接入test_mql pn_node3_13固定气室支路

PythonModels/systems/test_mql.py

@@ -4624,6 +4624,15 @@ class TestMqlSystem:
                     return chamber_spec
             raise KeyError(f"No fixed chamber segment starts at {node_alias}")
 
+        def chamber_segment_for_outlet_node(node_alias: str):
+            chamber_specs = (
+                self.discover_pneumatic_branch_topology().chamber_segment_specs
+            )
+            for chamber_spec in chamber_specs:
+                if chamber_spec.outlet_node_alias == node_alias:
+                    return chamber_spec
+            raise KeyError(f"No fixed chamber segment ends at {node_alias}")
+
         inlet_line = self.pnl0001_assembly.lines[spec.inlet_line_alias]
         outlet_line = self.pnl0001_assembly.lines[spec.outlet_line_alias]
         node_line_spec = self._pnl0003_spec_for_node_port(
@@ -4878,6 +4887,28 @@ class TestMqlSystem:
         p4_port3_next_resistance_output_line = self.pnl0001_assembly.lines[
             p4_port3_next_resistance_output_spec.alias
         ]
+        p4_port3_next_resistance_chamber_spec = chamber_segment_for_outlet_node(
+            p4_port3_next_resistance_node.alias
+        )
+        p4_port3_next_resistance_chamber_inlet_line = self.pnl0001_assembly.lines[
+            p4_port3_next_resistance_chamber_spec.inlet_line_alias
+        ]
+        p4_port3_next_resistance_chamber = self.network.components[
+            p4_port3_next_resistance_chamber_spec.volume_alias
+        ]
+        p4_port3_next_resistance_chamber_outlet_line = self.pnl0001_assembly.lines[
+            p4_port3_next_resistance_chamber_spec.outlet_line_alias
+        ]
+        p4_port3_next_resistance_chamber_inlet_orifice = (
+            self.pneumatic_assembly.fixed_orifices[
+                p4_port3_next_resistance_chamber_spec.inlet_orifice_alias
+            ]
+        )
+        p4_port3_next_resistance_chamber_outlet_orifice = (
+            self.pneumatic_assembly.fixed_orifices[
+                p4_port3_next_resistance_chamber_spec.outlet_orifice_alias
+            ]
+        )
         p4_port3_remote_orifice = self.pneumatic_assembly.variable_orifices[
             p4_port3_remote_neighborhood.port_4.orifice_alias
         ]
@@ -4979,6 +5010,24 @@ class TestMqlSystem:
             raise TypeError(
                 f"{p4_port3_next_resistance_orifice_alias} is not an AMESim pneumatic orifice"
             )
+        if not isinstance(p4_port3_next_resistance_chamber, AmesimPneumaticVolume):
+            raise TypeError(
+                f"{p4_port3_next_resistance_chamber_spec.volume_alias} is not an AMESim pneumatic volume"
+            )
+        if not isinstance(
+            p4_port3_next_resistance_chamber_inlet_orifice,
+            AmesimPneumaticOrifice,
+        ):
+            raise TypeError(
+                f"{p4_port3_next_resistance_chamber_spec.inlet_orifice_alias} is not an AMESim pneumatic orifice"
+            )
+        if not isinstance(
+            p4_port3_next_resistance_chamber_outlet_orifice,
+            AmesimPneumaticOrifice,
+        ):
+            raise TypeError(
+                f"{p4_port3_next_resistance_chamber_spec.outlet_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"
@@ -5053,6 +5102,22 @@ class TestMqlSystem:
                 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_next_resistance_chamber_inlet_line=(
+                    p4_port3_next_resistance_chamber_inlet_line
+                ),
+                p4_port3_next_resistance_chamber=p4_port3_next_resistance_chamber,
+                p4_port3_next_resistance_chamber_outlet_line=(
+                    p4_port3_next_resistance_chamber_outlet_line
+                ),
+                p4_port3_next_resistance_chamber_inlet_orifice=(
+                    p4_port3_next_resistance_chamber_inlet_orifice
+                ),
+                p4_port3_next_resistance_chamber_outlet_orifice=(
+                    p4_port3_next_resistance_chamber_outlet_orifice
+                ),
+                p4_port3_next_resistance_chamber_spec=(
+                    p4_port3_next_resistance_chamber_spec
+                ),
                 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

