def posvel_from_orbital_elements(Mstar, semimajor_axis, eccentricity, kepler, rng = None):
if rng is None:
rng = random
mean_anomaly = rng.uniform(0, 2*numpy.pi, 1)
kepler.initialize_from_elements(
Mstar,
semimajor_axis,
eccentricity,
mean_anomaly=mean_anomaly)
position = quantities.as_vector_quantity(kepler.get_separation_vector())
velocity = quantities.as_vector_quantity(kepler.get_velocity_vector())
return position, velocity
def new_distribution(x0, x1, surface_density_factor=1.0, mstar=1 | units.MSun):
x = x0
masses = []
positions = []
while x < x1:
mass, orbital_separation = get_mass_and_orbital_separation(
x, surface_density_factor=surface_density_factor, mstar=mstar)
masses.append(mass)
positions.append(x)
x += orbital_separation
return (quantities.as_vector_quantity(masses),
quantities.as_vector_quantity(positions))
def new_distribution(x0, x1, surface_density_factor = 1.0, mstar = 1 | units.MSun):
x = x0
masses = []
positions = []
while x < x1:
mass, orbital_separation = get_mass_and_orbital_separation(x, surface_density_factor = surface_density_factor, mstar = mstar)
masses.append(mass)
positions.append(x)
x += orbital_separation
return (
quantities.as_vector_quantity(masses),
quantities.as_vector_quantity(positions)
)
def posvel_from_orbital_elements(Mstar,
semimajor_axis,
eccentricity,
kepler,
rng=None):
if rng is None:
rng = random
mean_anomaly = rng.uniform(0, 2 * numpy.pi, 1)
kepler.initialize_from_elements(Mstar,
semimajor_axis,
eccentricity,
mean_anomaly=mean_anomaly)
position = quantities.as_vector_quantity(kepler.get_separation_vector())
velocity = quantities.as_vector_quantity(kepler.get_velocity_vector())
return position, velocity
def xtest_acceleration(self):
""" Test the wind acceleration """
star = self.create_star()
star.position = [1, 1, 1] | units.RSun
star_wind = stellar_wind.new_stellar_wind(
3e-11|units.MSun,
mode="accelerate",
init_v_wind_ratio = 0.01,
r_min_ratio=1.5,
r_max_ratio=5
)
star_wind.particles.add_particles(star)
# unaffected points
points = [[1,1,1], [1,1,0], [1,4,1], [12,1,1]]|units.RSun
x, y, z = points.transpose()
ax, ay, az = star_wind.get_gravity_at_point(1, x, y, z)
zeros = [0,0,0,0]|units.m/units.s**2
self.assertEqual(ax, zeros)
self.assertEqual(ay, zeros)
self.assertEqual(az, zeros)
# affected points
points = [[5.1,1,1], [1,1,5.1], [1,7,1], [1,7,8], [-8,1,1]]|units.RSun
x, y, z = points.transpose()
ax, ay, az = star_wind.get_gravity_at_point(1, x, y, z)
a = quantities.as_vector_quantity([ax, ay, az]).transpose()
self.assertAlmostEquals(a[0], [32.64354, 0, 0]|units.m/units.s**2, places=4)
self.assertAlmostEquals(a[1], [0, 0, 32.64354]|units.m/units.s**2, places=4)
self.assertAlmostEquals(a[2], [0, 15.24272, 0]|units.m/units.s**2, places=4)
self.assertAlmostEquals(a[3], [0, 4.20134, 4.90156]|units.m/units.s**2, places=4)
self.assertAlmostEquals(a[4], [-6.77454, 0, 0]|units.m/units.s**2, places=4)
def test_get_gravity_at_point(self):
star = self.create_star()
star.position = [1, 1, 1] | units.RSun
star_wind = stellar_wind.new_stellar_wind(
3e-11 | units.MSun,
mode="accelerate",
acceleration_function="rsquared",
compensate_gravity=False,
compensate_pressure=False,
)
star_wind.particles.add_particles(star)
# unaffected points
points = [[1, 1, -10], [1, 12, 0], [1, -10, 1],
[12, 0, 1]] | units.RSun
x, y, z = points.transpose()
ax, ay, az = star_wind.get_gravity_at_point(1, x, y, z)
zeros = [0, 0, 0, 0] | units.m/units.s**2
self.assertEqual(ax, zeros)
self.assertEqual(ay, zeros)
self.assertEqual(az, zeros)
# affected points
points = [[5.1, 1, 1], [1, 1, 5.1], [1, 7, 1], [1, 7, 8],
[-8, 1, 1]] | units.RSun
x, y, z = points.transpose()
ax, ay, az = star_wind.get_gravity_at_point(1, x, y, z)
result = quantities.as_vector_quantity([ax, ay, az]).transpose()
expected = [[2.64618600667e-05, 0.0, 0.0],
[0.0, 0.0, 2.64618600667e-05],
[0.0, 1.23562185478e-05, 0.0],
[0.0, 3.40573571553e-06, 3.97335833479e-06],
[-5.49165268791e-06, 0.0, 0.0]] | units.m / units.s**2
self.assertAlmostEquals(result, expected)
def update_dynamical_binaries_from_stellar(stellar, multiples_code, converter):
kep = new_kepler(converter)
# kep.set_longitudinal_unit_vector(1.0,0.0, 0.0)
# kep.set_transverse_unit_vector(0.0, 1.0, 0)
# THIS NEEDS TO BE CHECKED
print "++++++++++++ THIS NEEDS TO BE CHECKED ++++++++++++++++++++"
print "Number of binaries=", len(stellar.binaries)
