def displace_galaxy(galaxy, rotation_mat, translation_vector, radial_velocity,
transverse_velocity):
widgets = [
'Adjusting relative velocities and orientations: ',
pbwg.AnimatedMarker(),
pbwg.EndMsg()
]
with pbar.ProgressBar(widgets=widgets, fd=sys.stdout) as progress:
displaced_galaxy = Particles(len(galaxy))
displaced_galaxy.mass = galaxy.mass
displaced_galaxy.position = galaxy.position
displaced_galaxy.velocity = galaxy.velocity
for body in displaced_galaxy:
body.position = ([
body.x.value_in(units.kpc),
body.y.value_in(units.kpc),
body.z.value_in(units.kpc)
] @ rotation_mat) | units.kpc
body.velocity = ([
body.vx.value_in(units.kms),
body.vy.value_in(units.kms),
body.vz.value_in(units.kms)
] @ rotation_mat) | units.kms
displaced_galaxy.position += translation_vector
displaced_galaxy.velocity += radial_velocity
displaced_galaxy.velocity += transverse_velocity
return displaced_galaxy
def load_galaxy_data(glxy_name, test=False, loaded='last'):
if test == True:
parent = __TEST_MODEL_DIR__
tf = '_test_'
elif test == False:
parent = __FULL_MODEL_DIR__
tf = '_full_'
dirnames_list = []
mw_dirnames_list = []
m31_dirnames_list = []
for (dirpath, dirnames, filenames) in os.walk(parent):
dirnames_list.extend(dirnames)
break
for dirname in dirnames_list:
if dirname[0:2] == 'mw':
mw_dirnames_list.append(dirname)
elif dirname[0:3] == 'm31':
m31_dirnames_list.append(dirname)
if glxy_name == 'mw':
current_dirlist = mw_dirnames_list
elif glxy_name == 'm31_not_displaced':
current_dirlist = m31_dirnames_list
if loaded == 'last':
try:
glxy_dir = sorted(current_dirlist)[-1]
except:
try:
glxy_dir = sorted(current_dirlist)[0]
except:
glxy_dir = ''
else:
for dirname in current_dirlist:
if loaded == dirname:
glxy_dir = dirname
break
glxy_data_name = glxy_dir
glxy_data_dir = parent + glxy_dir + '/'
glxy_data_path = glxy_data_dir + glxy_data_name
if os.path.exists(glxy_data_path):
widgets = [
'Found galaxy data in {}, loading: '.format(glxy_data_dir),
pbwg.AnimatedMarker(),
pbwg.EndMsg()
]
with pbar.ProgressBar(widgets=widgets, fd=sys.stdout) as progress:
glxy = read_set_from_file(glxy_data_path, "hdf5")
else:
raise ValueError('No galaxy model found')
return glxy, glxy_data_dir
def make_galaxy(n_halo, converter, glxy_name, test=False, **kwargs):
widgets = [
'Building {} galaxy: '.format(glxy_name),
pbwg.AnimatedMarker(), ' ',
pbwg.Timer(),
pbwg.EndMsg()
]
with pbar.ProgressBar(widgets=widgets, fd=sys.stdout) as progress:
galaxy = new_galactics_model(n_halo, converter, **kwargs)
out_path, current_model, tf = create_output_dir(glxy_name, test=test)
galaxy_data_path = out_path + current_model
widgets = [
'Saving {} galaxy data in {}: '.format(glxy_name, out_path),
pbwg.AnimatedMarker(),
pbwg.EndMsg()
]
with pbar.ProgressBar(widgets=widgets, fd=sys.stdout) as progress:
write_set_to_file(galaxy, galaxy_data_path, 'hdf5')
return galaxy, out_path
#disk_central_radial_velocity_dispersion=m31_param['disk_central_radial_velocity_dispersion'],
#bulge paramaters
#bulge_scale_radius = glxy_param['bulge_scale_radius'],
bulge_number_of_particles=m31_parameters['bulge_number_of_particles'])
else:
#mw, _ = gal.load_galaxy_data('mw', test=TEST)
#m31_not_displaced, _ = gal.load_galaxy_data('m31_not_displaced', test=TEST)
mw_data_dir = 'used_models/mw_test_2020-11-10-0001/'
m31_data_dir = 'used_models/m31_not_displaced_test_2020-11-10-0001/'
widgets = [
'Found galaxy data in {}, loading: '.format(mw_data_dir),
pbwg.AnimatedMarker(),
pbwg.EndMsg()
]
with pbar.ProgressBar(widgets=widgets, fd=sys.stdout) as progress:
mw = read_set_from_file(mw_data_dir + 'mw_test_2020-11-10-0001',
"hdf5")
widgets = [
'Found galaxy data in {}, loading: '.format(m31_data_dir),
