def continue_evolution(sph_code, dynamics_code, t_end, n_steps,
relaxed_giant_output_base_name, do_energy_evolution_plot):
print("Loading snapshots...", end=' ')
files = os.listdir("snapshots")
files.sort()
files = files[-4:]
print(files)
binary = read_set_from_file(os.path.join("snapshots", files[0]), format='amuse')
gd_particles = read_set_from_file(os.path.join("snapshots", files[1]), format='amuse')
sph_particles = read_set_from_file(os.path.join("snapshots", files[2]), format='amuse')
snapshotfile = os.path.join("..", "giant_models", relaxed_giant_output_base_name + "_core.amuse")
core_particle = read_set_from_file(snapshotfile, format='amuse')
giant_model = StellarModelInSPH(
gas_particles = sph_particles,
core_particle = gd_particles[0],
core_radius = core_particle.radius)
view_on_giant = Particle()
view_on_giant.position = [0]*3 | units.m
view_on_giant.velocity = [0]*3 | units.m / units.s
print("\nSetting up {0} to simulate inner binary system".format(dynamics_code.__name__))
binary_system = prepare_binary_system(dynamics_code, binary)
print("\nSetting up {0} to simulate giant in SPH".format(sph_code.__name__))
giant_system = prepare_giant_system(sph_code, giant_model, view_on_giant, t_end, n_steps)
print("\nEvolving with bridge between", sph_code.__name__, "and", dynamics_code.__name__)
evolve_coupled_system(binary_system, giant_system, t_end, n_steps, do_energy_evolution_plot,
previous_data = os.path.join("snapshots", files[3]))
print("Done")
def test_kepler(N=10000, tend=1.| units.yr,method=0):
numpy.random.seed(12345)
conv=nbody_system.nbody_to_si(2.| units.MSun, 5.|units.AU)
comets=new_plummer_model(N,conv)
sun=Particle(mass=1.|units.MSun)
sun.position=[0,0,0]|units.AU
sun.velocity=[0,0,0]|units.kms
comets.mass*=0.
code=Kepler(conv,redirection="none")
code.set_method(method)
code.central_particle.add_particle(sun)
code.orbiters.add_particles(comets)
a0,eps0=elements(sun.mass,code.orbiters.x,code.orbiters.y,code.orbiters.z,
code.orbiters.vx,code.orbiters.vy,code.orbiters.vz)
# print code.orbiters.x[0]
print orbital_elements_from_binary(code.particles[0:2],constants.G)
t1=time.time()
code.evolve_model(tend)
t2=time.time()
print orbital_elements_from_binary(code.particles[0:2],constants.G)
# print code.orbiters.x[0]
a,eps=elements(sun.mass,code.orbiters.x,code.orbiters.y,code.orbiters.z,
code.orbiters.vx,code.orbiters.vy,code.orbiters.vz)
da=abs((a-a0)/a0)
deps=abs(eps-eps0)/eps0
dev=numpy.where(da > 0.00001)[0]
print len(dev)
print a0[dev].value_in(units.AU)
print eps0[dev]
# pyplot.plot(a0[dev].value_in(units.AU),eps0[dev],"ro")
# pyplot.plot(a[dev].value_in(units.AU),eps[dev],"g+")
print "max da,deps:",da.max(), deps.max()
print "time:",t2-t1
# pyplot.show()
return t2-t1,da.max(),deps.max()
def test4(self):
instance=SPHRay()
instance.gas_particles.add_particle(
Particle(
mass = 1 | (10**10*units.MSun),
x = 2 | units.kpc,
y = 3 | units.kpc,
z = 4 | units.kpc,
h_smooth = 0.1 | (units.kpc),
rho = 0.5 | ((10**10*units.MSun) /(units.kpc)**3),
xion = 0.01,
u = 0.2 | (10**5 * units.cm/units.s)**2
)
)
instance.src_particles.add_particle(
Particle(
luminosity = 1 | 1e48 * units.s**-1,
x = 2 | units.m,
y = 3 | units.m,
z = 4 | units.m,
SpcType = 12.3
)
)
instance.commit_particles()
self.assertAlmostRelativeEquals(instance.src_particles.luminosity, 1 | 1e48 * units.s**-1, 6)
self.assertAlmostRelativeEquals(instance.src_particles.x, 2 | units.m,7)
self.assertAlmostRelativeEquals(instance.src_particles.y, 3 | units.m,7)
self.assertAlmostRelativeEquals(instance.src_particles.z, 4 | units.m,7)
self.assertAlmostRelativeEquals(instance.src_particles.SpcType, 12.3,7)
print instance.src_particles
instance.stop()
def new_single_star(mass, pos, vel):
single_star = Particle()
single_star.mass = mass
single_star.position = pos
single_star.velocity = vel
single_star.radius = 1.0 | units.RSun
return single_star
def result(self):
if self.pickle_file is None:
self.retrieve_stellar_structure()
else:
self.unpickle_stellar_structure()
if self.with_core_particle:
self.setup_core_parameters()
sph_particles = self.convert_to_SPH()
if self.do_relax:
for result_string in self.relax(sph_particles):
print result_string
specific_internal_energy, composition, mu = self.interpolate_internal_energy(
sph_particles.position.lengths(),
do_composition_too = self.do_store_composition
)
sph_particles.u = specific_internal_energy
if self.do_store_composition:
sph_particles.add_vector_attribute("composition", self.species_names)
sph_particles.composition = composition
sph_particles.mu = mu
if self.with_core_particle and self.core_radius:
core_particle = Particle()
core_particle.mass = self.core_mass
core_particle.position = [0.0, 0.0, 0.0] | units.m
core_particle.velocity = [0.0, 0.0, 0.0] | units.m / units.s
core_particle.radius = self.core_radius
return StellarModelInSPH(gas_particles=sph_particles, core_particle=core_particle, core_radius=self.core_radius)
return StellarModelInSPH(gas_particles=sph_particles, core_particle=None, core_radius=None)
def test11(self):
print "Test that a source is not included when calculating gravity on itself."
number_of_sources = 100
mass, length, G = nbody_system.mass, nbody_system.length, nbody_system.G
sources = Particles(mass=numpy.ones(number_of_sources)|mass, x=0|length, y=0|length, z=0|length)
point = Particle(x=0|length, y=0|length, z=1.0|length)
instance = self.new_fastkick_instance()
instance.particles.add_particles(sources)
potential = instance.get_potential_at_point(0|length, point.x, point.y, point.z)
ax, ay, az = instance.get_gravity_at_point(0|length, point.x, point.y, point.z)
self.assertAlmostEqual(ax, G * (0 | mass/length**2), 5)
self.assertAlmostEqual(ay, G * (0 | mass/length**2), 5)
self.assertAlmostRelativeEqual(az, -G*sources.total_mass()/point.z**2, 3)
self.assertAlmostRelativeEqual(potential, -G*sources.total_mass()/point.z, 3)
point.mass = 1e6 | mass
instance.particles.add_particle(point)
potential = instance.get_potential_at_point(0|length, point.x, point.y, point.z)
ax, ay, az = instance.get_gravity_at_point(0|length, point.x, point.y, point.z)
self.assertAlmostEqual(ax, G * (0 | mass/length**2), 5)
self.assertAlmostEqual(ay, G * (0 | mass/length**2), 5)
self.assertAlmostRelativeEqual(az, -G*sources.total_mass()/point.z**2, 3)
self.assertAlmostRelativeEqual(potential, -G*sources.total_mass()/point.z, 3)
instance.stop()
def continue_evolution(sph_code, dynamics_code, t_end, n_steps,
relaxed_giant_output_base_name, do_energy_evolution_plot):
print "Loading snapshots...",
files = os.listdir("snapshots")
files.sort()
files = files[-4:]
print files
binary = read_set_from_file(os.path.join("snapshots", files[0]), format='amuse')
gd_particles = read_set_from_file(os.path.join("snapshots", files[1]), format='amuse')
sph_particles = read_set_from_file(os.path.join("snapshots", files[2]), format='amuse')
snapshotfile = os.path.join("..", "giant_models", relaxed_giant_output_base_name + "_core.amuse")
core_particle = read_set_from_file(snapshotfile, format='amuse')
giant_model = StellarModelInSPH(
gas_particles = sph_particles,
core_particle = gd_particles[0],
core_radius = core_particle.radius)
view_on_giant = Particle()
view_on_giant.position = [0]*3 | units.m
view_on_giant.velocity = [0]*3 | units.m / units.s
print "\nSetting up {0} to simulate inner binary system".format(dynamics_code.__name__)
binary_system = prepare_binary_system(dynamics_code, binary)
print "\nSetting up {0} to simulate giant in SPH".format(sph_code.__name__)
giant_system = prepare_giant_system(sph_code, giant_model, view_on_giant, t_end, n_steps)
print "\nEvolving with bridge between", sph_code.__name__, "and", dynamics_code.__name__
evolve_coupled_system(binary_system, giant_system, t_end, n_steps, do_energy_evolution_plot,
previous_data = os.path.join("snapshots", files[3]))
print "Done"
def handle_collision(self, primary, secondary, stellar_evolution_code=None, gravity_code=None):
primary = self.add_particle_with_internal_structure(primary, stellar_evolution_code=stellar_evolution_code)
secondary = self.add_particle_with_internal_structure(secondary, stellar_evolution_code=stellar_evolution_code)
merge_product = Particle(
key = self.key_for_merge_product(primary, secondary),
primary = primary,
secondary = secondary
)
return self.merge_products.add_particles(merge_product.as_set())
def new_particle_from_model(self,
internal_structure,
current_age,
key=None):
tmp_star = Particle(key=key)
tmp_star.mass = internal_structure["mass"]
tmp_star.radius = internal_structure["radius"]
tmp_star.type = "new particle from model"
return self.particles.add_particle(tmp_star)
def main():
temperatures_original = [] | units.K
luminosities_original = [] | units.LSun
temperatures_helium = [] | units.K
luminosities_helium = [] | units.LSun
star = Particle()
star.mass = 12.0 | units.MSun
stop_radius = 100 | units.RSun
stellar_evolution = MESA()
se_star = stellar_evolution.particles.add_particle(star)
print("Evolving a", star.mass, "star with",
stellar_evolution.__class__.__name__, end=' ')
print("until its radius exceeds", stop_radius)
while (se_star.radius < stop_radius):
se_star.evolve_one_step()
temperatures_original.append(se_star.temperature)
luminosities_original.append(se_star.luminosity)
###BOOKLISTSTART1###
number_of_zones = se_star.get_number_of_zones()
composition = se_star.get_chemical_abundance_profiles()
index = (composition[0] > 1.0e-9).nonzero()[0][0] # first zone with X > 1.0e-9
print("Creating helium star, from the inner", index,
"(out of", str(number_of_zones)+") shells.")
