257 lines
8.7 KiB
Python
257 lines
8.7 KiB
Python
from __future__ import annotations
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import unittest
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from app.simulation.components.amesim.flow.orifices import AmesimPnvo001FixedOpening
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from app.simulation.components.amesim.media.mediums import (
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AmesimHeliumPengRobinsonMedium,
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)
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from app.simulation.core.medium import IdealGasMedium
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from app.simulation.registry import COMPONENT_MODEL_REGISTRY
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class AmesimPnvo001FixedOpeningComponentTests(unittest.TestCase):
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def setUp(self) -> None:
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self.medium = IdealGasMedium()
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def test_default_create_preserves_fixed_opening_contract(self) -> None:
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valve = COMPONENT_MODEL_REGISTRY["amesim_pnvo001_fixed"].create(
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"valve_1",
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self.medium,
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{},
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)
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self.assertIsInstance(valve, AmesimPnvo001FixedOpening)
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self.assertEqual(set(valve.ports), {"port_2", "port_3"})
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self.assertEqual(
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set(valve.parameter_values),
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{"cq", "area0", "Cv", "Kv", "gi", "flowset", "opening"},
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)
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self.assertEqual(valve.opening, 1.0)
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def test_rejects_fractional_flowset(self) -> None:
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with self.assertRaisesRegex(ValueError, "must be one of"):
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COMPONENT_MODEL_REGISTRY["amesim_pnvo001_fixed"].create(
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"valve_1",
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self.medium,
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{"flowset": 1.5},
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)
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def test_opening_scales_effective_area(self) -> None:
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valve = AmesimPnvo001FixedOpening(
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"valve_1",
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self.medium,
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area0=2.0e-6,
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opening=0.25,
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)
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self.assertAlmostEqual(valve.maximum_area, 2.0e-6)
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self.assertAlmostEqual(valve.effective_area, 0.5e-6)
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self.assertEqual(valve.component_result_values()["xv"], 0.25)
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def test_zero_opening_blocks_flow(self) -> None:
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valve = AmesimPnvo001FixedOpening("valve_1", self.medium, opening=0.0)
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self.assertEqual(valve.mass_flow(500000.0, 100000.0), 0.0)
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def test_mass_flow_is_bidirectional_by_pressure_order(self) -> None:
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valve = AmesimPnvo001FixedOpening("valve_1", self.medium, opening=0.5)
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forward = valve.mass_flow(500000.0, 100000.0)
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reverse = valve.mass_flow(100000.0, 500000.0)
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self.assertGreater(forward, 0.0)
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self.assertLess(reverse, 0.0)
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self.assertAlmostEqual(forward, -reverse)
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def test_mass_flow_is_continuous_across_former_relative_deadband(self) -> None:
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valve = AmesimPnvo001FixedOpening("valve_1", self.medium, opening=0.5)
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base_pressure = 8.0e6
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former_threshold = base_pressure * 1.0e-7
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below = valve.mass_flow(base_pressure + 0.99 * former_threshold, base_pressure)
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above = valve.mass_flow(base_pressure + 1.01 * former_threshold, base_pressure)
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reverse = valve.mass_flow(base_pressure, base_pressure + 0.99 * former_threshold)
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self.assertGreater(below, 0.0)
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self.assertGreater(above, below)
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self.assertLess(reverse, 0.0)
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self.assertAlmostEqual(below, -reverse, delta=abs(below) * 1.0e-9)
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self.assertLess(abs(above - below), abs(above) * 0.05)
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self.assertEqual(valve.mass_flow(base_pressure, base_pressure), 0.0)
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self.assertGreater(valve.mass_flow(15.3e6 + 0.1, 15.3e6), 0.0)
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def test_mass_flow_uses_connected_enthalpy_from_the_upstream_side(self) -> None:
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valve = AmesimPnvo001FixedOpening("valve_1", self.medium, opening=0.5)
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hot_h = self.medium.specific_enthalpy(600.0)
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cold_h = self.medium.specific_enthalpy(200.0)
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valve.update_stream_outflows({"port_2": hot_h, "port_3": cold_h})
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self.assertEqual(valve.port_2.h_outflow, cold_h)
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self.assertEqual(valve.port_3.h_outflow, hot_h)
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self.assertAlmostEqual(
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valve.mass_flow(500000.0, 100000.0),
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valve._one_way_mass_flow(
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upstream_pressure=500000.0,
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downstream_pressure=100000.0,
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upstream_temperature=600.0,
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),
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)
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self.assertAlmostEqual(
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valve.mass_flow(100000.0, 500000.0),
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-valve._one_way_mass_flow(
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upstream_pressure=500000.0,
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downstream_pressure=100000.0,
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upstream_temperature=200.0,
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),
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)
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def test_helium_flow_uses_pressure_enthalpy_and_real_gas_factor(self) -> None:
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medium = AmesimHeliumPengRobinsonMedium()
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valve = AmesimPnvo001FixedOpening(
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"valve_1",
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medium,
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cq=0.45,
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area0=78.5e-6,
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opening=1.0,
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)
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upstream_pressure = 15_201_996.778497815
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downstream_pressure = 405_072.8123335606
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upstream_temperature = 292.3997890954483