pbwg.AnimatedMarker(),
pbwg.EndMsg()
]
with pbar.ProgressBar(widgets=widgets, fd=sys.stdout) as progress:
m31_not_displaced = read_set_from_file(
m31_data_dir + 'm31_not_displaced_test_2020-11-10-0001', "hdf5")
mw_mass = da.galaxy_total_mass(mw)
m31_mass = da.galaxy_total_mass(m31_not_displaced)
def simulate_merger(galaxy1,
galaxy2,
n_halo,
n_disk,
n_bulge,
t_end,
converter,
solver,
initial_conditions_dict,
interval=0.5 | units.Myr,
animation=False,
snapshot=False,
snap_freq=1000,
sol_system=None,
igm_gas_particles=None,
igm_dm_particles=None,
box_grid=0):
#sets up the gravity solver
dynamics_code = solver(converter, number_of_workers=4)
dynamics_code.parameters.epsilon_squared = (100 | units.parsec)**2
dynamics_code.timestep = interval
#if igm_gas_particles != None and igm_dm_particles != None:
#dynamics_code.parameters.self_gravity_flag = True
#computes coordinate difference between mw center of mass and solar system and moves it
if sol_system != None:
deltapos = galaxy1.center_of_mass() - sol_system.position
sol_system.position = galaxy1.center_of_mass() - deltapos
#uploads the particles into the gravity solver
set1 = dynamics_code.dm_particles.add_particles(galaxy1)
set2 = dynamics_code.dm_particles.add_particles(galaxy2)
if sol_system != None:
set5 = dynamics_code.dm_particles.add_particles(sol_system)
else:
set5 = None
#moves system to center of mass
dynamics_code.particles.move_to_center()
#uploads igm particles
if igm_gas_particles != None and igm_dm_particles != None:
set3 = dynamics_code.dm_particles.add_particles(igm_gas_particles)
set4 = dynamics_code.dm_particles.add_particles(igm_dm_particles)
#creates channels
mw_channel = dynamics_code.dm_particles.new_channel_to(set1)
m31_channel = dynamics_code.dm_particles.new_channel_to(set2)
if igm_gas_particles != None and igm_dm_particles != None:
igm_gas_channel = dynamics_code.dm_particles.new_channel_to(set3)
igm_dm_channel = dynamics_code.dm_particles.new_channel_to(set4)
if sol_system != None:
solar_channel = dynamics_code.dm_particles.new_channel_to(set5)
#checks if the solver is Fi
if isinstance(dynamics_code, Fi):
dynamics_code.parameters.timestep = interval
dynamics_code.update_particle_set()
#creates output dirs
out_dir, current_merger = create_merger_output_dir()
diskbulge_merger_dir, contour_merger_dir, zoom_merger_dir, mw_zoom_dir, histogram_dir, igm_dir = create_merger_subdirs(
out_dir)
#initializes animations
if animation:
animation_number = 1
last_anim_time = 0 | units.Myr
db_writer = GalaxyAnimWriter(current_merger + '_diskbulge_anim' +
str(animation_number).zfill(2))
cr_writer = GalaxyAnimWriter(current_merger + '_contour_anim' +
str(animation_number).zfill(2))
zm_writer = GalaxyAnimWriter(current_merger + '_zoom_anim' +
str(animation_number).zfill(2))
else:
db_writer = None
cr_writer = None
zm_writer = None
#initializes snapshots
start_zoom_plot = False
last_snap_number = 0
last_plot_time = 0 | units.Myr
current_time = 0 | units.Myr
_a, _b = plt_anim_wrapper(set1,
set2,
n_disk,
n_bulge,
last_snap_number,
current_time,
last_plot_time,
'MW M31 merger',
diskbulge_merger_dir,
contour_merger_dir,
zoom_merger_dir,
mw_zoom_dir,
'mw_m31',
t_end,
100000,
particles=set5,
animation=animation,
snapshot=snapshot,
diskbulge_writer=db_writer,
contour_writer=cr_writer,
zoom_writer=zm_writer,
zoom=start_zoom_plot)
#plots starting IGM
#if igm_gas_particles != None and igm_dm_particles != None:
# plot_igm(set3|set4, 500, Lg, igm_dir, 'IGM_density_t0')
#initializes separation logs and solar system positions
merger_dict = initial_conditions_dict
merger_dict = update_merger_dict(merger_dict,
current_time,
set1,
set2,
