshot.p4_port3_next_resistance_node_line_port_2.h
+        p4_port3_next_resistance_orifice.port_b.p = snapshot.p4_port3_next_resistance_output_line.p
+        p4_port3_next_resistance_orifice.port_b.m_flow = -snapshot.p4_port3_next_resistance_to_output_line_flow
+        p4_port3_next_resistance_orifice.port_b.h_outflow = snapshot.p4_port3_next_resistance_output_line.h
+
+        p4_port3_next_resistance_output_line = self.components.p4_port3_next_resistance_output_line
+        p4_port3_next_resistance_output_line.port_1.p = snapshot.p4_port3_next_resistance_node_line_port_2.p
+        p4_port3_next_resistance_output_line.port_1.m_flow = snapshot.p4_port3_next_resistance_to_output_line_flow
+        p4_port3_next_resistance_output_line.port_1.h_outflow = snapshot.p4_port3_next_resistance_output_line.h
+        p4_port3_next_resistance_output_line.port_2.p = snapshot.p4_port3_next_resistance_output_line.p
+        p4_port3_next_resistance_output_line.port_2.m_flow = -snapshot.p4_port3_next_resistance_output_to_p4_flow
+        p4_port3_next_resistance_output_line.port_2.h_outflow = snapshot.p4_port3_next_resistance_output_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
@@ -2041,6 +2167,23 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
                 connected_h_2=snapshot.p4_port3_next_chamber.h,
             )
         )
+        (
+            p4_port3_next_resistance_derivative_1,
+            p4_port3_next_resistance_derivative_2,
+        ) = self.components.p4_port3_next_resistance_node_line.derivatives_from_connections(
+            port_1_m_flow=snapshot.p4_port3_next_resistance_node_to_line_flow,
+            connected_h_1=snapshot.p4_port3_next_resistance_node_line_port_1.h,
+            port_2_m_flow=-snapshot.p4_port3_next_resistance_to_output_line_flow,
+            connected_h_2=snapshot.p4_port3_next_resistance_output_line.h,
+        )
+        p4_port3_next_resistance_output_derivative = (
+            self.components.p4_port3_next_resistance_output_line.derivatives_from_connections(
+                port_1_m_flow=snapshot.p4_port3_next_resistance_to_output_line_flow,
+                connected_h_1=snapshot.p4_port3_next_resistance_node_line_port_2.h,
+                port_2_m_flow=-snapshot.p4_port3_next_resistance_output_to_p4_flow,
+                connected_h_2=snapshot.p4_bridge_primary_line.h,
+            )
+        )
         return [
             *inlet_derivative.as_vector(),
             *chamber_derivative.as_vector(),
@@ -2084,6 +2227,9 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             *p4_port3_next_chamber_inlet_derivative.as_vector(),
             *p4_port3_next_fixed_chamber_derivative.as_vector(),
             *p4_port3_next_chamber_outlet_derivative.as_vector(),
+            *p4_port3_next_resistance_derivative_1.as_vector(),
+            *p4_port3_next_resistance_derivative_2.as_vector(),
+            *p4_port3_next_resistance_output_derivative.as_vector(),
         ]
 
 