helium_star = stellar_evolution.new_particle_from_model(dict(
mass = (se_star.get_cumulative_mass_profile() * se_star.mass)[:index],
radius = se_star.get_radius_profile()[:index],
rho = se_star.get_density_profile()[:index],
temperature = se_star.get_temperature_profile()[:index],
luminosity = se_star.get_luminosity_profile()[:index],
X_H = composition[0][:index],
X_He = composition[1][:index] + composition[2][:index],
X_C = composition[3][:index],
X_N = composition[4][:index],
X_O = composition[5][:index],
X_Ne = composition[6][:index],
X_Mg = composition[7][:index],
X_Si = composition[7][:index]*0.0,
X_Fe = composition[7][:index]*0.0), 0.0 | units.Myr)
###BOOKLISTSTOP1###
print("\nStar properties before helium star evolution:\n",
stellar_evolution.particles)
for i in range(1000):
helium_star.evolve_one_step()
temperatures_helium.append(helium_star.temperature)
luminosities_helium.append(helium_star.luminosity)
print("\nStar properties after helium star evolution:\n",
stellar_evolution.particles)
stellar_evolution.stop()
return temperatures_original, luminosities_original, \
temperatures_helium, luminosities_helium
def handle_collision(self, primary, secondary, stellar_evolution_code=None, gravity_code=None):
primary = self.add_particle_with_internal_structure(primary, stellar_evolution_code=stellar_evolution_code)
secondary = self.add_particle_with_internal_structure(secondary, stellar_evolution_code=stellar_evolution_code)
merge_product = Particle(
key = self.key_for_merge_product(primary, secondary),
primary = primary,
secondary = secondary
)
return self.merge_products.add_particles(merge_product.as_set())
def main():
temperatures_original = [] | units.K
luminosities_original = [] | units.LSun
temperatures_helium = [] | units.K
luminosities_helium = [] | units.LSun
star = Particle()
star.mass = 12.0 | units.MSun
stop_radius = 100 | units.RSun
stellar_evolution = MESA()
se_star = stellar_evolution.particles.add_particle(star)
print("Evolving a", star.mass, "star with",
stellar_evolution.__class__.__name__, end=' ')
print("until its radius exceeds", stop_radius)
while (se_star.radius < stop_radius):
se_star.evolve_one_step()
temperatures_original.append(se_star.temperature)
luminosities_original.append(se_star.luminosity)
###BOOKLISTSTART1###
number_of_zones = se_star.get_number_of_zones()
composition = se_star.get_chemical_abundance_profiles()
index = (composition[0] > 1.0e-9).nonzero()[0][0] # first zone with X > 1.0e-9
print("Creating helium star, from the inner", index,
"(out of", str(number_of_zones)+") shells.")
helium_star = stellar_evolution.new_particle_from_model(dict(
mass = (se_star.get_cumulative_mass_profile() * se_star.mass)[:index],
radius = se_star.get_radius_profile()[:index],
rho = se_star.get_density_profile()[:index],
temperature = se_star.get_temperature_profile()[:index],
luminosity = se_star.get_luminosity_profile()[:index],
X_H = composition[0][:index],
X_He = composition[1][:index] + composition[2][:index],
X_C = composition[3][:index],
X_N = composition[4][:index],
X_O = composition[5][:index],
X_Ne = composition[6][:index],
X_Mg = composition[7][:index],
X_Si = composition[7][:index]*0.0,
X_Fe = composition[7][:index]*0.0), 0.0 | units.Myr)
###BOOKLISTSTOP1###
print("\nStar properties before helium star evolution:\n",
stellar_evolution.particles)
for i in range(1000):
helium_star.evolve_one_step()
temperatures_helium.append(helium_star.temperature)
luminosities_helium.append(helium_star.luminosity)
print("\nStar properties after helium star evolution:\n",
stellar_evolution.particles)
stellar_evolution.stop()
return temperatures_original, luminosities_original, \
temperatures_helium, luminosities_helium
def test7(self):
print "Testing Pikachu states"
stars = new_plummer_model(100)
black_hole = Particle()
black_hole.mass = 1.0 | nbody_system.mass
black_hole.radius = 0.0 | nbody_system.length
black_hole.position = [0.0, 0.0, 0.0] | nbody_system.length
black_hole.velocity = [0.0, 0.0, 0.0] | nbody_system.speed
print "First do everything manually:"
instance = self.new_instance_of_an_optional_code(Pikachu, **default_options)
self.assertEquals(instance.get_name_of_current_state(), 'UNINITIALIZED')
instance.initialize_code()
self.assertEquals(instance.get_name_of_current_state(), 'INITIALIZED')
#~ instance.parameters.rcut_out_star_star = 1.0 | nbody_system.length
instance.parameters.timestep = 0.001 | nbody_system.time
instance.commit_parameters()
self.assertEquals(instance.get_name_of_current_state(), 'EDIT')
instance.particles.add_particles(stars)
instance.commit_particles()
self.assertEquals(instance.get_name_of_current_state(), 'RUN')
instance.particles.remove_particle(stars[0])
instance.particles.add_particle(black_hole)
self.assertEquals(instance.get_name_of_current_state(), 'UPDATE')
instance.recommit_particles()
self.assertEquals(instance.get_name_of_current_state(), 'RUN')
instance.evolve_model(0.001 | nbody_system.time)
self.assertEquals(instance.get_name_of_current_state(), 'EVOLVED')
instance.synchronize_model()
self.assertEquals(instance.get_name_of_current_state(), 'RUN')
instance.cleanup_code()
self.assertEquals(instance.get_name_of_current_state(), 'END')
instance.stop()
print "initialize_code(), commit_parameters(), (re)commit_particles(), " \
"synchronize_model(), and cleanup_code() should be called " \
"automatically before editing parameters, new_particle(), get_xx(), and stop():"
instance = self.new_instance_of_an_optional_code(Pikachu, **default_options)
self.assertEquals(instance.get_name_of_current_state(), 'UNINITIALIZED')
instance.parameters.timestep = 0.001 | nbody_system.time
self.assertEquals(instance.get_name_of_current_state(), 'INITIALIZED')
instance.particles.add_particles(stars)
self.assertEquals(instance.get_name_of_current_state(), 'EDIT')
mass = instance.particles[0].mass
self.assertEquals(instance.get_name_of_current_state(), 'RUN')
instance.particles.remove_particle(stars[0])
instance.particles.add_particle(black_hole)
self.assertEquals(instance.get_name_of_current_state(), 'UPDATE')
mass = instance.particles[0].mass
self.assertEquals(instance.get_name_of_current_state(), 'RUN')
instance.evolve_model(0.001 | nbody_system.time)
self.assertEquals(instance.get_name_of_current_state(), 'EVOLVED')
mass = instance.particles[0].mass
self.assertEquals(instance.get_name_of_current_state(), 'RUN')
instance.stop()
self.assertEquals(instance.get_name_of_current_state(), 'STOPPED')
def __init__(self, potential, particle=None):
self.potential = potential
if particle is None:
particle = Particle()
particle.position = [0., 0., 0.] | units.parsec
particle.velocity = [0., 0., 0.] | units.kms
self.particles = Particles()
self.particles.add_particle(particle)
def __init__(self, potential, particle=None):
self.potential = potential
if particle is None:
particle = Particle()
particle.position = [0., 0., 0.] | units.parsec
particle.velocity = [0., 0., 0.] | units.kms
self.particles = Particles()
self.particles.add_particle(particle)
def xtest7(self):
instance = self.new_instance_of_an_optional_code(SeBa)
instance.parameters.metallicity = 0.03
p = Particle()
p.mass = 99.1605930967 | units.MSun
p = instance.particles.add_particle(p)
instance.evolve_model(614 | units.Myr)
print p.stellar_type
self.assertEquals(str(p.stellar_type),'Black Hole')
self.assertAlmostRelativeEqual(p.mass, 0.9906 | units.MSun, 4)
def xtest7(self):
instance = self.new_instance_of_an_optional_code(SeBa)
instance.parameters.metallicity = 0.03
p = Particle()
p.mass = 99.1605930967 | units.MSun
p = instance.particles.add_particle(p)
instance.evolve_model(614 | units.Myr)
print(p.stellar_type)
self.assertEqual(str(p.stellar_type), 'Black Hole')
self.assertAlmostRelativeEqual(p.mass, 0.9906 | units.MSun, 4)
def merge_two_stars(primary, secondary):
"Merge two colliding stars into one new one"
colliders = Particles()
colliders.add_particle(primary)
colliders.add_particle(secondary)
new_particle = Particle()
new_particle.mass = colliders.mass.sum()
new_particle.position = colliders.center_of_mass()
new_particle.velocity = colliders.center_of_mass_velocity()
return new_particle
def test2(self):
instance = self.new_instance_of_an_optional_code(SeBa)
p = Particle()
p.mass = 5 | units.MSun
p.metallicity = 0.02
p = instance.particles.add_particle(p)
instance.evolve_model(130 | units.Myr)
print(p)
self.assertAlmostRelativeEqual(p.mass, 0.9906 | units.MSun, 4)
def set_up_outer_star(inner_binary_mass):
semimajor_axis = triple_parameters["a_out"]
eccentricity = triple_parameters["eccentricity_out"]
print " Initializing outer star"
giant = Particle()
giant.mass = triple_parameters["mass_out"]
giant.position = semimajor_axis * (1 + eccentricity) * ([1, 0, 0]
| units.none)
giant.velocity = get_relative_velocity_at_apastron(
giant.mass + inner_binary_mass, semimajor_axis,
eccentricity) * ([0, 1, 0] | units.none)
return giant
def set_up_outer_star(inner_binary_mass):
semimajor_axis = 1.22726535008 | units.AU
eccentricity = 0.15
inclination = math.radians(9.0)
print " Initializing outer star"
giant = Particle()
giant.mass = 5.5 | units.MSun
giant.position = semimajor_axis * ([math.cos(inclination), 0, math.sin(inclination)] | units.none)
giant.velocity = get_relative_velocity(giant.mass + inner_binary_mass,
semimajor_axis, eccentricity) * ([0, 1, 0] | units.none)
return giant
def set_up_outer_star(inner_binary_mass):
semimajor_axis = 1.22726535008 | units.AU
eccentricity = 0.15
inclination = math.radians(9.0)
print(" Initializing outer star")
giant = Particle()
giant.mass = 5.5 | units.MSun
