def test_coe_shift_ballast_viscous():
r"""Test position change of centre of effort."""
force = ballast_viscous(boatspeed=1.,
heel_angle=30.,
coe=(0.5, 0., -0.2),
bulb_length=0.37,
bulb_diameter=0.037,
bulb_wetted_area=0.02)
assert -0.1 - 1e-6 <= force.py <= -0.1 + 1e-6
force = ballast_viscous(boatspeed=1.,
heel_angle=-30.,
coe=(0.5, 0., -0.2),
bulb_length=0.37,
bulb_diameter=0.037,
bulb_wetted_area=0.02)
assert 0.1 - 1e-6 <= force.py <= 0.1 + 1e-6
force = ballast_viscous(boatspeed=1.,
heel_angle=60.,
coe=(0.5, 0., -0.2),
bulb_length=0.37,
bulb_diameter=0.037,
bulb_wetted_area=0.02)
assert -0.1 - 1e-6 <= force.pz <= -0.1 + 1e-6
force = ballast_viscous(boatspeed=1.,
heel_angle=-60.,
coe=(0.5, 0., -0.2),
bulb_length=0.37,
bulb_diameter=0.037,
bulb_wetted_area=0.02)
assert -0.1 - 1e-6 <= force.pz <= -0.1 + 1e-6
def test_zero_wetted_area_ballast_viscous():
r"""Zero wetted area."""
with pytest.raises(ValueError):
ballast_viscous(boatspeed=1.,
heel_angle=0.,
coe=(0.5, 0., -0.2),
bulb_length=0.37,
bulb_diameter=0.037,
bulb_wetted_area=0.)
def test_diameter_too_big_ballast_viscous():
r"""Diameter too big."""
with pytest.raises(ValueError):
ballast_viscous(boatspeed=1.,
heel_angle=0.,
coe=(0.5, 0., -0.2),
bulb_length=0.37,
bulb_diameter=0.2,
bulb_wetted_area=0.02)
def test_negative_length_ballast_viscous():
r"""Negative length."""
with pytest.raises(ValueError):
ballast_viscous(boatspeed=1.,
heel_angle=0.,
coe=(0.5, 0., -0.2),
bulb_length=-0.37,
bulb_diameter=0.037,
bulb_wetted_area=0.02)
def test_negative_transition_rn_ballast_viscous():
r"""Negative transition reynolds."""
with pytest.raises(ValueError):
ballast_viscous(boatspeed=1.,
heel_angle=0.,
coe=(0.5, 0., -0.2),
bulb_length=0.37,
bulb_diameter=0.037,
bulb_wetted_area=0.02,
transition_reynolds_number=-100.)
def test_wrong_friction_line_ballast_viscous():
r"""Friction line not a good value."""
with pytest.raises(ValueError):
ballast_viscous(boatspeed=1.,
heel_angle=0.,
coe=(0.5, 0., -0.2),
bulb_length=0.37,
bulb_diameter=0.037,
bulb_wetted_area=0.02,
turbulent_friction_line=
test_zero_kinematic_viscosity_ballast_viscous)
def test_resistance_sign_and_symmetry_ballast_viscous():
r"""Test sign and symmetry."""
force = ballast_viscous(boatspeed=1.,
heel_angle=30.,
coe=(0.5, 0., -0.2),
bulb_length=0.37,
bulb_diameter=0.037,
bulb_wetted_area=0.02)
force1 = ballast_viscous(boatspeed=-1.,
heel_angle=30.,
coe=(0.5, 0., -0.2),
bulb_length=0.37,
bulb_diameter=0.037,
bulb_wetted_area=0.02)
assert force.fx == -force1.fx
assert force.fx < 0
def test_wrong_rho_water_ballast_viscous():
r"""Rho water outside acceptable range."""
with pytest.raises(ValueError):
ballast_viscous(boatspeed=1.,
heel_angle=0.,
coe=(0.5, 0., -0.2),
bulb_length=0.37,
bulb_diameter=0.037,
bulb_wetted_area=0.02,
rho_water=900)
with pytest.raises(ValueError):
ballast_viscous(boatspeed=1.,
heel_angle=0.,
coe=(0.5, 0., -0.2),
bulb_length=0.37,
bulb_diameter=0.037,
bulb_wetted_area=0.02,
rho_water=1100)
def test_known_value_ballast_viscous():
r"""Tests with different transition Reynolds."""
bvra_2e5 = ballast_viscous(boatspeed=1.,
heel_angle=0.,
coe=(0.5, 0., -0.2),
bulb_length=0.37,
bulb_diameter=0.037,
bulb_wetted_area=0.02,
transition_reynolds_number=2e5)
assert abs(bvra_2e5.fx) > abs(bvra.fx)
average_chord=0.08,
thickness_to_chord=0.06,
wetted_area=2 * 0.02)
force1 = appendage_viscous(boatspeed=-1.,
heel_angle=30.,
coe=(0.5, 0., -0.2),
average_chord=0.08,
thickness_to_chord=0.06,
wetted_area=2 * 0.02)
assert force.fx == -force1.fx
assert force.fx < 0
bvra = ballast_viscous(boatspeed=1.,
heel_angle=0.,
coe=(0.5, 0., -0.2),
bulb_length=0.37,
bulb_diameter=0.037,
bulb_wetted_area=0.02)
def test_known_value_ballast_viscous():
r"""Tests with different transition Reynolds."""
bvra_2e5 = ballast_viscous(boatspeed=1.,
heel_angle=0.,
coe=(0.5, 0., -0.2),
bulb_length=0.37,
bulb_diameter=0.037,
bulb_wetted_area=0.02,
transition_reynolds_number=2e5)
assert abs(bvra_2e5.fx) > abs(bvra.fx)