solar=set5)
#initializes progressbar
current_iter = 0
t_end_in_Myr = t_end.as_quantity_in(units.Myr)
total_iter = int(t_end_in_Myr / interval) + 1
widgets = [
'Step ',
pbwg.SimpleProgress(), ' ',
pbwg.Bar(marker='=', tip='>', left='[', right=']', fill=' '),
pbwg.Percentage(), ' - ',
pbwg.ETA('ETA'),
pbwg.EndMsg()
]
progress = pbar.ProgressBar(widgets=widgets,
maxval=total_iter,
fd=sys.stdout).start()
while dynamics_code.model_time < t_end:
#evolves model
dynamics_code.evolve_model(dynamics_code.model_time + interval)
if isinstance(dynamics_code, Fi):
dynamics_code.update_particle_set()
#copies channels
mw_channel.copy()
m31_channel.copy()
if sol_system != None:
solar_channel.copy()
if igm_gas_particles != None and igm_dm_particles != None:
igm_gas_channel.copy()
igm_dm_channel.copy()
#current time of the solver
current_time = dynamics_code.model_time
#makes plots
if last_plot_time.value_in(units.Myr) > 3000:
start_zoom_plot = True
last_plot_time, last_snap_number = plt_anim_wrapper(
set1,
set2,
n_disk,
n_bulge,
last_snap_number,
current_time,
last_plot_time,
'MW M31 merger',
diskbulge_merger_dir,
contour_merger_dir,
zoom_merger_dir,
mw_zoom_dir,
'mw_m31',
t_end,
snap_freq,
particles=set5,
animation=animation,
snapshot=snapshot,
diskbulge_writer=db_writer,
contour_writer=cr_writer,
zoom_writer=zm_writer,
zoom=start_zoom_plot)
#updates separation logs and solar system positions
merger_dict = update_merger_dict(merger_dict,
current_time,
set1,
set2,
solar=set5)
#manages animations
if animation:
if close_animation(dynamics_code.model_time, last_anim_time):
db_writer.close()
cr_writer.close()
zm_writer.close()
animation_number += 1
last_anim_time = dynamics_code.model_time
db_writer = GalaxyAnimWriter(current_merger +
'_diskbulge_anim' +
str(animation_number).zfill(2))
cr_writer = GalaxyAnimWriter(current_merger + '_contour_anim' +
str(animation_number).zfill(2))
zm_writer = GalaxyAnimWriter(current_merger + '_zoom_anim' +
str(animation_number).zfill(2))
#updates progressbar
current_iter += 1
progress.update(current_iter)
#closes progressbar
progress.finish()
#plots final IGM
#if igm_gas_particles != None and igm_dm_particles != None:
# plot_igm(igm_gas_particles|igm_dm_particles, 500, Lg, igm_dir, 'IGM_density_tfinal')
#kills solver
dynamics_code.stop()
#checks if every dict key list has the same numer of elements
merger_dict = pad_dict_list(merger_dict, -1)
#saves merger logs into dataframe
df_merger = pd.DataFrame(merger_dict)
df_merger.to_csv('{}merger_logs.csv'.format(out_dir), index=False)
#closes animations
if animation:
db_writer.close()
cr_writer.close()
zm_writer.close()
def mw_and_stars(galaxy1,
stars,
converter,
n_disk,
n_bulge,
t_end,
star_solver,
interval=1 | units.Myr,
snapshot=False,
snap_freq=300):
leapfrog = True
if isinstance(star_solver, (BHTree)):
leapfrog = False
galaxy_dynamics_code = Fi(converter,
redirection='none',
number_of_workers=1)
galaxy_dynamics_code.parameters.epsilon_squared = (100 | units.parsec)**2
set1 = galaxy_dynamics_code.dm_particles.add_particles(galaxy1)
mw_channel = galaxy_dynamics_code.particles.new_channel_to(set1)
galaxy_dynamics_code.particles.move_to_center()
#mw_channel.update()
halo1, disk1, bulge1 = galaxy_structures(set1, n_disk, n_bulge)
if leapfrog:
galaxy_dynamics_code.parameters.timestep = 0.5 | units.Myr
solver = galaxy_dynamics_code
else:
star_converter = nbody_system.nbody_to_si(stars.mass.sum(),
stars.position.length())
star_dynamics_code = star_solver(star_converter)
star_dynamics_code.particles.add_particles(stars)
ch_g2l = star_dynamics_code.particles.new_channel_to(stars)
gravity = bridge.Bridge(use_threading=False)