giant.position = semimajor_axis * ([math.cos(inclination), 0, math.sin(inclination)] | units.none)
giant.velocity = get_relative_velocity(giant.mass + inner_binary_mass,
semimajor_axis, eccentricity) * ([0, 1, 0] | units.none)
return giant
def test2(self):
instance = self.new_instance_of_an_optional_code(SeBa)
p = Particle()
p.mass = 5 | units.MSun
p.metallicity = 0.02
p = instance.particles.add_particle(p)
instance.evolve_model(130 | units.Myr)
print p
self.assertAlmostRelativeEqual(p.mass, 0.9906 | units.MSun, 4)
def test1(self):
print "Testing FastKick (SI)"
sun = Particle()
sun.mass = 1.0|units.MSun
sun.position = [0, 0, 0] | units.m
convert_nbody = nbody_system.nbody_to_si(1.0 | units.MSun, 1.0 | units.AU)
fastkick = self.new_fastkick_instance(convert_nbody)
fastkick.particles.add_particle(sun)
ax, ay, az = fastkick.get_gravity_at_point(0|units.AU, 1|units.AU, 0|units.AU, 0|units.AU)
fastkick.stop()
self.assertAlmostRelativeEqual(ax, -4*math.pi**2 | units.AU / units.yr**2, 3)
self.assertAlmostRelativeEqual(ay, 0 | units.m * units.s**-2, 6)
self.assertAlmostRelativeEqual(az, 0 | units.m * units.s**-2, 6)
def setup_system():
"""
Galacitic center potential and Arches cluster
position from Kruijssen 2014
"""
potential = static_potentials.Galactic_Center_Potential_Kruijssen()
cluster = Particle()
# At time 2.05 in KDL15
cluster.position = [-17.55767, -53.26560, -9.39921] | units.parsec
cluster.velocity = [-187.68008, 80.45276, 33.96556] | units.kms
cluster.position += coordinate_correction
return potential, cluster
def make_binary_star(mprim, msec, semimajor_axis, eccentricity):
double_star = Particle()
double_star.is_binary = True
double_star.mass = mprim + msec
double_star.semimajor_axis = semimajor_axis
double_star.eccentricity = eccentricity
period = (2 * numpy.pi *
(semimajor_axis * semimajor_axis * semimajor_axis /
(constants.G * double_star.mass)).sqrt())
print("Period =", period.as_string_in(units.yr))
stars = new_binary_from_orbital_elements(mprim,
msec,
semimajor_axis,
eccentricity,
G=constants.G)
stars.is_binary = False
double_star.child1 = stars[0]
double_star.child1.name = "primary"
double_star.child2 = stars[1]
double_star.child2.name = "secondary"
for star in stars:
star.radius = (star.mass.value_in(units.MSun)**0.8) | units.RSun
return double_star, stars
def setup_system():
"""
Galacitic center potential and Arches cluster
position from Kruijssen 2014
"""
potential = static_potentials.Galactic_Center_Potential_Kruijssen()
cluster = Particle()
# At time 2.05 in KDL15
cluster.position = [-17.55767, -53.26560, -9.39921] | units.parsec
cluster.velocity = [-187.68008, 80.45276, 33.96556] | units.kms
cluster.position += coordinate_correction
return potential, cluster
def new_system(star_mass=1 | units.MSun,
star_radius=1 | units.RSun,
disk_minimum_radius=0.05 | units.AU,
disk_maximum_radius=10 | units.AU,
disk_mass=20 | MEarth,
accurancy=0.0001,
planet_density=3 | units.g / units.cm**3,
rng=None,
kepler=None):
central_particle = Particle()
central_particle.mass = star_mass
central_particle.position = (0, 0, 0) | units.AU
central_particle.velocity = (0, 0, 0) | units.kms
central_particle.radius = star_radius
central_particle.name = "star"
central_particle.type = "star"
central_particle.id = 0
if rng is None:
rng = numpy.random
converter = nbody_system.nbody_to_si(1 | units.MSun, 1 | units.AU)
if kepler is None:
kepler = Kepler(converter)
kepler.initialize_code()
m, r, f = new_planet_distribution(disk_minimum_radius, disk_maximum_radius,
disk_mass, accurancy)
planets = make_planets(central_particle,
m,
r,
density=planet_density,
phi=0,
theta=None,
kepler=kepler,
rng=rng)
planets.name = "planet"
planets.type = "planet"
for i in range(len(planets)):
planets[i].id = i
central_particle.planets = planets
kepler.stop()
p = Particles()
p.add_particle(central_particle)
return p
def create_particles():
star = Particle()
star.mass = 3.0 | units.MSun
stellar_evolution = EVtwin()
se_star = stellar_evolution.particles.add_particle(star)
print("Evolving", star.mass, "star with",
stellar_evolution.__class__.__name__, "up to", 100 | units.Myr)
stellar_evolution.evolve_model(100 | units.Myr)
print("Creating SPH particles from the (1D) stellar evolution model")
sph_particles = convert_stellar_model_to_SPH(se_star, 1000).gas_particles
stellar_evolution.stop()
return sph_particles
def test19(self):
print("SSE core_mass and CO_core_mass (high mass star)")
instance = SSE()
star = instance.particles.add_particle(Particle(mass = 30 | units.MSun))
instance.evolve_model(5.8 | units.Myr)
print(star.mass, star.core_mass, star.CO_core_mass, star.stellar_type)
self.assertEqual(str(star.stellar_type), "Main Sequence star")
self.assertIsOfOrder(star.mass, 30 | units.MSun)
self.assertEqual(star.core_mass, 0 | units.MSun)
self.assertEqual(star.CO_core_mass, 0 | units.MSun)
instance.evolve_model(6.0 | units.Myr)
print(star.mass, star.core_mass, star.CO_core_mass, star.stellar_type)
self.assertEqual(str(star.stellar_type), "Core Helium Burning")
self.assertIsOfOrder(star.mass, 30 | units.MSun)
self.assertIsOfOrder(star.core_mass, 10 | units.MSun)
self.assertEqual(star.CO_core_mass, 0 | units.MSun)
instance.evolve_model(6.5 | units.Myr)
print(star.mass, star.core_mass, star.CO_core_mass, star.stellar_type)
self.assertEqual(str(star.stellar_type), "Main Sequence Naked Helium star")
self.assertIsOfOrder(star.mass, 10 | units.MSun)
self.assertEqual(star.core_mass, star.mass)
self.assertEqual(star.CO_core_mass, 0 | units.MSun)
instance.evolve_model(6.65 | units.Myr)
print(star.mass, star.core_mass, star.CO_core_mass, star.stellar_type)
self.assertEqual(str(star.stellar_type), "Hertzsprung Gap Naked Helium star")
self.assertIsOfOrder(star.mass, 10 | units.MSun)
self.assertEqual(star.core_mass, star.mass)
self.assertAlmostEqual(star.CO_core_mass, 7.12 | units.MSun, 2)
instance.evolve_model(7.0 | units.Myr)
print(star.mass, star.core_mass, star.CO_core_mass, star.stellar_type)
self.assertEqual(str(star.stellar_type), "Black Hole")
self.assertIsOfOrder(star.mass, 10 | units.MSun)
self.assertEqual(star.core_mass, star.mass)
self.assertEqual(star.CO_core_mass, star.mass)
instance.stop()
def slowtest5(self):
print "Test convert_SPH_to_stellar_model result in EVtwin"
stellar_evolution = EVtwin()
stellar_evolution.parameters.verbosity = True
stellar_evolution.particles.add_particle(
Particle(mass=1.0 | units.MSun)) # reference particle
stellar_evolution.evolve_model(100.0 | units.Myr)
model = convert_SPH_to_stellar_model(
self.new_particles()) # model is from center to surface
stellar_evolution.new_particle_from_model(model, 0.0 | units.Myr)
print stellar_evolution.particles
self.assertAlmostEqual(stellar_evolution.particles.age,
[100.0, 0.0] | units.Myr, 1)
stellar_evolution.evolve_model(200.0 | units.Myr)
print stellar_evolution.particles
self.assertAlmostEqual(stellar_evolution.particles.age,
[200.0, 100.0] | units.Myr, 1)
self.assertAlmostRelativeEqual(
stellar_evolution.particles[0].temperature,
stellar_evolution.particles[1].temperature, 2)
self.assertAlmostRelativeEqual(
stellar_evolution.particles[0].luminosity,
stellar_evolution.particles[1].luminosity, 2)
stellar_evolution.stop()
def test18(self):
print("MOSSE validation")
mosse_src_path = os.path.join(os.path.dirname(sys.modules[MOSSE.__module__].__file__), 'src')
if not os.path.exists(os.path.join(mosse_src_path, "evolve.in")):
self.skip("Not in a source release")
instance = MOSSE()
instance.particles.add_particle(Particle(mass = 1.416 | units.MSun))
instance.particles[0].evolve_for(7000.0 | units.Myr)
evolved_star = instance.particles.copy()[0]
evolved_star.temperature = instance.particles[0].temperature
instance.stop()
testpath = get_path_to_results()
shutil.copy(os.path.join(sse_src_path, "evolve.in"), os.path.join(testpath, "evolve.in"))
call([os.path.join(sse_src_path, "mosse")], cwd=testpath)
with open(os.path.join(testpath, "evolve.dat"), "r") as sse_output:
lines = sse_output.readlines()
sse_final_result = lines[-2].split()
self.assertAlmostEqual(evolved_star.age, float(sse_final_result[0]) | units.Myr, 3)
self.assertAlmostEqual(evolved_star.stellar_type, float(sse_final_result[1]) | units.stellar_type, 3)
self.assertAlmostEqual(evolved_star.initial_mass, float(sse_final_result[2]) | units.MSun, 3)
self.assertAlmostEqual(evolved_star.mass, float(sse_final_result[3]) | units.MSun, 3)
self.assertAlmostEqual(evolved_star.luminosity, 10**float(sse_final_result[4]) | units.LSun, 3)
self.assertAlmostEqual(evolved_star.radius, 10**float(sse_final_result[5]) | units.RSun, 3)
self.assertAlmostRelativeEqual(evolved_star.temperature, 10**float(sse_final_result[6]) | units.K, 2)
self.assertAlmostEqual(evolved_star.core_mass, float(sse_final_result[7]) | units.MSun, 3)
self.assertAlmostEqual(evolved_star.convective_envelope_mass, float(sse_final_result[8]) | units.MSun, 3)
self.assertAlmostEqual(evolved_star.epoch, float(sse_final_result[9]) | units.Myr, 3)
self.assertAlmostEqual(evolved_star.spin, float(sse_final_result[10]) | units.yr**-1, 3)
def structure_from_star(mass, age):
stellar_evolution = EVtwin()
star = stellar_evolution.particles.add_particle(Particle(mass=mass))
star.evolve_for(age)
radius_profile = star.get_radius_profile()
density_profile = star.get_density_profile()
if hasattr(star, "get_mass_profile"):
mass_profile = star.get_mass_profile() * star.mass
else:
radii_cubed = radius_profile**3
radii_cubed.prepend(0 | units.m**3)
mass_profile = (
(4.0 / 3.0 * numpy.pi) * density_profile
* (radii_cubed[1:] - radii_cubed[:-1])
)
print("Derived mass profile from density and radius.")