@@ -246,6 +246,12 @@ class TestMqlPn3P4NodeChamberSegmentComponents:
     p4_port3_next_resistance_node_line: AmesimPnl0003Pipe
     p4_port3_next_resistance_orifice: AmesimPneumaticOrifice
     p4_port3_next_resistance_output_line: AmesimPnl0001Pipe
+    p4_port3_next_resistance_chamber_inlet_line: AmesimPnl0001Pipe
+    p4_port3_next_resistance_chamber: AmesimPneumaticVolume
+    p4_port3_next_resistance_chamber_outlet_line: AmesimPnl0001Pipe
+    p4_port3_next_resistance_chamber_inlet_orifice: AmesimPneumaticOrifice
+    p4_port3_next_resistance_chamber_outlet_orifice: AmesimPneumaticOrifice
+    p4_port3_next_resistance_chamber_spec: TestMqlPneumaticChamberSegmentSpec
     p4_port3_remote_orifice: AmesimPneumaticOrifice
     p4_port3_remote_orifice_line: AmesimPnl0003Pipe
     p4_port3_remote_orifice_node: TestMqlPneumaticNode3
@@ -303,6 +309,9 @@ class TestMqlPn3P4NodeChamberSegmentSnapshot:
     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_next_resistance_chamber_inlet_line: ThermodynamicProperties
+    p4_port3_next_resistance_chamber: ThermodynamicProperties
+    p4_port3_next_resistance_chamber_outlet_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
@@ -380,6 +389,10 @@ class TestMqlPn3P4NodeChamberSegmentSnapshot:
     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_next_resistance_chamber_inlet_boundary_to_line_flow: float
+    p4_port3_next_resistance_chamber_inlet_line_to_chamber_flow: float
+    p4_port3_next_resistance_chamber_outlet_node_to_line_flow: float
+    p4_port3_next_resistance_chamber_outlet_line_to_chamber_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
@@ -450,11 +463,14 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             *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(),
+            *self.components.p4_port3_next_resistance_chamber_inlet_line.get_state_vector(),
+            *self.components.p4_port3_next_resistance_chamber.get_state_vector(),
+            *self.components.p4_port3_next_resistance_chamber_outlet_line.get_state_vector(),
         ]
 
     def apply_state_vector(self, values: list[float]) -> None:
-        if len(values) != 90:
+        if len(values) != 96:
-            raise ValueError("PN3/P4 node chamber segment state vector requires ninety values")
+            raise ValueError("PN3/P4 node chamber segment state vector requires ninety-six 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])
@@ -493,7 +509,10 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
         self.components.p4_port3_next_chamber.set_state_vector(values[80:82])
         self.components.p4_port3_next_chamber_outlet_line.set_state_vector(values[82:84])
         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:])
+        self.components.p4_port3_next_resistance_output_line.set_state_vector(values[88:90])
+        self.components.p4_port3_next_resistance_chamber_inlet_line.set_state_vector(values[90:92])
+        self.components.p4_port3_next_resistance_chamber.set_state_vector(values[92:94])
+        self.components.p4_port3_next_resistance_chamber_outlet_line.set_state_vector(values[94:])
 