tests/test_test_mql_pnl0001_segment.py

@@ -416,8 +416,28 @@ class TestMqlPn3P4NodeChamberSegmentTests(unittest.TestCase):
             closure.components.p4_port3_remote_resistance_output_line.name,
             "pneumatic_94",
         )
-        self.assertEqual(len(closure.initial_state_vector()), 84)
+        self.assertEqual(
-        self.assertEqual(len(rhs), 84)
+            closure.components.p4_port3_next_orifice_resistance.name,
+            "pneumatic_106",
+        )
+        self.assertEqual(
+            closure.components.p4_port3_next_resistance_node.alias,
+            "pn_node3_13",
+        )
+        self.assertEqual(
+            closure.components.p4_port3_next_resistance_node_line.name,
+            "pneumatic_78",
+        )
+        self.assertEqual(
+            closure.components.p4_port3_next_resistance_orifice.name,
+            "pn_morifice_12",
+        )
+        self.assertEqual(
+            closure.components.p4_port3_next_resistance_output_line.name,
+            "pneumatic_70",
+        )
+        self.assertEqual(len(closure.initial_state_vector()), 90)
+        self.assertEqual(len(rhs), 90)
         self.assertAlmostEqual(
             snapshot.p4_balance.pressure_pa,
             snapshot.p4_primary_line.p,
@@ -605,6 +625,29 @@ class TestMqlPn3P4NodeChamberSegmentTests(unittest.TestCase):
             closure.components.p4_port3_next_chamber_outlet_line.name,
             chamber_segment.outlet_line_alias,
         )
+        self.assertEqual(
+            closure.components.p4_port3_next_orifice_resistance.name,
+            self.system._pnl00r_line_for_node_port("pn_node3_14", "port_3").name,
+        )
+        self.assertEqual(
+            closure.components.p4_port3_next_resistance_node.alias,
+            "pn_node3_13",
+        )
+        self.assertEqual(
+            closure.components.p4_port3_next_resistance_node_line.name,
+            self.system._pnl0003_line_for_node_port("pn_node3_13", "port_2").name,
+        )
+        self.assertEqual(
+            closure.components.p4_port3_next_resistance_orifice.name,
+            "pn_morifice_12",
+        )
+        self.assertEqual(
+            closure.components.p4_port3_next_resistance_output_line.name,
+            self.system._pnl0001_line_for_node_port(
+                closure.components.p4_bridge_node.alias,
+                "port_4",
+            ).name,
+        )
         self.assertEqual(
             closure.components.p4_port3_remote_orifice.name,
             port3_remote_neighborhood.port_4.orifice_alias,
@@ -702,7 +745,8 @@ class TestMqlPn3P4NodeChamberSegmentTests(unittest.TestCase):
         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,
+            + snapshot.p4_bridge_to_port3_next_line_flow
+            - snapshot.p4_port3_next_resistance_output_to_p4_flow,
             0.0,
             delta=1.0e-12,
         )
@@ -756,7 +800,8 @@ class TestMqlPn3P4NodeChamberSegmentTests(unittest.TestCase):
         )
         self.assertAlmostEqual(
             snapshot.p4_port3_next_orifice_node_to_line_flow
-            + snapshot.p4_port3_next_chamber_inlet_node_to_line_flow,
+            + snapshot.p4_port3_next_chamber_inlet_node_to_line_flow
+            - snapshot.p4_port3_next_resistance_node_to_next_flow,
             0.0,
             delta=1.0e-12,
         )
@@ -765,6 +810,17 @@ class TestMqlPn3P4NodeChamberSegmentTests(unittest.TestCase):
             snapshot.p4_port3_next_orifice_to_output_line_flow,
             delta=1.0e-12,
         )
+        self.assertAlmostEqual(
+            snapshot.p4_port3_next_resistance_node_to_line_flow
+            + snapshot.p4_port3_next_resistance_node_to_next_flow,
+            0.0,
+            delta=1.0e-12,
+        )
+        self.assertAlmostEqual(
+            snapshot.p4_port3_next_resistance_output_to_p4_flow,
+            snapshot.p4_port3_next_resistance_to_output_line_flow,
+            delta=1.0e-12,
+        )
         next_chamber_mass_sum = rhs[78] + rhs[80] + rhs[82]
         self.assertAlmostEqual(
             next_chamber_mass_sum,
@@ -774,14 +830,14 @@ class TestMqlPn3P4NodeChamberSegmentTests(unittest.TestCase):
             ),
             delta=1.0e-12,
         )
-        mass_derivative_sum = sum(rhs[index] for index in range(0, 84, 2))
+        mass_derivative_sum = sum(rhs[index] for index in range(0, 90, 2))
         self.assertAlmostEqual(
             mass_derivative_sum,
             0.0,
             delta=1.0e-12,
         )
 
-    def test_simulates_eighty_four_state_pn3_p4_node_chamber_segment(self) -> None:
+    def test_simulates_ninety_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,
@@ -796,8 +852,8 @@ class TestMqlPn3P4NodeChamberSegmentTests(unittest.TestCase):
 
         self.assertTrue(solution.success)
         self.assertEqual(len(solution.t), 3)
-        self.assertEqual(len(solution.y), 84)
+        self.assertEqual(len(solution.y), 90)
-        self.assertEqual([len(row) for row in solution.y], [3] * 84)
+        self.assertEqual([len(row) for row in solution.y], [3] * 90)
 
 
 if __name__ == "__main__":