return dict(
radius=radius_profile.as_quantity_in(units.RSun),
density=density_profile,
mass=mass_profile,
temperature=star.get_temperature_profile(),
pressure=star.get_pressure_profile(),
composition=star.get_chemical_abundance_profiles(),
species_names=star.get_names_of_species()
)
def xtest18(self):
print "Testing EVtwin calculate_core_mass"
instance = EVtwin()#redirection="none")
star = instance.particles.add_particle(Particle(mass=1|units.MSun))
instance.evolve_model(0.4|units.Gyr) # VERY short, for test speed up
central_hydrogen_abundance = star.get_chemical_abundance_profiles()[0][0]
self.assertTrue(central_hydrogen_abundance < 0.68) # some hydrogen is burned
self.assertTrue(central_hydrogen_abundance > 0.67) # ... but not that much yet
self.assertEqual(star.calculate_core_mass(core_H_abundance_limit=0.67), 0 | units.MSun)
self.assertAlmostEqual(star.calculate_core_mass(core_H_abundance_limit=0.71), 1 | units.MSun, 1)
# For test speed up, we use a weird core_H_abundance_limit to define the "hydrogen exhausted core"
limit = 0.68
expected_core_mass = 0.0123182798542 | units.MSun
self.assertAlmostEqual(star.calculate_core_mass(core_H_abundance_limit=limit), expected_core_mass, 3)
species_names = star.get_names_of_species()
self.assertEquals(species_names, ['h1', 'he4', 'c12', 'n14', 'o16', 'ne20', 'mg24', 'si28', 'fe56'])
h1_core_mass = star.calculate_core_mass(species=["h1"], core_H_abundance_limit=limit)
he4_core_mass = star.calculate_core_mass(species=["he4"], core_H_abundance_limit=limit)
c12_core_mass = star.calculate_core_mass(species=["c12"], core_H_abundance_limit=limit)
n14_core_mass = star.calculate_core_mass(species=["n14"], core_H_abundance_limit=limit)
o16_core_mass = star.calculate_core_mass(species=["o16"], core_H_abundance_limit=limit)
ne20_core_mass = star.calculate_core_mass(species=["ne20"], core_H_abundance_limit=limit)
mg24_core_mass = star.calculate_core_mass(species=["mg24"], core_H_abundance_limit=limit)
si28_core_mass = star.calculate_core_mass(species=["si28"], core_H_abundance_limit=limit)
fe56_core_mass = star.calculate_core_mass(species=["fe56"], core_H_abundance_limit=limit)
metal_core_mass = star.calculate_core_mass(species=["c12", "n14", "o16", "ne20", "mg24", "si28", "fe56"], core_H_abundance_limit=limit)
instance.stop()
self.assertAlmostRelativeEqual(h1_core_mass, expected_core_mass*0.68, 2)
self.assertAlmostRelativeEqual(he4_core_mass, expected_core_mass*0.30, 2)
self.assertAlmostRelativeEqual(metal_core_mass, expected_core_mass*0.02, 1)
self.assertAlmostRelativeEqual(expected_core_mass, he4_core_mass + metal_core_mass + h1_core_mass, 7)
self.assertAlmostRelativeEqual(metal_core_mass, c12_core_mass + n14_core_mass +
o16_core_mass + ne20_core_mass + mg24_core_mass + si28_core_mass + fe56_core_mass, 7)
def get_orbital_elements_from_binary(binary, G=nbody_system.G):
"""
Function that computes orbital elements from given two-particle set.
Elements are computed for the second particle in this set and the
return values are: mass1, mass2, semimajor axis, eccentricity,
cosine of true anomaly, cosine of inclination, cosine of the
longitude of the ascending node and the cosine of the argument of
pericenter. In case of a perfectly circular orbit the true anomaly
and argument of pericenter cannot be determined; in this case the
return values are 1.0 for both cosines.
"""
primaries = Particles()
secondaries = Particles()
if len(binary) > 2:
raise Exception("expects binary or single part")
elif len(binary) == 2:
primaries.add_particle(binary[0])
secondaries.add_particle(binary[1])
else:
# FIXME: in case of one particle, what do we calculate the orbit of?
# The method below is what was default before.
primaries.add_particle(binary[0])
primaries[0].position *= 0
primaries[0].velocity *= 0
secondaries.add_particle(Particle())
secondaries[0].mass = 0 * primaries[0].mass
secondaries[0].position = binary.position
secondaries[0].velocity = binary.velocity
(mass1, mass2, semimajor_axis, eccentricity, true_anomaly, inclination,
long_asc_node, arg_per) = get_orbital_elements_from_binaries(primaries,
secondaries,
G=G)
return (mass1[0], mass2[0], semimajor_axis[0], eccentricity[0],
true_anomaly[0], inclination[0], long_asc_node[0], arg_per[0])
def test1(self):
print("Testing FastKick (SI)")
sun = Particle()
sun.mass = 1.0 | units.MSun
sun.position = [0, 0, 0] | units.m
convert_nbody = nbody_system.nbody_to_si(1.0 | units.MSun,
1.0 | units.AU)
fastkick = self.new_fastkick_instance(convert_nbody)
fastkick.particles.add_particle(sun)
ax, ay, az = fastkick.get_gravity_at_point(0 | units.AU, 1 | units.AU,
0 | units.AU, 0 | units.AU)
fastkick.stop()
self.assertAlmostRelativeEqual(
ax, -4 * math.pi**2 | units.AU / units.yr**2, 3)
self.assertAlmostRelativeEqual(ay, 0 | units.m * units.s**-2, 6)
self.assertAlmostRelativeEqual(az, 0 | units.m * units.s**-2, 6)
def convert_star_to_hydro_model(M, t_end):
stellar_evolution = EVtwin()
star = stellar_evolution.particles.add_particle(Particle(mass=M))
stellar_evolution.evolve_model(t_end)
Ngas = 10000
sph_particles = convert_stellar_model_to_SPH(star, Ngas).gas_particles
stellar_evolution.stop()
return sph_particles
def set_up_outer_star(inner_binary_mass):
orbital_period = 4020.0 | units.day
mass = 1.3 | units.MSun
semimajor_axis = (((constants.G *
(inner_binary_mass + mass) * orbital_period**2) /
(4 * numpy.pi**2))**(1.0 / 3.0)).as_quantity_in(
units.RSun)
print " Initializing outer star"
print " Semimajor axis outer binary:", semimajor_axis
giant = Particle()
giant.mass = mass
giant.position = semimajor_axis * ([1, 0, 0] | units.none)
giant.velocity = get_relative_velocity(giant.mass + inner_binary_mass,
semimajor_axis,
0) * ([0, 1, 0] | units.none)
return giant
def create_particles():
star = Particle()
star.mass = 3.0 | units.MSun
stellar_evolution = EVtwin()
se_star = stellar_evolution.particles.add_particle(star)
print("Evolving", star.mass, "star with", stellar_evolution.__class__.__name__, "up to", 100 | units.Myr)
stellar_evolution.evolve_model(100 | units.Myr)
print("Creating SPH particles from the (1D) stellar evolution model")
sph_particles = convert_stellar_model_to_SPH(
se_star,
1000
).gas_particles
stellar_evolution.stop()
return sph_particles
def brunt_vaisala_frequency_squared_profile(mass, age):
stellar_evolution = MESA()
star = stellar_evolution.particles.add_particle(Particle(mass=mass))
star.evolve_for(age)
radius_profile = star.get_radius_profile()
brunt_profile = star.get_brunt_vaisala_frequency_squared_profile()
stellar_evolution.stop()
return radius_profile.as_quantity_in(units.RSun), brunt_profile
def test12(self):
N = 1000
Lstar = 100 | units.LSun
boxsize = 10 | units.parsec
rho = 1.0 | (units.amu / units.cm**3)
t_end = 0.01 | units.Myr
internal_energy = (9. | units.kms)**2
source = Particle()
source.position = (0, 0, 0) | units.parsec
source.flux = Lstar / (20. | units.eV)
source.rho = rho
source.xion = 0.0
source.u = internal_energy
ism = ism_cube(N, boxsize / 2., rho, internal_energy).result
ism.rho = rho
ism.flux = 0. | units.s**-1
ism.xion = source.xion
radiative = SimpleX()
radiative.parameters.box_size = 1.001 * boxsize
radiative.parameters.timestep = 0.001 | units.Myr
radiative.particles.add_particle(source)
radiative.particles.add_particles(ism)
radiative.evolve_model(t_end)
self.assertAlmostRelativeEquals(0.0750819123073,
radiative.particles.xion.mean(), 1)
radiative.stop()
def test3(self):
particles = Particles(2)
particles.add_attribute_domain('a')
particles.add_attribute_domain('b')
particles.a.foo = 1 | units.m
particles.b.foo = 2 | units.kg
particles.foo = 3 | units.s
particles.a.add_particle(Particle(foo=2 | units.m))
self.assertAlmostRelativeEqual(particles.a.foo, [1, 1, 2] | units.m)
self.assertAlmostRelativeEqual(particles.b.foo, [2, 2, 0] | units.kg)
self.assertAlmostRelativeEqual(particles.foo, [3, 3, 0] | units.s)
particles.add_particle(Particle(foo=2 | units.s))
self.assertAlmostRelativeEqual(particles.a.foo, [1, 1, 2, 0] | units.m)
self.assertAlmostRelativeEqual(particles.b.foo,
[2, 2, 0, 0] | units.kg)
self.assertAlmostRelativeEqual(particles.foo, [3, 3, 0, 2] | units.s)
def get_moons_for_planet(planet, delta_JD=0. | units.day):
"""
The Earth's moon
as for JD = 2457099.500000000 = A.D. 2015-Mar-18 00:00:00.0000 (CT)
https://ssd.jpl.nasa.gov/?sat_elem
"""
data = numpy.array([tuple(entry) for entry in _lunar_data],
dtype=[('planet_name', 'S10'), ('name', 'S10'),
('mass', '<f8'), ('radius', '<f8'),
('semimajor_axis', '<f8'),
('eccentricity', '<f8'),
('argument_of_peri', '<f8'),