for bi in stellar.binaries:
bs = bi.as_particle_in_set(multiples_code.binaries)
total_mass = bi.child1.mass + bi.child2.mass
kep.initialize_from_elements(total_mass, bi.semi_major_axis,
bi.eccentricity)
rel_position = as_vector_quantity(kep.get_separation_vector())
rel_velocity = as_vector_quantity(kep.get_velocity_vector())
mu = bi.child1.mass / total_mass
bs.child1.position = mu * rel_position
bs.child2.position = -(1 - mu) * rel_position
bs.child1.velocity = mu * rel_velocity
bs.child2.velocity = -(1 - mu) * rel_velocity
print "semi_major_axis=", bi.semi_major_axis, total_mass, bi.child1.mass, bi.child2.mass, bi.eccentricity
kep.stop()
def get_gravity_at_point(self, eps, x, y, z):
total_acceleration = numpy.zeros(shape=(len(x), 3))|units.m/units.s**2
positions = quantities.as_vector_quantity(numpy.transpose([x, y, z]))
for star in self.particles:
relative_position = positions - star.position
distance = relative_position.lengths()
acceleration = self.wind_accelation_formula(star, distance)
direction = relative_position / as_three_vector(distance)
# Correct for directionless vectors with length 0
direction[numpy.isnan(direction)] = 0
total_acceleration += direction * as_three_vector(acceleration)
return total_acceleration.transpose()
def cellsize(grid):
"""Returns the lenght of each direction in the grid.
Works for regular and cartesian grids.
"""
result = []
Ndim = len(grid.shape)
cell1 = grid[(0, ) * Ndim]
for i in range(
len(grid[grid.get_minimum_index()].position)
): # shape of position not necessarily same as shape of the grid?
if grid.shape[i] > 1:
cell2 = grid[(0, ) * i + (1, ) + (0, ) * (Ndim - 1 - i)]
result.append((cell2.position - cell1.position)[i])
return as_vector_quantity(result)
def get_gravity_at_point(self, eps, x, y, z):
total_acceleration = (numpy.zeros(shape=(len(x), 3))
| units.m / units.s**2)
positions = quantities.as_vector_quantity(numpy.transpose([x, y, z]))
for star in self.particles:
relative_position = positions - star.position
distance = relative_position.lengths()
acceleration = self.acceleration(star, distance)
direction = relative_position / self.as_three_vector(distance)
# Correct for directionless vectors with length 0
direction[numpy.isnan(direction)] = 0
total_acceleration += direction * self.as_three_vector(
acceleration)
return total_acceleration.transpose()
def get_gravity_at_point(self, eps, x, y, z):
total_acceleration = (
numpy.zeros(shape=(len(x), 3)) | units.m/units.s**2)
positions = quantities.as_vector_quantity([x, y, z]).transpose()
for star in self.particles:
relative_position = positions - star.position
distance = relative_position.lengths()
acceleration = self.acceleration(star, distance)
direction = relative_position / self.as_three_vector(distance)
direction = numpy.nan_to_num(direction)
acc_vector = self.as_three_vector(acceleration)
total_acceleration += direction * acc_vector
return total_acceleration.transpose()
def test_get_gravity_at_point(self):
star = self.create_star()
star.position = [1, 1, 1] | units.RSun
star_wind = stellar_wind.new_stellar_wind(
3e-11 | units.MSun,
mode="accelerate",
acceleration_function="rsquared",
compensate_gravity=False,
compensate_pressure=False,
r_out_ratio=5,
)
star_wind.particles.add_particles(star)
# unaffected points
points = [[1, 1, -10], [1, 12, 0], [1, -10, 1], [12, 0, 1]
] | units.RSun
x, y, z = points.transpose()
ax, ay, az = star_wind.get_gravity_at_point(1, x, y, z)
zeros = [0, 0, 0, 0] | units.m / units.s**2
self.assertEqual(ax, zeros)
self.assertEqual(ay, zeros)
self.assertEqual(az, zeros)
# affected points
points = [[5.1, 1, 1], [1, 1, 5.1], [1, 7, 1], [1, 7, 8], [-8, 1, 1]
] | units.RSun
x, y, z = points.transpose()
ax, ay, az = star_wind.get_gravity_at_point(1, x, y, z)
result = quantities.as_vector_quantity([ax, ay, az]).transpose()
expected = [[2.64618600667e-05, 0.0, 0.0], [
0.0, 0.0, 2.64618600667e-05
], [0.0, 1.23562185478e-05, 0.0],
[0.0, 3.40573571553e-06, 3.97335833479e-06],
[-5.49165268791e-06, 0.0, 0.0]] | units.m / units.s**2
self.assertAlmostEquals(result, expected)
def __init__(self, radius, height, **kwargs):
dimensions = quantities.as_vector_quantity([radius, radius, height])
Spheroid.__init__(self, dimensions, **kwargs)
def __init__(self, radius, height, **kwargs):
dimensions = quantities.as_vector_quantity([radius, radius, height])
Spheroid.__init__(self, dimensions, **kwargs)