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valve.port_2.p = upstream_pressure
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valve.port_3.p = downstream_pressure
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upstream_enthalpy = medium.specific_enthalpy_at_pressure(
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upstream_pressure,
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upstream_temperature,
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)
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valve.update_stream_outflows(
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{
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"port_2": upstream_enthalpy,
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"port_3": medium.specific_enthalpy_at_pressure(
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downstream_pressure,
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393.46713105173205,
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),
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}
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)
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self.assertLess(upstream_enthalpy, 0.0)
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self.assertAlmostEqual(
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valve._upstream_temperature("port_2"),
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upstream_temperature,
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delta=1.0e-8,
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)
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self.assertAlmostEqual(
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valve.mass_flow(upstream_pressure, downstream_pressure),
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0.49551308906777447,
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delta=1.0e-9,
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)
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results = valve.component_result_values()
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self.assertAlmostEqual(
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results["cm"],
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0.015778323343746598,
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delta=1.0e-11,
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)
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self.assertAlmostEqual(
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results["gasvel"],
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894.7011595213406,
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delta=1.0e-8,
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)
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def test_helium_laminar_transition_matches_amesim_baseline(self) -> None:
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medium = AmesimHeliumPengRobinsonMedium()
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valve = AmesimPnvo001FixedOpening(
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"valve_1",
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medium,
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cq=0.45,
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area0=78.5e-6,
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opening=1.0,
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)
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cases = (
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# p_up [PaA], p_down [PaA], T_up [K], dm [g/s], Cm, velocity [m/s]
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(
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10_837_357.913884956,
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10_835_428.362241976,
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255.45507181057303,
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9.770711291393273,
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4.07922685863417e-4,
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13.951480313568323,
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),
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(
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10_735_827.842429036,
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10_735_543.135671863,
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254.49635939397584,
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3.4711877823059916,
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1.4601624857015259e-4,
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4.982778680076626,
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),
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(
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10_703_773.135050302,
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10_703_621.857082237,
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254.1925398502598,
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1.53560321377487,
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6.475023461883112e-5,
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2.208065833961227,
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),
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(
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10_682_359.261700785,
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10_682_301.022976216,
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253.98926908210996,
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0.25626141624058846,
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1.0822847918204546e-5,
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0.36890236539556787,
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),
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(
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10_678_100.351449525,
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10_678_093.704329137,
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253.94881208705195,
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0.0033658306146710985,
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1.421965896377586e-7,
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0.004846389527047451,
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),
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)
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for (
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p_up,
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p_down,
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T_up,
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expected_dm,
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expected_cm,
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expected_velocity,
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) in cases:
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with self.subTest(pressure_difference=p_up - p_down):
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mass_flow_parameter, gas_velocity = (
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valve._one_way_flow_characteristics(
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upstream_pressure=p_up,
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downstream_pressure=p_down,
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upstream_temperature=T_up,
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)
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)
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mass_flow_g_s = (
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valve._one_way_mass_flow(
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upstream_pressure=p_up,
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downstream_pressure=p_down,
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upstream_temperature=T_up,
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)
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* 1.0e3
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)
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self.assertAlmostEqual(mass_flow_g_s, expected_dm, delta=1.0e-11)
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self.assertAlmostEqual(
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mass_flow_parameter,
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expected_cm,
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delta=1.0e-15,
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)
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self.assertAlmostEqual(
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gas_velocity,
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expected_velocity,
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delta=5.0e-10,
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)
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if __name__ == "__main__":
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unittest.main()
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