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352 lines (302 loc) · 9.91 KB
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"""
Simulate the radiative and hydrodynamial evolution of a disk with a bump
around a single star
"""
import argparse
from amuse.units import units, nbody_system, constants
from amuse.datamodel import Particles
from amuse.io import write_set_to_file
from amuse.community.simplex.interface import SimpleXSplitSet
from amuse.community.gadget2 import Gadget2
from amuse.community.seba import Seba
from amuse.ext.protodisk import ProtoPlanetaryDisk
from amuse.ic.gasplummer import new_plummer_gas_model
from amuse.support.console import set_printing_strategy
set_printing_strategy(
"custom",
preferred_units=[units.MSun, units.au, units.Myr],
precision=12,
prefix="",
separator=" [",
suffix="]",
)
def mu(X=None, Y=0.25, Z=0.02, x_ion=0.1):
"""
Compute the mean molecular weight in kg (the average weight of
particles in a gas) X, Y, and Z are the mass fractions of
Hydrogen, of Helium, and of metals, respectively. x_ion is the
ionisation fraction (0 < x_ion < 1), 1 means fully ionised.
"""
if X is None:
X = 1.0 - Y - Z
elif abs(X + Y + Z - 1.0) > 1e-6:
raise Exception(
"Error in calculating mu: mass " + "fractions do not sum to 1.0"
)
return constants.proton_mass / (
X * (1.0 + x_ion) + Y * (1.0 + 2.0 * x_ion) / 4.0 + Z * x_ion / 2.0
)
class RadHydro:
def __init__(self, rad, hydro, star, disk):
self.time = 0 | units.day
self.star = star
self.disk = disk
disk.r2 = disk.x**2 + disk.y**2
disk = disk.sorted_by_attributes("r2")
radius_max = disk.r2.max().sqrt()
print("MaxR=", radius_max.in_(units.au))
self.hydro = hydro(
nbody_system.nbody_to_si(self.disk.mass.sum(), radius_max),
number_of_workers=4,
)
self.hydro.parameters.epsilon_squared = (10 | units.au) ** 2
self.hydro.gas_particles.add_particles(self.disk)
self.hydro.gas_particles.new_channel_to(self.disk)
self.hydro.dm_particles.add_particles(self.star)
self.hydro.dm_particles.new_channel_to(self.star)
self.hydro_to_star = self.hydro.dm_particles.new_channel_to(self.star)
self.hydro_to_disk = self.hydro.gas_particles.new_channel_to(self.disk)
self.star_to_hydro = self.star.new_channel_to(self.hydro.dm_particles)
self.disk_to_hydro = self.disk.new_channel_to(self.hydro.gas_particles)
self.hydro.evolve_model(1 | units.s)
self.hydro_to_star.copy()
self.hydro_to_disk.copy()
self.rad = rad()
for si in self.star:
if si.mass >= 5 | units.MSun:
self.rad.src_particles.add_particle(si)
self.rad.gas_particles.add_particles(self.disk)
self.rad.parameters.box_size = 2.01 * radius_max
self.rad.parameters.timestep = 1 | units.day
self.rad.set_source_Teff(star.temperature)
self.rad_to_disk = self.rad.gas_particles.new_channel_to(
self.disk,
attributes=["xion", "u"],
)
self.star_to_rad = self.star.new_channel_to(
self.rad.src_particles,
attributes=["x", "y", "z"],
)
self.disk_to_rad = self.disk.new_channel_to(
self.rad.gas_particles,
attributes=["x", "y", "z"],
)
# self.rad_to_disk.copy()
# self.star_to_rad.copy()
# self.disk_to_rad.copy()
self.rad.stop()
self.index = 0
def write_file(self):
self.index += 1
filename = f"hydro_disk_with_bump_i{self.index:04}.amuse"
write_set_to_file(self.star, filename, overwrite_file=True)
write_set_to_file(self.disk, filename, append_to_file=True)
def evolve_model(self, model_time):
dt = model_time - self.time
self.old_time = self.time
self.time += dt / 2.0
# self.disk_to_rad.copy()
# self.star_to_rad.copy()
# self.rad.evolve_model(self.time)
# self.rad_to_disk.copy()
self.time += dt / 2.0
self.disk_to_hydro.copy()
self.star_to_hydro.copy()
self.hydro.evolve_model(self.time)
self.hydro_to_disk.copy()
self.hydro_to_star.copy()
print("RT done at time:", self.time.in_(units.day))
def print_diagnostics(self):
umin = self.disk.u.min()
umean = self.disk.u.mean()
umax = self.disk.u.max()
Tmin = mu() / constants.kB * umax
Tmean = mu() / constants.kB * umean
Tmax = mu() / constants.kB * umin
print("Time=", self.time.in_(units.day))
print(
f"Ionization: {self.disk.xion.min()} {self.disk.xion.mean()}"
f"self.disk.xion.max()"
)
print("Intenal energy:", umin, umean, umax)
print("Temperature:", Tmin, Tmean, Tmax)
print(
"Density:",