     def snapshot(
         self,
@@ -581,6 +600,15 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
         p4_port3_next_resistance_output_line = (
             self.components.p4_port3_next_resistance_output_line.properties()
         )
+        p4_port3_next_resistance_chamber_inlet_line = (
+            self.components.p4_port3_next_resistance_chamber_inlet_line.properties()
+        )
+        p4_port3_next_resistance_chamber = (
+            self.components.p4_port3_next_resistance_chamber.properties()
+        )
+        p4_port3_next_resistance_chamber_outlet_line = (
+            self.components.p4_port3_next_resistance_chamber_outlet_line.properties()
+        )
         p4_port3_remote_orifice_line_port_1 = (
             self.components.p4_port3_remote_orifice_line.properties_1()
         )
@@ -870,6 +898,32 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
         p4_port3_next_orifice_output_to_p4_flow = (
             p4_port3_next_orifice_to_output_line_flow
         )
+        p4_port3_next_resistance_chamber_inlet_boundary_to_line_flow = (
+            self.components.p4_port3_next_resistance_chamber_inlet_line.resistance_mass_flow(
+                port_1_pressure_pa=resistance_boundary.p,
+                port_1_temperature_k=resistance_boundary.T,
+            )
+        )
+        p4_port3_next_resistance_chamber_inlet_line_to_chamber_flow = (
+            self._line_to_chamber_flow(
+                line=p4_port3_next_resistance_chamber_inlet_line,
+                chamber=p4_port3_next_resistance_chamber,
+                orifice=self.components.p4_port3_next_resistance_chamber_inlet_orifice,
+            )
+        )
+        p4_port3_next_resistance_chamber_outlet_node_to_line_flow = (
+            self.components.p4_port3_next_resistance_chamber_outlet_line.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,
+            )
+        )
+        p4_port3_next_resistance_chamber_outlet_line_to_chamber_flow = (
+            self._line_to_chamber_flow(
+                line=p4_port3_next_resistance_chamber_outlet_line,
+                chamber=p4_port3_next_resistance_chamber,
+                orifice=self.components.p4_port3_next_resistance_chamber_outlet_orifice,
+            )
+        )
         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,
@@ -880,8 +934,14 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
                     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_enthalpy_flow_w=self._enthalpy_flow_from_node(
-                port_3_mass_flow_g_s=0.0,
+                    flow_kg_s=p4_port3_next_resistance_chamber_outlet_node_to_line_flow,
+                    node_h=p4_port3_next_resistance_node_line_port_1.h,
+                    connected_h=p4_port3_next_resistance_chamber_outlet_line.h,
+                ),
+                port_3_mass_flow_g_s=(
+                    p4_port3_next_resistance_chamber_outlet_node_to_line_flow * 1.0e3
+                ),
             )
         )
         p4_port3_next_resistance_node_to_line_flow = (
@@ -1218,6 +1278,13 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
                 p4_port3_next_resistance_node_line_port_2
             ),
             p4_port3_next_resistance_output_line=p4_port3_next_resistance_output_line,
+            p4_port3_next_resistance_chamber_inlet_line=(
+                p4_port3_next_resistance_chamber_inlet_line
+            ),
+            p4_port3_next_resistance_chamber=p4_port3_next_resistance_chamber,
+            p4_port3_next_resistance_chamber_outlet_line=(
+                p4_port3_next_resistance_chamber_outlet_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=(
@@ -1345,6 +1412,18 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             p4_port3_next_resistance_output_to_p4_flow=(
                 p4_port3_next_resistance_output_to_p4_flow
             ),
+            p4_port3_next_resistance_chamber_inlet_boundary_to_line_flow=(
+                p4_port3_next_resistance_chamber_inlet_boundary_to_line_flow
+            ),
+            p4_port3_next_resistance_chamber_inlet_line_to_chamber_flow=(
+                p4_port3_next_resistance_chamber_inlet_line_to_chamber_flow
+            ),
+            p4_port3_next_resistance_chamber_outlet_node_to_line_flow=(
+                p4_port3_next_resistance_chamber_outlet_node_to_line_flow
+            ),
+            p4_port3_next_resistance_chamber_outlet_line_to_chamber_flow=(
+                p4_port3_next_resistance_chamber_outlet_line_to_chamber_flow
+            ),
             p4_port3_remote_node_to_orifice_line_flow=(
                 p4_port3_remote_node_to_orifice_line_flow
             ),
@@ -1800,6 +1879,51 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
         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
 