('mean_anomaly', '<f8'), ('inclination', '<f8'),
('longitude_oan', '<f8')])
moon_data = data[data['planet_name'] == planet.name.encode('UTF-8')]
print("Planet=", planet.name, "moon=", moon_data["name"])
moons = Particles()
if len(moon_data["name"]):
print(len(moon_data["name"]))
for moon in moon_data:
#Ignore the moon for now, because it's complicated
if planet.name == "EarthMoon":
planet.mass -= moon["mass"] * 1.e+16 | units.kg
planet.name = "Earth"
#print moon
r, v = get_position(planet.mass,
moon["mass"] * 1.e+16 | units.kg,
moon["eccentricity"],
moon["semimajor_axis"] | units.km,
numpy.deg2rad(moon["mean_anomaly"]),
numpy.deg2rad(moon["inclination"]),
numpy.deg2rad(moon["longitude_oan"]),
numpy.deg2rad(moon["argument_of_peri"]),
delta_t=delta_JD)
single_moon = Particle()
single_moon.type = "moon"
single_moon.name = moon["name"]
single_moon.mass = moon["mass"] * 1.e+16 | units.kg
single_moon.hostname = moon["planet_name"]
single_moon.radius = moon["radius"] | units.km
single_moon.position = r
single_moon.position += planet.position
single_moon.velocity = v
single_moon.velocity += planet.velocity
moons.add_particle(single_moon)
return moons
def nbody_integrator(Ncl, mcl, rcl, t_end, n_steps, escape_velocity_fraction,
R):
converter = nbody_system.nbody_to_si(mcl, rcl)
bodies = new_plummer_model(Ncl, convert_nbody=converter)
#estimate of milky way mass by "Mass models of the Milky Way", McMillan
blackhole_mass = 1.26e12 | units.MSun
blackhole = Particle(mass=blackhole_mass)
blackhole.position = [0, 0, 0] | units.m
cluster_velocity = [0, 0, 0] | units.m / units.s
cluster_position = [0, 0, 0] | units.parsec
cluster_position[0] = R
G_si = converter.to_si(nbody_system.G)
escape_v = (2 * G_si * blackhole_mass / R).sqrt().as_quantity_in(units.m /
units.s)
V = escape_v * escape_velocity_fraction
cluster_velocity[1] = V
bodies.move_to_center()
bodies.velocity += cluster_velocity
bodies.position += cluster_position
bodies.add_particle(blackhole)
gravity = BHTree(converter)
gravity.particles.add_particles(bodies)
channel_from_gravity_to_framework = gravity.particles.\
new_channel_to(bodies)
time = zero
dt = t_end / float(n_steps)
x = 0
base_path = "encounter_plots/"+str(R.value_in(units.parsec))+"_"+\
str(escape_velocity_fraction)+"_"
while time < t_end:
plot_cluster(bodies, base_path + str(x), time, rcl, V)
time += dt
gravity.evolve_model(time)
channel_from_gravity_to_framework.copy()
x += 1
plot_cluster(bodies, base_path + str(x), time, rcl, V)
gravity.stop()
return V, bodies
def test10(self):
""" Test supernova stopping condition """
instance = self.new_instance_of_an_optional_code(SeBa)
instance.stopping_conditions.supernova_detection.enable()
p = Particle()
p.mass = 10 | units.MSun
p.metallicity = 0.02
p = instance.particles.add_particle(p)
instance.set_supernova_kick_velocity(0.0|units.kms)
instance.evolve_model(30 | units.Myr)
self.assertEquals(instance.stopping_conditions.supernova_detection.is_set(), True)
self.assertEquals(instance.stopping_conditions.supernova_detection.particles(0)[0].key, p.key)
self.assertAlmostRelativeEqual(p.age, 27.35866 | units.Myr, 4)
self.assertAlmostRelativeEqual(p.mass, 1.22632 | units.MSun, 4)
self.assertAlmostRelativeEqual(p.natal_kick_velocity, [0,0,0] | units.kms, 4)
def nbody_integrator(Ncl, mcl, rcl, t_end, n_steps, escape_velocity_fraction, R):
converter = nbody_system.nbody_to_si(mcl, rcl)
bodies = new_plummer_model(Ncl, convert_nbody=converter)
#estimate of milky way mass by "Mass models of the Milky Way", McMillan
blackhole_mass = 1.26e12 | units.MSun
blackhole = Particle(mass=blackhole_mass)
blackhole.position = [0,0,0] | units.m
cluster_velocity = [0,0,0] | units.m / units.s
cluster_position = [0,0,0] | units.parsec
cluster_position[0] = R
G_si = converter.to_si(nbody_system.G)
escape_v = (2*G_si*blackhole_mass/R).sqrt().as_quantity_in(units.m/units.s)
V = escape_v * escape_velocity_fraction
cluster_velocity[1] = V
bodies.move_to_center()
bodies.velocity += cluster_velocity
bodies.position += cluster_position
bodies.add_particle(blackhole)
gravity = BHTree(converter)
gravity.particles.add_particles(bodies)
channel_from_gravity_to_framework = gravity.particles.\
new_channel_to(bodies)
time = zero
dt = t_end / float(n_steps)
x = 0
base_path = "encounter_plots/"+str(R.value_in(units.parsec))+"_"+\
str(escape_velocity_fraction)+"_"
while time < t_end:
plot_cluster(bodies, base_path+str(x),time, rcl, V)
time += dt
gravity.evolve_model(time)
channel_from_gravity_to_framework.copy()
x+=1
plot_cluster(bodies, base_path+str(x),time, rcl, V)
gravity.stop()
return V, bodies
def old_new_solar_system():
"""
Create initial conditions describing the solar system. Returns a single
particle set containing the sun, planets and Pluto. The model is centered at
the origin (center-of-mass(-velocity) coordinates).
Defined attributes:
name, mass, radius, x, y, z, vx, vy, vz
"""
sun = Particle()
sun.name = 'SUN'
sun.mass = 1.0 | units.MSun
sun.radius = 1.0 | units.RSun
planets = _planets_only()
particles = Particles()
particles.add_particle(sun)
particles.add_particles(planets)
particles.move_to_center()
return particles
def test12(self):
N = 1000
Lstar=100|units.LSun
boxsize=10|units.parsec
rho=1.0 | (units.amu/units.cm**3)
t_end=0.01 |units.Myr
internal_energy = (9. |units.kms)**2
source=Particle()
source.position = (0, 0, 0) |units.parsec
source.flux = Lstar/(20. | units.eV)
source.rho = rho
source.xion = 0.0
source.u = internal_energy
ism = ism_cube(N, boxsize/2., rho, internal_energy).result
ism.rho = rho
ism.flux = 0. | units.s**-1
ism.xion = source.xion
radiative = SimpleX()
radiative.parameters.box_size=1.001*boxsize
radiative.parameters.timestep=0.001 | units.Myr
radiative.particles.add_particle(source)
radiative.particles.add_particles(ism)
radiative.evolve_model(t_end)
self.assertAlmostRelativeEquals( 0.0750819123073, radiative.particles.xion.mean(), 1)
radiative.stop()
def get_moons_for_planet(planet, delta_JD=0.|units.day):
"""
The Earth's moon
as for JD = 2457099.500000000 = A.D. 2015-Mar-18 00:00:00.0000 (CT)
https://ssd.jpl.nasa.gov/?sat_elem
"""
data = numpy.array([tuple(entry) for entry in _lunar_data],
dtype=[('planet_name','S10'), ('name','S10'),
('mass','<f8'), ('radius','<f8'), ('semimajor_axis','<f8'),
('eccentricity','<f8'), ('argument_of_peri','<f8'),
('mean_anomaly','<f8'), ('inclination','<f8'), ('longitude_oan','<f8')])
moon_data = data[data['planet_name']==planet.name]
print "Planet=", planet.name, "moon=", moon_data["name"]
moons = Particles()
if len(moon_data["name"]):
print len(moon_data["name"])
for moon in moon_data:
#print moon
r, v = get_position(planet.mass,
moon["mass"] * 1.e+16 | units.kg,
moon["eccentricity"],
moon["semimajor_axis"]|units.km,
numpy.deg2rad(moon["mean_anomaly"]),
numpy.deg2rad(moon["inclination"]),
numpy.deg2rad(moon["longitude_oan"]),
numpy.deg2rad(moon["argument_of_peri"]),
delta_t=delta_JD)
single_moon = Particle()
single_moon.type = "moon"
single_moon.name = moon["name"]
single_moon.mass = moon["mass"] * 1.e+16 | units.kg
single_moon.hostname = moon["planet_name"]
single_moon.radius = moon["radius"] | units.km
single_moon.position = r
single_moon.position += planet.position
single_moon.velocity = v
single_moon.velocity += planet.velocity
moons.add_particle(single_moon)
return moons
def new_system(
star_mass = 1|units.MSun,
star_radius = 1|units.RSun,
disk_minumum_radius = 0.05 | units.AU,
disk_maximum_radius = 10 | units.AU,
disk_mass = 20 | MEarth,
accurancy = 0.0001,
planet_density = 3 | units.g/units.cm**3,
rng = None,
kepler = None):
central_particle = Particle()
central_particle.mass = star_mass
central_particle.position = (0,0,0) | units.AU
central_particle.velocity = (0,0,0) | units.kms
central_particle.radius = star_radius
if rng is None:
rng = numpy.random
converter = nbody_system.nbody_to_si(1|units.MSun, 1 | units.AU)
if kepler is None:
kepler = Kepler(converter)
kepler.initialize_code()
m, r, f = new_planet_distribution(
disk_minumum_radius, disk_maximum_radius,
disk_mass,
accurancy
)
planets = make_planets(
central_particle,
m, r,
density = planet_density,
phi = 0, theta = None,
kepler = kepler,
rng = rng
)
central_particle.planets = planets
kepler.stop()
p = Particles()
p.add_particle(central_particle)
return p
def new_particle_from_cluster_core(
particles, unit_converter=None, density_weighting_power=2, cm=None, reuse_hop=False, hop=HopContainer()
):
"""
Uses Hop to find the density centre (core) of a particle distribution
and stores the properties of this core on a particle:
position, velocity, (core) radius and (core) density.
