76 lines
2.2 KiB
Python
76 lines
2.2 KiB
Python
import numpy as np
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import pytest
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from gas_cylinder import (
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DEFAULT_FLUID,
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DEFAULT_P_INIT,
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DEFAULT_T_INIT,
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DEFAULT_VOLUME,
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HighPressureGasCylinder,
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)
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def test_default_high_pressure_cylinder_state_matches_inputs():
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cylinder = HighPressureGasCylinder()
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assert cylinder.fluid == DEFAULT_FLUID
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assert cylinder.V == DEFAULT_VOLUME
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assert abs(cylinder.P - DEFAULT_P_INIT) / DEFAULT_P_INIT < 1e-8
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assert abs(cylinder.T - DEFAULT_T_INIT) < 1e-8
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assert cylinder.mass > 0
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assert cylinder.U > 0
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assert cylinder.gamma > 1.0
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assert cylinder.compressibility_factor > 0.0
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def test_cylinder_accepts_configurable_fluid_pressure_volume_temperature():
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cylinder = HighPressureGasCylinder(
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fluid="Nitrogen",
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P_init=2.0e6,
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V=50e-3,
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T_init=300.0,
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)
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assert cylinder.fluid == "Nitrogen"
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assert abs(cylinder.P - 2.0e6) / 2.0e6 < 1e-8
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assert abs(cylinder.T - 300.0) < 1e-8
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assert abs(cylinder.V - 50e-3) < 1e-15
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assert cylinder.mass > 0
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def test_cylinder_ghost_state_is_stagnant_conservative_vector():
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cylinder = HighPressureGasCylinder()
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ghost = cylinder.ghost_state()
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assert ghost.shape == (3,)
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assert abs(ghost[0] - cylinder.rho) < 1e-12
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assert ghost[1] == 0.0
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assert abs(ghost[2] - cylinder.rho * cylinder.specific_internal_energy) < 1e-6
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def test_cylinder_apply_flux_outflow_reduces_mass_energy_and_pressure():
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cylinder = HighPressureGasCylinder()
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mass_before = cylinder.mass
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U_before = cylinder.U
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P_before = cylinder.P
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mdot = 1e-3
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edot = mdot * cylinder.h
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dt = 1.0
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cylinder.apply_flux(mdot=mdot, edot=edot, dt=dt, sign=-1)
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assert abs(cylinder.mass - (mass_before - mdot * dt)) < 1e-12
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assert abs(cylinder.U - (U_before - edot * dt)) < 1e-6
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assert cylinder.P < P_before
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def test_cylinder_rejects_invalid_inputs():
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with pytest.raises(ValueError):
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HighPressureGasCylinder(fluid="")
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with pytest.raises(ValueError):
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HighPressureGasCylinder(P_init=0.0)
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with pytest.raises(ValueError):
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HighPressureGasCylinder(V=0.0)
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with pytest.raises(ValueError):
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HighPressureGasCylinder(T_init=0.0)
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