gravity.add_system(star_dynamics_code, (galaxy_dynamics_code, ))
gravity.timestep = 0.5 | units.Myr
solver = gravity
if snapshot:
plot_number = 0
last_plot_time = 0 | units.Myr
make_plot_galstars(disk1, bulge1, stars,
"MW and Solar System\nt = 0 Myr",
'galstars_' + str(plot_number).zfill(4))
x = [] | units.kpc
y = [] | units.kpc
current_iter = 0
total_iter = int(t_end / interval) + 1
t_end_scalar = t_end.value_in(units.Myr)
times = np.arange(0., t_end_scalar, interval.value_in(
units.Myr)) | units.Myr
widgets = [
'Step ',
pbwg.SimpleProgress(), ' ',
pbwg.Bar(marker='=', tip='>', left='[', right=']', fill=' '),
pbwg.Percentage(), ' - ',
pbwg.ETA('ETA'),
pbwg.EndMsg()
]
progress = pbar.ProgressBar(widgets=widgets,
maxval=total_iter,
fd=sys.stdout).start()
for time in times:
solver.evolve_model(time)
mw_channel.copy()
if leapfrog:
star_solver(current_iter, stars, galaxy_dynamics_code)
else:
ch_g2l.copy()
x.append(stars.x)
y.append(stars.y)
if snapshot:
if check_last_plot_time(solver.model_time, last_plot_time,
t_end / snap_freq):
halo1, disk1, bulge1 = galaxy_structures(set1, n_disk, n_bulge)
plot_number += 1
last_plot_time = solver.model_time
make_plot_galstars(
disk1, bulge1, stars,
"MW and Solar System\nt = {} Myr".format(
np.round(solver.model_time.value_in(units.Myr),
decimals=0)),
'galstars_' + str(plot_number).zfill(4))
current_iter += 1
progress.update(current_iter)
progress.finish()
galaxy_dynamics_code.stop()
if not leapfrog:
star_dynamics_code.stop()
def simulate_single_galaxy(galaxy1,
converter,
n_halo,
n_bulge,
n_disk,
t_end,
glxy_path,
solver=Gadget2,
interval=0.5 | units.Myr,
plot=False,
plot_freq=100):
if isinstance(solver, Gadget2):
nw = 4
elif isinstance(solver, Fi):
nw = 1
dynamics_code = solver(converter, number_of_workers=4)
#dynamics_code = Fi(converter, redirection='none', number_of_workers=1)
dynamics_code.parameters.epsilon_squared = (100 | units.parsec)**2
set1 = dynamics_code.dm_particles.add_particles(galaxy1)
halo1 = set1[n_disk + n_bulge:]
bulge1 = set1[n_disk:n_disk + n_bulge]
disk1 = set1[:n_disk]
dynamics_code.particles.move_to_center()
if isinstance(dynamics_code, Gadget2):
dynamics_code.timestep = interval
elif isinstance(dynamics_code, Fi):
dynamics_code.parameters.timestep = interval
dynamics_code.update_particle_set()
if plot == True:
plot_number = 0
last_plot_time = 0 | units.Myr
plot_single_galaxy(halo1, disk1, bulge1, "TEST\nt = 0 Myr", glxy_path,
'mw_testrun_' + str(plot_number).zfill(4))
current_iter = 0
t_end_in_Myr = t_end.as_quantity_in(units.Gyr)
total_iter = int(t_end_in_Myr / interval) + 10
widgets = [
'Step ',
pbwg.SimpleProgress(), ' ',
pbwg.Bar(marker='=', tip='>', left='[', right=']', fill=' '),
pbwg.Percentage(), ' - ',
pbwg.ETA('ETA'),
pbwg.EndMsg()
]
progress = pbar.ProgressBar(widgets=widgets,
maxval=total_iter,
fd=sys.stdout).start()
while dynamics_code.model_time < t_end:
current_iter += 1
dynamics_code.evolve_model(dynamics_code.model_time + interval)
if isinstance(dynamics_code, Fi):
dynamics_code.update_particle_set()
if plot == True:
if check_last_plot_time(dynamics_code.model_time, last_plot_time,
t_end / plot_freq):
plot_number += 1
last_plot_time = dynamics_code.model_time
plot_single_galaxy(
halo1, disk1, bulge1, "TEST\nt = {} Myr".format(
int(
np.round(dynamics_code.model_time.value_in(
units.Myr),
decimals=0))), glxy_path,
'mw_testrun_' + str(plot_number).zfill(4))
progress.update(current_iter)
progress.finish()
if plot == True:
plot_number += 1
plot_single_galaxy(
halo1, disk1, bulge1, "TEST\nt = {} Myr".format(
int(np.round(t_end.value_in(units.Myr), decimals=0))),
glxy_path, 'mw_testrun_' + str(plot_number).zfill(4))
dynamics_code.stop()