self.disk.density.min().in_(units.amu / units.cm**3),
self.disk.density.mean().in_(units.amu / units.cm**3),
self.disk.density.max().in_(units.amu / units.cm**3),
)
print("scaleheight:", abs(self.disk.z.value_in(units.au)).mean())
def stop(self):
self.hydro.stop()
# #BOOKLISTSTART1# #
def new_disk_with_bump(
mass_star=10 | units.MSun,
n_disk=100,
mass_disk=1.0 | units.MSun,
radius_min=1.0 | units.au,
radius_max=100.0 | units.au,
mass_bump=0.1 | units.MSun,
radius_bump=5.0 | units.au,
dist_bump=10 | units.au,
):
converter = nbody_system.nbody_to_si(mass_star, radius_min)
disk = ProtoPlanetaryDisk(
n_disk,
convert_nbody=converter,
densitypower=1.5,
Rmin=1,
Rmax=radius_max / radius_min,
q_out=1.0,
discfraction=mass_disk / mass_star,
).result
com = disk.center_of_mass()
# determine bump's local velocity
inner_particles = disk.select(
lambda r: (com - r).length() < dist_bump, ["position"]
)
M_inner = mass_star + inner_particles.mass.sum()
v_circ = (
(constants.G * M_inner * (2.0 / dist_bump - 1.0 / dist_bump)).sqrt().value_in(units.kms)
)
# initialize bump
Nbump = int(n_disk * mass_bump / mass_disk)
bump = new_plummer_gas_model(
Nbump, convert_nbody=nbody_system.nbody_to_si(mass_bump, radius_bump)
)
bump.x += dist_bump
bump.velocity += [0, v_circ, 0] | units.kms
disk.add_particles(bump)
disk.move_to_center()
return disk
# #BOOKLISTSTOP1# #
def evolve_star(mass_star, tstar):
stars = Particles(1)
stars = Particles(2)
stars[0].mass = mass_star
stars[1].mass = 0.1 * mass_star
stellar = Seba()
stellar.particles.add_particle(stars)
stellar.evolve_model(tstar)
stars.mass = stellar.particles.mass
stars.position = (0, 0, 0) | units.au
stars.velocity = (0, 0, 0) | units.kms
stars.luminosity = stellar.particles.luminosity / (20.0 | units.eV)
stars.temperature = stellar.particles.temperature
stars.flux = stars.luminosity
stars.rho = 1.0 | (units.g / units.cm**3)
stars.xion = 0.0 # ionization_fraction
stars.u = (9.0 | units.kms) ** 2 # internal_energy
print(stars)
if len(stars) > 1:
stars[1].x = 50 | units.au
vc = 1.0 * (constants.G * stars.mass.sum() / (100.0 | units.au)).sqrt()
stars[1].vy += vc
stellar.stop()
return stars
def hydro_disk_with_bump(
mass_star=10 | units.MSun,
n_disk=100,
mass_disk=1.0 | units.MSun,
radius_min=1.0 | units.au,
radius_max=100.0 | units.au,
mass_bump=0.1 | units.MSun,
radius_bump=5.0 | units.au,
dist_bump=10 | units.au,
time_end=10 | units.yr,
n_steps=10,
):
star = evolve_star(mass_star, time_end)
disk = new_disk_with_bump(
star[0].mass,
n_disk,
mass_disk,
radius_min,
radius_max,
mass_bump,
radius_bump,
dist_bump,
)
radhydro = RadHydro(SimpleXSplitSet, Gadget2, star, disk)
radhydro.write_file()
time_step = time_end / float(n_steps)
print(f"time_step={time_step.in_(units.day)}")
time_model = 0 | units.day
while time_model < time_end:
time_model += time_step
radhydro.evolve_model(time_model)
radhydro.print_diagnostics()
radhydro.write_file()
radhydro.stop()
def new_argument_parser():
parser = argparse.ArgumentParser(
formatter_class=argparse.ArgumentDefaultsHelpFormatter,
)
parser.add_argument(
"-N",
"--n_disk",
type=int,
default=10000,
help="number of particles in disk",
)
parser.add_argument(
"-t",
"--time_end",
type=units.yr,
default=2000.0 | units.yr,
help="radiation time",
)
parser.add_argument(
"-n", "--n_steps", type=int, default=100, help="number of steps"
)
parser.add_argument(
"--mass_star",
type=units.MSun,
default=10 | units.MSun,
help="Mass of the central star",
)
parser.add_argument(
"--mass_disk",
type=units.MSun,
default=1 | units.MSun,
help="Mass of the disk",
)
parser.add_argument(
"-r",
"--radius_min",
type=units.au,
default=10 | units.au,
help="inner disk radius",
)
parser.add_argument(
"-R",
"--radius_max",
type=units.au,
default=100 | units.au,
help="outer disk radius",
)
parser.add_argument(
"--mass_bump",
type=units.MSun,
default=0.5 | units.MSun,
help="bump mass",
)
parser.add_argument(
"--radius_bump",
type=units.au,
default=5 | units.au,
help="bump radius",
)
parser.add_argument(
"-a",
"--dist_bump",
type=units.au,
default=50 | units.au,
help="distance of bump from star",
)
return parser
def main():
arguments = new_argument_parser().parse_args()
hydro_disk_with_bump(**arguments.__dict__)
if __name__ == "__main__":
main()