Particles are assigned weights that depend on the density (as determined by
Hop) to a certain power.
The default weighting power is 2, which is most commonly used. Set
density_weighting_power to 1 in order to get the original weighting of
Casertano & Hut (1985, ApJ, 298, 80).
:argument unit_converter: Required if the particles are in SI units
:argument density_weighting_power: Particle properties are weighted by density to this power
"""
if isinstance(hop, HopContainer):
hop.initialize(unit_converter)
hop = hop.code
in_hop = hop.particles.add_particles(particles)
hop.parameters.density_method = 2
hop.parameters.number_of_neighbors_for_local_density = 7
hop.calculate_densities()
density = in_hop.density.copy()
if not reuse_hop:
hop.stop()
weights = (density ** density_weighting_power).reshape((-1, 1))
# Reshape makes sure that density can be multiplied with vectors, e.g. position
result = Particle()
result.density = density.amax()
total_weight = weights.sum()
if cm is None:
result.position = (weights * particles.position).sum(axis=0) / total_weight
else:
result.position = cm
result.velocity = (weights * particles.velocity).sum(axis=0) / total_weight
result.radius = (weights.flatten() * (particles.position - result.position).lengths()).sum() / total_weight
return result
def new_particle_from_model(self, internal_structure, current_age, key=None):
tmp_star = Particle(key=key)
tmp_star.mass = internal_structure["mass"]
tmp_star.radius = internal_structure["radius"]
tmp_star.type = "new particle from model" | units.string
return self.particles.add_particle(tmp_star)
def evolve_triple_with_wind(M1, M2, M3, Pora, Pin_0, ain_0, aout_0,
ein_0, eout_0, t_end, nsteps, scheme, dtse_fac):
import random
from amuse.ext.solarsystem import get_position
print "Initial masses:", M1, M2, M3
t_stellar = 4.0|units.Myr
triple = Particles(3)
triple[0].mass = M1
triple[1].mass = M2
triple[2].mass = M3
stellar = SeBa()
stellar.particles.add_particles(triple)
channel_from_stellar = stellar.particles.new_channel_to(triple)
stellar.evolve_model(t_stellar)
channel_from_stellar.copy_attributes(["mass"])
M1 = triple[0].mass
M2 = triple[1].mass
M3 = triple[2].mass
print "T=", stellar.model_time.in_(units.Myr)
print "M=", stellar.particles.mass.in_(units.MSun)
print "Masses at time T:", M1, M2, M3
# Inner binary
tmp_stars = Particles(2)
tmp_stars[0].mass = M1
tmp_stars[1].mass = M2
if Pora == 1:
ain_0 = semimajor_axis(Pin_0, M1+M2)
else:
Pin_0 = orbital_period(ain_0, M1+M2)
print 'ain_0 =', ain_0
print 'M1+M2 =', M1+M2
print 'Pin_0 =', Pin_0.value_in(units.day), '[day]'
#print 'semi:', semimajor_axis(Pin_0, M1+M2).value_in(units.AU), 'AU'
#print 'period:', orbital_period(ain_0, M1+M2).value_in(units.day), '[day]'
dt = 0.1*Pin_0
ma = 180
inc = 30
aop = 180
lon = 0
r, v = get_position(M1, M2, ein_0, ain_0, ma, inc, aop, lon, dt)
tmp_stars[1].position = r
tmp_stars[1].velocity = v
tmp_stars.move_to_center()
# Outer binary
r, v = get_position(M1+M2, M3, eout_0, aout_0, 0, 0, 0, 0, dt)
tertiary = Particle()
tertiary.mass = M3
tertiary.position = r
tertiary.velocity = v
tmp_stars.add_particle(tertiary)
tmp_stars.move_to_center()
triple.position = tmp_stars.position
triple.velocity = tmp_stars.velocity
Mtriple = triple.mass.sum()
Pout = orbital_period(aout_0, Mtriple)
print "T=", stellar.model_time.in_(units.Myr)
print "M=", stellar.particles.mass.in_(units.MSun)
print "Pout=", Pout.in_(units.Myr)
converter = nbody_system.nbody_to_si(triple.mass.sum(), aout_0)
gravity = Hermite(converter)
gravity.particles.add_particles(triple)
channel_from_framework_to_gd = triple.new_channel_to(gravity.particles)
channel_from_gd_to_framework = gravity.particles.new_channel_to(triple)
Etot_init = gravity.kinetic_energy + gravity.potential_energy
Etot_prev = Etot_init
gravity.particles.move_to_center()
time = 0.0 | t_end.unit
ts = t_stellar + time
ain, ein, aout, eout = get_orbital_elements_of_triple(triple)
print "Triple elements t=", time, \
"inner:", triple[0].mass, triple[1].mass, ain, ein, \
"outer:", triple[2].mass, aout, eout
dt_diag = t_end/float(nsteps)
t_diag = dt_diag
t = [time.value_in(units.Myr)]
smai = [ain/ain_0]
ecci = [ein/ein_0]
smao = [aout/aout_0]
ecco = [eout/eout_0]
ain = ain_0
def advance_stellar(ts, dt):
E0 = gravity.kinetic_energy + gravity.potential_energy
ts += dt
stellar.evolve_model(ts)
channel_from_stellar.copy_attributes(["mass"])
channel_from_framework_to_gd.copy_attributes(["mass"])
return ts, gravity.kinetic_energy + gravity.potential_energy - E0
def advance_gravity(tg, dt):
tg += dt
gravity.evolve_model(tg)
channel_from_gd_to_framework.copy()
return tg
while time < t_end:
Pin = orbital_period(ain, triple[0].mass+triple[1].mass)
dt = dtse_fac*Pin
dt *= random.random()
if scheme == 1:
ts, dE_se = advance_stellar(ts, dt)
time = advance_gravity(time, dt)
elif scheme == 2:
time = advance_gravity(time, dt)
ts, dE_se = advance_stellar(ts, dt)
else:
dE_se = zero
#ts, dE_se = advance_stellar(ts, dt/2)
time = advance_gravity(time, dt)
#ts, dE = advance_stellar(ts, dt/2)
#dE_se += dE
if time >= t_diag:
t_diag = time + dt_diag
Ekin = gravity.kinetic_energy
Epot = gravity.potential_energy
Etot = Ekin + Epot
dE = Etot_prev - Etot
Mtot = triple.mass.sum()
print "T=", time,
print "M=", Mtot, "(dM[SE]=", Mtot/Mtriple, ")",
print "E= ", Etot, "Q= ", Ekin/Epot,
print "dE=", (Etot_init-Etot)/Etot, "ddE=", (Etot_prev-Etot)/Etot,
print "(dE[SE]=", dE_se/Etot, ")"
Etot_init -= dE
Etot_prev = Etot
ain, ein, aout, eout = get_orbital_elements_of_triple(triple)
print "Triple elements t=", (4|units.Myr) + time, \
"inner:", triple[0].mass, triple[1].mass, ain, ein, \
"outer:", triple[2].mass, aout, eout
t.append(time.value_in(units.Myr))
smai.append(ain/ain_0)
ecci.append(ein/ein_0)
smao.append(aout/aout_0)
ecco.append(eout/eout_0)
if eout > 1.0 or aout <= zero:
print "Binary ionized or merged"
break
gravity.stop()
stellar.stop()
return t, smai, ecci, smao, ecco
def get_sun_and_planets(delta_JD=0.|units.day):
"""
eight planets of the Solar System
as for JD = 2457099.500000000 = A.D. 2015-Mar-18 00:00:00.0000 (CT)
http://ssd.jpl.nasa.gov/horizons.cgi
"""
planets = Particles(8)
# mass
planets.mass = [3.302e23,
48.685e23,
5.97219e24,
6.4185e23,
1898.13e24,
5.68319e26,
86.8103e24,
102.41e24] | units.kg
# eccentricity
planets_ecc = [2.056263501026885E-01,
6.756759719005901E-03,
1.715483324953308E-02,
9.347121362500883E-02,
4.877287772914470E-02,
5.429934603664216E-02,
4.911406962716518E-02,
8.494660388602767E-03]
# semi-major axis
planets_semi = [3.870989725156447E-01,
7.233252880006816E-01,
1.000816989613834E+00,
1.523624142457679E+00,
5.203543088590996E+00,
9.547316304899041E+00,
1.915982879739036E+01,
2.997013749028780E+01] | units.AU
# mean anomaly [degrees]
planets_mean_anomaly = [2.256667460183225E+02,
3.096834722926926E+02,
6.970055236286768E+01,
5.013506750245609E+01,
1.213203242081277E+02,
1.423311616732398E+02,
2.079860620353052E+02,
2.712246916734600E+02]
planets_mean_anomaly = numpy.array(planets_mean_anomaly) * pi_over_180
# inclination [IN degrees]
planets_inclination = [7.004026765179669E+00,
3.394480103844425E+00,
3.563477431351056E-03,
1.848403408106458E+00,
1.303457729562742E+00,
2.488017444885577E+00,
7.728000142736371E-01,
1.767720502209091E+00]
planets_inclination = numpy.array(planets_inclination) * pi_over_180
# Longitude of Ascending Node [OM degrees]
planets_longitude = [4.831163083479358E+01,
7.663982595051040E+01,
1.775515437672556E+02,
4.951282677064384E+01,
1.005036717671826E+02,
1.135683875842263E+02,
7.388411509910506E+01,
1.317497218434830E+02]
planets_longitude = numpy.array(planets_longitude) * pi_over_180
# Argument of Perihelion [W degrees]
planets_argument = [2.916964171964058E+01,
5.469102797401222E+01,
2.877495001117996E+02,
2.865420083537150E+02,
2.740725976811202E+02,
