103 lines
3.6 KiB
Python
103 lines
3.6 KiB
Python
from __future__ import annotations
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import unittest
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from PythonModels.components.amesim_pneumatic_line import AmesimPnl0001Pipe
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class AmesimPnl0001PipeTests(unittest.TestCase):
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def setUp(self) -> None:
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self.pipe = AmesimPnl0001Pipe(
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name="pneumatic_96",
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diameter_mm=14.0,
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length_m=1.0,
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relative_roughness=0.045 / 14.0,
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p0=15.3e6,
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T0=293.15,
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)
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def test_initial_state_uses_real_pipe_volume_and_two_states(self) -> None:
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properties = self.pipe.properties()
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self.assertAlmostEqual(self.pipe.volume, 1.539380400258999e-4)
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self.assertEqual(len(self.pipe.get_state_vector()), 2)
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self.assertAlmostEqual(properties.p, 15.3e6, delta=1.0e-5)
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self.assertAlmostEqual(properties.T, 293.15)
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self.assertAlmostEqual(self.pipe.gas_mass_g(), 3.716965219188, places=10)
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def test_resistance_flow_follows_pressure_gradient(self) -> None:
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forward = self.pipe.resistance_mass_flow(
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port_1_pressure_pa=15.31e6,
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port_1_temperature_k=293.15,
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)
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reverse = self.pipe.resistance_mass_flow(
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port_1_pressure_pa=15.29e6,
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port_1_temperature_k=293.15,
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)
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self.assertGreater(forward, 0.0)
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self.assertLess(reverse, 0.0)
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self.assertAlmostEqual(abs(forward), abs(reverse), delta=abs(forward) * 0.01)
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def test_calibrated_linear_conductance_overrides_darcy_flow(self) -> None:
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pipe = AmesimPnl0001Pipe(
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name="linear",
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diameter_mm=20.0,
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length_m=1.0,
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relative_roughness=0.045 / 20.0,
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calibrated_linear_conductance=5.5636e-6,
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p0=200000.0,
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T0=293.15,
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)
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flow = pipe.resistance_mass_flow(
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port_1_pressure_pa=180000.0,
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port_1_temperature_k=293.15,
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)
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self.assertAlmostEqual(
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flow,
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5.5636e-6 * (180000.0 - 200000.0) / (293.15 ** 0.5),
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)
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def test_diagnostics_reproduce_laminar_friction_contract(self) -> None:
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diagnostics = self.pipe.diagnostics(mass_flow_kg_s=8.90603914774626e-6)
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self.assertGreater(diagnostics.reynolds_number, 40.0)
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self.assertLess(diagnostics.reynolds_number, 45.0)
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self.assertAlmostEqual(
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diagnostics.friction_factor,
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64.0 / diagnostics.reynolds_number,
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)
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self.assertGreater(diagnostics.gas_velocity_m_s, 0.0)
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self.assertGreater(diagnostics.pressure_drop_pa, 0.0)
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def test_darcy_pressure_drop_for_state_uses_supplied_density_state(self) -> None:
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diagnostics = self.pipe.diagnostics(mass_flow_kg_s=8.90603914774626e-6)
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pressure_drop = self.pipe.darcy_pressure_drop_for_state(
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mass_flow_kg_s=8.90603914774626e-6,
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pressure_pa=self.pipe.properties().p,
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temperature_k=self.pipe.properties().T,
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)
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self.assertAlmostEqual(pressure_drop, diagnostics.pressure_drop_pa)
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def test_connection_derivative_preserves_mass_and_stream_direction(self) -> None:
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internal = self.pipe.properties()
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derivative = self.pipe.derivatives_from_connections(
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port_1_m_flow=0.2,
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connected_h_1=internal.h + 1000.0,
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port_2_m_flow=-0.1,
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connected_h_2=internal.h - 1000.0,
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)
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self.assertAlmostEqual(derivative.m, 0.1)
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self.assertAlmostEqual(
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derivative.U,
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0.2 * (internal.h + 1000.0) / self.pipe.gas.gamma
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- 0.1 * internal.u,
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)
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if __name__ == "__main__":
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unittest.main()
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