+        resistance_chamber_spec = self.components.p4_port3_next_resistance_chamber_spec
+        p4_port3_next_resistance_chamber = self.components.p4_port3_next_resistance_chamber
+        p4_port3_next_resistance_chamber_inlet_port = self._port(
+            p4_port3_next_resistance_chamber,
+            resistance_chamber_spec.volume_inlet_port,
+        )
+        p4_port3_next_resistance_chamber_outlet_port = self._port(
+            p4_port3_next_resistance_chamber,
+            resistance_chamber_spec.volume_outlet_port,
+        )
+        TestMqlPnl0001PairChamberSegmentClosure._write_line_side(
+            self,
+            line=self.components.p4_port3_next_resistance_chamber_inlet_line,
+            line_properties=snapshot.p4_port3_next_resistance_chamber_inlet_line,
+            node_properties=snapshot.resistance_boundary,
+            node_to_line_flow=(
+                snapshot.p4_port3_next_resistance_chamber_inlet_boundary_to_line_flow
+            ),
+            line_to_chamber_flow=(
+                snapshot.p4_port3_next_resistance_chamber_inlet_line_to_chamber_flow
+            ),
+            orifice=self.components.p4_port3_next_resistance_chamber_inlet_orifice,
+            orifice_boundary_port=resistance_chamber_spec.inlet_orifice_boundary_port,
+            orifice_volume_port=resistance_chamber_spec.inlet_orifice_volume_port,
+            chamber_port=p4_port3_next_resistance_chamber_inlet_port,
+            chamber_properties=snapshot.p4_port3_next_resistance_chamber,
+        )
+        TestMqlPnl0001PairChamberSegmentClosure._write_line_side(
+            self,
+            line=self.components.p4_port3_next_resistance_chamber_outlet_line,
+            line_properties=snapshot.p4_port3_next_resistance_chamber_outlet_line,
+            node_properties=snapshot.p4_port3_next_resistance_node_line_port_1,
+            node_to_line_flow=(
+                snapshot.p4_port3_next_resistance_chamber_outlet_node_to_line_flow
+            ),
+            line_to_chamber_flow=(
+                snapshot.p4_port3_next_resistance_chamber_outlet_line_to_chamber_flow
+            ),
+            orifice=self.components.p4_port3_next_resistance_chamber_outlet_orifice,
+            orifice_boundary_port=resistance_chamber_spec.outlet_orifice_boundary_port,
+            orifice_volume_port=resistance_chamber_spec.outlet_orifice_volume_port,
+            chamber_port=p4_port3_next_resistance_chamber_outlet_port,
+            chamber_properties=snapshot.p4_port3_next_resistance_chamber,
+        )
+
         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
@@ -2184,6 +2308,49 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
                 connected_h_2=snapshot.p4_bridge_primary_line.h,
             )
         )
+        p4_port3_next_resistance_chamber_inlet_derivative = (
+            self.components.p4_port3_next_resistance_chamber_inlet_line.derivatives_from_connections(
+                port_1_m_flow=snapshot.p4_port3_next_resistance_chamber_inlet_boundary_to_line_flow,
+                connected_h_1=snapshot.resistance_boundary.h,
+                port_2_m_flow=(
+                    -snapshot.p4_port3_next_resistance_chamber_inlet_line_to_chamber_flow
+                ),
+                connected_h_2=snapshot.p4_port3_next_resistance_chamber.h,
+            )
+        )
+        p4_port3_next_resistance_chamber_spec = (
+            self.components.p4_port3_next_resistance_chamber_spec
+        )
+        p4_port3_next_resistance_chamber = (
+            self.components.p4_port3_next_resistance_chamber
+        )
+        p4_port3_next_resistance_fixed_chamber_derivative = (
+            p4_port3_next_resistance_chamber.derivatives_from_two_connections(
+                port_a_m_flow=self._port(p4_port3_next_resistance_chamber, "port_1").m_flow,
+                connected_h_a=(
+                    snapshot.p4_port3_next_resistance_chamber_inlet_line.h
+                    if p4_port3_next_resistance_chamber_spec.volume_inlet_port == "port_1"
+                    else snapshot.p4_port3_next_resistance_chamber_outlet_line.h
+                ),
+                port_b_m_flow=self._port(p4_port3_next_resistance_chamber, "port_2").m_flow,
+                connected_h_b=(
+                    snapshot.p4_port3_next_resistance_chamber_inlet_line.h
+                    if p4_port3_next_resistance_chamber_spec.volume_inlet_port == "port_2"
+                    else snapshot.p4_port3_next_resistance_chamber_outlet_line.h
+                ),
+                internal_h=snapshot.p4_port3_next_resistance_chamber.h,
+            )
+        )
+        p4_port3_next_resistance_chamber_outlet_derivative = (
+            self.components.p4_port3_next_resistance_chamber_outlet_line.derivatives_from_connections(
+                port_1_m_flow=snapshot.p4_port3_next_resistance_chamber_outlet_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_chamber_outlet_line_to_chamber_flow
+                ),
+                connected_h_2=snapshot.p4_port3_next_resistance_chamber.h,
+            )
+        )
         return [
             *inlet_derivative.as_vector(),
             *chamber_derivative.as_vector(),
@@ -2230,6 +2397,9 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             *p4_port3_next_resistance_derivative_1.as_vector(),
             *p4_port3_next_resistance_derivative_2.as_vector(),
             *p4_port3_next_resistance_output_derivative.as_vector(),
+            *p4_port3_next_resistance_chamber_inlet_derivative.as_vector(),
+            *p4_port3_next_resistance_fixed_chamber_derivative.as_vector(),
+            *p4_port3_next_resistance_chamber_outlet_derivative.as_vector(),
         ]
 