3.398666856578898E+02,
9.666856264946740E+01,
2.951871807292030E+02]
planets_argument = numpy.array(planets_argument) * pi_over_180
planets.name = ['Mercury',
'Venus',
'Earth',
'Mars',
'Jupiter',
'Satrun',
'Uranus',
'Neptune']
### to compare with JPL, mass of the Sun needs to be rescaled
#mg_nasa = 1.32712440018e20 | (units.m**3 / units.s**2)
#g_nasa = 6.67259e-11 | (units.m**3 / units.kg / units.s**2)
#ms = mg_nasa / g_nasa
sun = Particle()
sun.name = 'Sun'
#sun.mass = ms
sun.mass = 1.0 | units.MSun
sun.position = [0.,0.,0.] | units.AU
sun.velocity = [0.,0.,0.] | units.kms
# get the position and velocity vectors relative to sun
# by evolving in Kepler
for i,ecc_i in enumerate(planets_ecc):
r, v = get_position(sun.mass,
planets[i].mass,
planets_ecc[i],
planets_semi[i],
planets_mean_anomaly[i],
planets_inclination[i],
planets_longitude[i],
planets_argument[i],
delta_t=delta_JD)
planets[i].position = r
planets[i].velocity = v
return sun, planets
def xtest2(self):
print "Testing FallbackStellarEvolution: evolve tests"
# results of original code (not really check the numbers, tests have been relaxed because
# different timestepping of evolve_model and evolve_one_step)
results=dict()
results["10.0 MSun"]=dict(sse_age=3644655.52487 | units.yr,
sse_mass=9.99289747724 | units.MSun,
sse_rad=4.24764389443 | units.RSun,
sse_L=5993.72678228 | units.LSun,
evtwin_age=2999999.99732 | units.yr,
evtwin_mass=9.99832250931 | units.MSun,
evtwin_rad=4.1727904434 | units.RSun,
evtwin_L=6175.5214329 | units.LSun)
results["20.0 MSun"]=dict(sse_age= 2609167.84395| units.yr,
sse_mass= 19.8895071502| units.MSun,
sse_rad=7.07713598137| units.RSun,
sse_L=51232.436257| units.LSun,
evtwin_age= 2999999.99792| units.yr,
evtwin_mass=19.877338008| units.MSun,
evtwin_rad=6.77369109826| units.RSun,
evtwin_L= 54123.7589452| units.LSun)
results["40.0 MSun"]=dict(sse_age= 2627093.59096| units.yr,
sse_mass=38.3702723816| units.MSun,
sse_rad=13.6137662257 | units.RSun,
sse_L=303498.877464 | units.LSun,
evtwin_age= 2999999.99923| units.yr,
evtwin_mass=37.0862227121 | units.MSun,
evtwin_rad= 13.5982316053| units.RSun,
evtwin_L=320099.608846| units.LSun)
for m in [40.]| units.MSun:#,20.,10.] | units.MSun:
instance = FallbackStellarEvolution()
instance._main_se.parameters.max_age_stop_condition=3.| units.Myr
star = Particle(1)
star.mass = m
star = instance.particles.add_particle(star)
instance.commit_particles()
while instance.ActiveModel[star].__class__.__name__=="EVtwin":
instance.evolve_model()
print "%s\t%s\t%s\t%s\t%s\t%s" % (star.age, star.mass, star.radius,
star.luminosity, star.stellar_type, instance.ActiveModel[star].__class__.__name__)
self.assertAlmostRelativeEqual(results[str(m)]["sse_age"],instance._FBTimeseries[star].particles[0].SSEAgeAtSwitch,7)
self.assertAlmostRelativeEqual(results[str(m)]["sse_mass"],star.mass,7)
self.assertAlmostRelativeEqual(results[str(m)]["sse_rad"],star.radius,7)
self.assertAlmostRelativeEqual(results[str(m)]["sse_L"],star.luminosity,7)
star=instance._main_se.particles[0]
self.assertAlmostRelativeEqual(results[str(m)]["evtwin_age"],star.age,7)
self.assertAlmostRelativeEqual(results[str(m)]["evtwin_mass"],star.mass,2)
self.assertAlmostRelativeEqual(results[str(m)]["evtwin_rad"],star.radius,2)
self.assertAlmostRelativeEqual(results[str(m)]["evtwin_L"],star.luminosity,2)
print "%s\t%s\t%s\t%s\t%s" % (star.age, star.mass, star.radius,
star.luminosity, star.stellar_type)
instance.stop()
def test_softening(method=1):
code=Kepler(redirection="none")
code.set_method(method)
dt=float.fromhex("0x1.67b39e372f04dp+4")
mu=float.fromhex("0x1.fffffffffffdfp-3")
e2=float.fromhex("0x1.0000000000003p+0")
pos1=float.fromhex("0x1.1b76542265052p-1")
pos2=float.fromhex("0x1.0c4dbda42097cp-6")
pos3=float.fromhex("0x1.54fd66cd1e212p-3")
vel1=float.fromhex("0x1.d6ef43d58ca7ep-2")
vel2=float.fromhex("0x1.7a85379e59794p-2")
vel3=float.fromhex("-0x1.5421044d1acffp-1")
sun=Particle()
sun.mass=mu | nbody_system.mass
sun.x=0. | nbody_system.length
sun.y=0. | nbody_system.length
sun.z=0. | nbody_system.length
sun.vx=0. | nbody_system.speed
sun.vy=0. | nbody_system.speed
sun.vz=0. | nbody_system.speed
comet=Particle()
comet.mass= 0 | nbody_system.mass
comet.x=pos1 | nbody_system.length
comet.y=pos2 | nbody_system.length
comet.z=pos3 | nbody_system.length
comet.vx=vel1 | nbody_system.speed
comet.vy=vel2 | nbody_system.speed
comet.vz=vel3 | nbody_system.speed
tend=dt | nbody_system.time
print tend,mu
code.central_particle.add_particle(sun)
code.orbiters.add_particle(comet)
code.parameters.epsilon_squared = e2 | nbody_system.length**2
a0,eps0=elements(sun.mass,code.orbiters.x,code.orbiters.y,code.orbiters.z,
code.orbiters.vx,code.orbiters.vy,code.orbiters.vz,G=nbody_system.G)
print orbital_elements_from_binary(code.particles[0:2])
t1=time.time()
code.evolve_model(tend)
t2=time.time()
print orbital_elements_from_binary(code.particles[0:2])
print code.orbiters.position
a,eps=elements(sun.mass,code.orbiters.x,code.orbiters.y,code.orbiters.z,
code.orbiters.vx,code.orbiters.vy,code.orbiters.vz,G=nbody_system.G)
da=abs((a-a0)/a0)
deps=abs(eps-eps0)/eps0
print da,deps
print "time:",t2-t1
def t_linear(tend=1,N=100,method=0):
code=Kepler(redirection="none")
code.set_method(method)
mass=1. | nbody_system.mass
x=1. | nbody_system.length
vx=0 | nbody_system.speed
e=0.5*vx**2-nbody_system.G*mass/x
semimajor_axis=-nbody_system.G*mass/2/e
p=2*numpy.pi*(semimajor_axis**3/nbody_system.G/mass)**0.5
print semimajor_axis
print p
tend=tend*p
dt=p/N
sun=Particle()
sun.mass=mass
sun.x=0. | nbody_system.length
sun.y=0. | nbody_system.length
sun.z=0. | nbody_system.length
sun.vx=0. | nbody_system.speed
sun.vy=0. | nbody_system.speed
sun.vz=0. | nbody_system.speed
comet=Particle()
comet.mass= 0 | nbody_system.mass
comet.x=x
comet.y=0. | nbody_system.length
comet.z=0. | nbody_system.length
comet.vx=vx
comet.vy=0. | nbody_system.speed
comet.vz=0. | nbody_system.speed
code.central_particle.add_particle(sun)
code.orbiters.add_particle(comet)
a0,eps0=elements(sun.mass,code.orbiters.x,code.orbiters.y,code.orbiters.z,
code.orbiters.vx,code.orbiters.vy,code.orbiters.vz,G=nbody_system.G)
print orbital_elements_from_binary(code.particles[0:2])
#pyplot.ion()
#f=pyplot.figure(figsize=(8,6))
#pyplot.show()
tnow=0*tend
time=[]
xs=[]
while tnow<tend:
tnow+=dt
print tnow,int(tnow/dt)
code.evolve_model(tnow)
#f.clf()
time.append(tnow/tend)
xs.append(code.orbiters.x[0].number)
#pyplot.plot(time,xs,"r+")
#pyplot.xlim(-0.1,1.1)
#pyplot.ylim(-1.1,3.1)
#pyplot.draw()
print orbital_elements_from_binary(code.particles[0:2])
print code.orbiters.position
a,eps=elements(sun.mass,code.orbiters.x,code.orbiters.y,code.orbiters.z,
code.orbiters.vx,code.orbiters.vy,code.orbiters.vz,G=nbody_system.G)
da=abs((a-a0)/a0)
deps=abs(eps-eps0)/eps0
print da,deps
raw_input()
def evolve_triple_with_wind(M1, M2, M3, Pora, Pin_0, ain_0, aout_0,
ein_0, eout_0, t_end, nsteps, scheme, integrator,
t_stellar, dt_se, dtse_fac, interp):
import random
from amuse.ext.solarsystem import get_position
numpy.random.seed(42)
print "Initial masses:", M1, M2, M3
triple = Particles(3)
triple[0].mass = M1
triple[1].mass = M2
triple[2].mass = M3
stellar = SeBa()
stellar.particles.add_particles(triple)
channel_from_stellar = stellar.particles.new_channel_to(triple)
# Evolve to t_stellar.
stellar.evolve_model(t_stellar)
channel_from_stellar.copy_attributes(["mass"])
M1 = triple[0].mass
M2 = triple[1].mass
M3 = triple[2].mass
print "t=", stellar.model_time.in_(units.Myr)
print "M=", stellar.particles.mass.in_(units.MSun)
print "R=", stellar.particles.radius.in_(units.RSun)
print "L=", stellar.particles.luminosity.in_(units.LSun)
print "T=", stellar.particles.temperature.in_(units.K)
print "Mdot=", \
-stellar.particles.wind_mass_loss_rate.in_(units.MSun/units.yr)
# Start the dynamics.
# Inner binary:
tmp_stars = Particles(2)
tmp_stars[0].mass = M1
tmp_stars[1].mass = M2
if Pora == 1:
ain_0 = semimajor_axis(Pin_0, M1+M2)
else:
Pin_0 = orbital_period(ain_0, M1+M2)
print 'Pin =', Pin_0
print 'ain_0 =', ain_0
print 'M1+M2 =', M1+M2
print 'Pin_0 =', Pin_0.value_in(units.day), '[day]'
#print 'semi:', semimajor_axis(Pin_0, M1+M2).value_in(units.AU), 'AU'
#print 'period:', orbital_period(ain_0, M1+M2).value_in(units.day), '[day]'
dt_init = 0.01*Pin_0
ma = 180
inc = 60
aop = 180
lon = 0
r,v = get_position(M1, M2, ein_0, ain_0, ma, inc, aop, lon, dt_init)
tmp_stars[1].position = r
tmp_stars[1].velocity = v
tmp_stars.move_to_center()
# Outer binary:
r,v = get_position(M1+M2, M3, eout_0, aout_0, 0, 0, 0, 0, dt_init)
tertiary = Particle()
tertiary.mass = M3
tertiary.position = r
tertiary.velocity = v
tmp_stars.add_particle(tertiary)
tmp_stars.move_to_center()
triple.position = tmp_stars.position
triple.velocity = tmp_stars.velocity
Mtriple = triple.mass.sum()
Pout = orbital_period(aout_0, Mtriple)
print "T=", stellar.model_time.in_(units.Myr)
print "M=", stellar.particles.mass.in_(units.MSun)
print "Pout=", Pout.in_(units.Myr)
print 'tK =', ((M1+M2)/M3)*Pout**2*(1-eout_0**2)**1.5/Pin_0
converter = nbody_system.nbody_to_si(triple.mass.sum(), aout_0)
if integrator == 0:
gravity = Hermite(converter)
gravity.parameters.timestep_parameter = 0.01
elif integrator == 1:
gravity = SmallN(converter)
gravity.parameters.timestep_parameter = 0.01
gravity.parameters.full_unperturbed = 0
elif integrator == 2:
gravity = Huayno(converter)
gravity.parameters.inttype_parameter = 20
gravity.parameters.timestep = (1./256)*Pin_0
else:
gravity = symple(converter)
gravity.parameters.integrator = 10
#gravity.parameters.timestep_parameter = 0.
gravity.parameters.timestep = (1./128)*Pin_0
print gravity.parameters
gravity.particles.add_particles(triple)
channel_from_framework_to_gd = triple.new_channel_to(gravity.particles)
channel_from_gd_to_framework = gravity.particles.new_channel_to(triple)
Etot_init = gravity.kinetic_energy + gravity.potential_energy
Etot_prev = Etot_init
gravity.particles.move_to_center()
# Note: time = t_diag = 0 at the start of the dynamical integration.
dt_diag = t_end/float(nsteps)
t_diag = dt_diag
time = 0.0 | t_end.unit
t_se = t_stellar + time
print 't_end =', t_end
print 'dt_diag =', dt_diag
ain, ein, aout, eout = get_orbital_elements_of_triple(triple)
print "Triple elements t=", time, \
"inner:", triple[0].mass, triple[1].mass, ain, ein, \
"outer:", triple[2].mass, aout, eout
t = [time.value_in(units.Myr)]
Mtot = triple.mass.sum()
mtot = [Mtot.value_in(units.MSun)]
smai = [ain/ain_0]
ecci = [ein/ein_0]
smao = [aout/aout_0]
ecco = [eout/eout_0]
if interp:
# Create arrays of stellar times and masses for interpolation.
times = [time]
masses = [triple.mass.copy()]
while time < t_end:
time += dt_se
stellar.evolve_model(t_stellar+time)
channel_from_stellar.copy_attributes(["mass"])
times.append(time)
masses.append(triple.mass.copy())
time = 0.0 | t_end.unit
print '\ntimes:', times, '\n'
# Evolve the system.
def advance_stellar(t_se, dt):
E0 = gravity.kinetic_energy + gravity.potential_energy
t_se += dt
if interp:
t = t_se-t_stellar
i = int(t/dt_se)
mass = masses[i] + (t-times[i])*(masses[i+1]-masses[i])/dt_se
triple.mass = mass
#print 't_se =', t_se, 'masses =', mass
else:
stellar.evolve_model(t_se)
channel_from_stellar.copy_attributes(["mass"])
channel_from_framework_to_gd.copy_attributes(["mass"])
return t_se, gravity.kinetic_energy + gravity.potential_energy - E0
def advance_gravity(tg, dt):
tg += dt
gravity.evolve_model(tg)
channel_from_gd_to_framework.copy()
return tg
while time < t_end:
if scheme == 1:
# Advance to the next diagnostic time.
dE_se = zero
dt = t_diag - time
if dt > 0|dt.unit:
time = advance_gravity(time, dt)
elif scheme == 2:
# Derive dt from Pin using dtse_fac.
dt = dtse_fac*Pin_0
if time + dt > t_diag: dt = t_diag - time
if dt > 0|dt.unit:
t_se, dE_se = advance_stellar(t_se, dt)
time = advance_gravity(time, dt)
elif scheme == 3:
# Derive dt from Pin using dtse_fac.
dt = dtse_fac*Pin_0
if time + dt > t_diag: dt = t_diag - time
if dt > 0|dt.unit:
time = advance_gravity(time, dt)
t_se, dE_se = advance_stellar(t_se, dt)
elif scheme == 4:
# Derive dt from Pin using dtse_fac.
dt = dtse_fac*Pin_0
if time + dt > t_diag: dt = t_diag - time
if dt > 0|dt.unit:
t_se, dE_se = advance_stellar(t_se, 0.5*dt)
time = advance_gravity(time, dt)
t_se, dE_se2 = advance_stellar(t_se, 0.5*dt)
dE_se += dE_se2
elif scheme == 5:
# Use the specified dt_se.
dE_se = zero
dt = dt_se
if time + dt > t_diag: dt = t_diag - time
if dt > 0|dt.unit:
# For use with symple only: set up average mass loss.
channel_from_stellar.copy_attributes(["mass"])
m0 = triple.mass.copy()
stellar.evolve_model(t_se+dt)
channel_from_stellar.copy_attributes(["mass"])
t_se = stellar.model_time
m1 = triple.mass
dmdt = (m1-m0)/dt
for i in range(len(dmdt)):
gravity.set_dmdt(i, dmdt[i])
time = advance_gravity(time, dt)
else:
print 'unknown option'
sys.exit(0)
if time >= t_diag:
t_diag = time + dt_diag
Ekin = gravity.kinetic_energy
Epot = gravity.potential_energy
Etot = Ekin + Epot
dE = Etot_prev - Etot
Mtot = triple.mass.sum()
print "T=", time,
print "M=", Mtot, "(dM[SE]=", Mtot/Mtriple, ")",
print "E= ", Etot, "Q= ", Ekin/Epot,
print "dE=", (Etot_init-Etot)/Etot, "ddE=", (Etot_prev-Etot)/Etot,
print "(dE[SE]=", dE_se/Etot, ")"
Etot_init -= dE
Etot_prev = Etot
ain, ein, aout, eout = get_orbital_elements_of_triple(triple)
print "Triple elements t=", t_stellar + time, \
"inner:", triple[0].mass, triple[1].mass, ain, ein, \
"outer:", triple[2].mass, aout, eout
t.append(time.value_in(units.yr))
mtot.append(Mtot.value_in(units.MSun))
smai.append(ain/ain_0)
ecci.append(ein/ein_0)
smao.append(aout/aout_0)
ecco.append(eout/eout_0)
if eout > 1 or aout <= zero:
print "Binary ionized or merged"
break
gravity.stop()
stellar.stop()
return t, mtot, smai, ecci, smao, ecco
def main(number_of_grid_cells=15, min_convergence=20):
inner_radius = 30.0e17 | units.cm
outer_radius = 95.0e17 | units.cm
hydrogen_density = 100 | units.cm ** -3
star = Particle()
star.position = [0.0, 0.0, 0.0] | units.AU
star.temperature = 20000 | units.K
star.luminosity = 600.5 | 1e37 * units.erg * (units.s**-1)
grid = make_grid(
number_of_grid_cells=number_of_grid_cells,
length=outer_radius,
constant_hydrogen_density=hydrogen_density,
inner_radius=inner_radius,
outer_radius=outer_radius
)
radiative_transfer = Mocassin(number_of_workers=2) # , debugger = "xterm")
radiative_transfer.set_input_directory(
radiative_transfer.get_default_input_directory())
radiative_transfer.set_mocassin_output_directory(
radiative_transfer.output_directory + os.sep)
radiative_transfer.initialize_code()
radiative_transfer.set_symmetricXYZ(True)
radiative_transfer.parameters.length_x = outer_radius
radiative_transfer.parameters.length_y = outer_radius
radiative_transfer.parameters.length_z = outer_radius
radiative_transfer.parameters.mesh_size = [
number_of_grid_cells, number_of_grid_cells, number_of_grid_cells]
setup_abundancies(radiative_transfer)
radiative_transfer.parameters.initial_nebular_temperature = 6000.0 | units.K
radiative_transfer.parameters.high_limit_of_the_frequency_mesh = 15 | mocassin_rydberg_unit
radiative_transfer.parameters.low_limit_of_the_frequency_mesh = 1.001e-5 | mocassin_rydberg_unit
radiative_transfer.parameters.total_number_of_photons = 10000000
radiative_transfer.parameters.total_number_of_points_in_frequency_mesh = 600
radiative_transfer.parameters.convergence_limit = 0.09
radiative_transfer.parameters.number_of_ionisation_stages = 6
radiative_transfer.commit_parameters()
radiative_transfer.grid.hydrogen_density = grid.hydrogen_density
radiative_transfer.commit_grid()
radiative_transfer.particles.add_particle(star)
radiative_transfer.commit_particles()
max_number_of_photons = radiative_transfer.parameters.total_number_of_photons * 100
previous_percentage_converged = 0.0
for i in range(20):
radiative_transfer.step()
percentage_converged = radiative_transfer.get_percentage_converged()
print(
"percentage converged :", percentage_converged,
", step :", i,
", photons:",
radiative_transfer.parameters.total_number_of_photons)
if percentage_converged >= min_convergence:
break
if previous_percentage_converged > 5 and percentage_converged < 95:
convergence_increase = (
percentage_converged - previous_percentage_converged
) / previous_percentage_converged
if (
convergence_increase < 0.2
and radiative_transfer.parameters.total_number_of_photons < max_number_of_photons
):
radiative_transfer.parameters.total_number_of_photons *= 2
previous_percentage_converged = percentage_converged
grid.electron_temperature = radiative_transfer.grid.electron_temperature
radius = grid.radius.flatten()
electron_temperature = grid.electron_temperature.flatten()
selection = electron_temperature > 0 | units.K
plot_temperature_line(radius[selection], electron_temperature[selection])
write_set_to_file(grid, 'h2region.h5', 'amuse')