 

tests/test_test_mql_pnl0001_segment.py

@@ -436,8 +436,28 @@ class TestMqlPn3P4NodeChamberSegmentTests(unittest.TestCase):
             closure.components.p4_port3_next_resistance_output_line.name,
             "pneumatic_70",
         )
-        self.assertEqual(len(closure.initial_state_vector()), 90)
+        self.assertEqual(
-        self.assertEqual(len(rhs), 90)
+            closure.components.p4_port3_next_resistance_chamber_inlet_line.name,
+            "pneumatic_101",
+        )
+        self.assertEqual(
+            closure.components.p4_port3_next_resistance_chamber.name,
+            "pn_general_chamber_4",
+        )
+        self.assertEqual(
+            closure.components.p4_port3_next_resistance_chamber_outlet_line.name,
+            "pneumatic_102",
+        )
+        self.assertEqual(
+            closure.components.p4_port3_next_resistance_chamber_inlet_orifice.name,
+            "pn_orifice_22",
+        )
+        self.assertEqual(
+            closure.components.p4_port3_next_resistance_chamber_outlet_orifice.name,
+            "pn_orifice_23",
+        )
+        self.assertEqual(len(closure.initial_state_vector()), 96)
+        self.assertEqual(len(rhs), 96)
         self.assertAlmostEqual(
             snapshot.p4_balance.pressure_pa,
             snapshot.p4_primary_line.p,
@@ -648,6 +668,29 @@ class TestMqlPn3P4NodeChamberSegmentTests(unittest.TestCase):
                 "port_4",
             ).name,
         )
+        resistance_chamber_segment = (
+            self.system.discover_pneumatic_branch_topology().chamber_segment_specs[2]
+        )
+        self.assertEqual(
+            closure.components.p4_port3_next_resistance_chamber_spec,
+            resistance_chamber_segment,
+        )
+        self.assertEqual(
+            closure.components.p4_port3_next_resistance_chamber_inlet_line.name,
+            resistance_chamber_segment.inlet_line_alias,
+        )
+        self.assertEqual(
+            closure.components.p4_port3_next_resistance_chamber_outlet_line.name,
+            resistance_chamber_segment.outlet_line_alias,
+        )
+        self.assertEqual(
+            closure.components.p4_port3_next_resistance_chamber_inlet_orifice.name,
+            resistance_chamber_segment.inlet_orifice_alias,
+        )
+        self.assertEqual(
+            closure.components.p4_port3_next_resistance_chamber_outlet_orifice.name,
+            resistance_chamber_segment.outlet_orifice_alias,
+        )
         self.assertEqual(
             closure.components.p4_port3_remote_orifice.name,
             port3_remote_neighborhood.port_4.orifice_alias,
@@ -812,7 +855,8 @@ class TestMqlPn3P4NodeChamberSegmentTests(unittest.TestCase):
         )
         self.assertAlmostEqual(
             snapshot.p4_port3_next_resistance_node_to_line_flow
-            + snapshot.p4_port3_next_resistance_node_to_next_flow,
+            + snapshot.p4_port3_next_resistance_node_to_next_flow
+            + snapshot.p4_port3_next_resistance_chamber_outlet_node_to_line_flow,
             0.0,
             delta=1.0e-12,
         )
@@ -830,14 +874,23 @@ class TestMqlPn3P4NodeChamberSegmentTests(unittest.TestCase):
             ),
             delta=1.0e-12,
         )
-        mass_derivative_sum = sum(rhs[index] for index in range(0, 90, 2))
+        resistance_chamber_mass_sum = rhs[90] + rhs[92] + rhs[94]
+        self.assertAlmostEqual(
+            resistance_chamber_mass_sum,
+            (
+                snapshot.p4_port3_next_resistance_chamber_inlet_boundary_to_line_flow
+                + snapshot.p4_port3_next_resistance_chamber_outlet_node_to_line_flow
+            ),
+            delta=1.0e-12,
+        )
+        mass_derivative_sum = sum(rhs[index] for index in range(0, 96, 2))
         self.assertAlmostEqual(
             mass_derivative_sum,
-            0.0,
+            snapshot.p4_port3_next_resistance_chamber_inlet_boundary_to_line_flow,
             delta=1.0e-12,
         )
 
-    def test_simulates_ninety_state_pn3_p4_node_chamber_segment(self) -> None:
+    def test_simulates_ninety_six_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,
@@ -852,8 +905,8 @@ class TestMqlPn3P4NodeChamberSegmentTests(unittest.TestCase):
 
         self.assertTrue(solution.success)
         self.assertEqual(len(solution.t), 3)
-        self.assertEqual(len(solution.y), 90)
+        self.assertEqual(len(solution.y), 96)
-        self.assertEqual([len(row) for row in solution.y], [3] * 90)
+        self.assertEqual([len(row) for row in solution.y], [3] * 96)
 
 
 if __name__ == "__main__":