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calculate innermost semimajor axis

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Lukas Winkler 2021-02-08 19:03:51 +01:00
parent 0a1095571d
commit 54b8ac3695
Signed by: lukas
GPG key ID: 54DE4D798D244853
2 changed files with 21 additions and 3 deletions
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11
utils.py
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@ -11,10 +11,14 @@ from matplotlib.axes import Axes
from matplotlib.figure import Figure from matplotlib.figure import Figure
from numpy import linalg from numpy import linalg
from rebound import Simulation, Orbit, Particle, OrbitPlot from rebound import Simulation, Orbit, Particle, OrbitPlot
from scipy.constants import pi, gravitational_constant
from setproctitle import setproctitle from setproctitle import setproctitle
from extradata import ExtraData from extradata import ExtraData
solar_radius = 6.957e8
solar_mass = 1.9885e+30
def unique_hash() -> c_uint32: def unique_hash() -> c_uint32:
""" """
@ -40,6 +44,13 @@ def innermost_period(sim: Simulation) -> float:
return orb.P return orb.P
def third_kepler_law(orbital_period: float):
return (
gravitational_constant * solar_mass / (4 * pi ** 2)
* orbital_period ** 2
) ** (1 / 3)
def total_momentum(sim: Simulation) -> float: def total_momentum(sim: Simulation) -> float:
total = 0 total = 0
for p in sim.particles: for p in sim.particles:

13
water_sim.py
View file

@ -8,12 +8,13 @@ from sys import argv
from rebound import Simulation, Particle, NoParticles, Escape, \ from rebound import Simulation, Particle, NoParticles, Escape, \
SimulationArchive SimulationArchive
from rebound.simulation import POINTER_REB_SIM, reb_collision from rebound.simulation import POINTER_REB_SIM, reb_collision
from scipy.constants import astronomical_unit, mega from scipy.constants import astronomical_unit, mega, year
from extradata import ExtraData, ParticleData from extradata import ExtraData, ParticleData
from merge import merge_particles, handle_escape from merge import merge_particles, handle_escape
from radius_utils import radius from radius_utils import radius
from utils import unique_hash, filename_from_argv, innermost_period, total_momentum, process_friendlyness, total_mass from utils import unique_hash, filename_from_argv, innermost_period, total_momentum, process_friendlyness, total_mass, \
third_kepler_law, solar_radius
MIN_TIMESTEP_PER_ORBIT = 20 MIN_TIMESTEP_PER_ORBIT = 20
PERFECT_MERGING = False PERFECT_MERGING = False
@ -54,6 +55,12 @@ def main(fn: Path, testrun=False):
extradata.meta.num_savesteps = num_savesteps extradata.meta.num_savesteps = num_savesteps
extradata.meta.perfect_merging = PERFECT_MERGING extradata.meta.perfect_merging = PERFECT_MERGING
innermost_semimajor_axis = third_kepler_law(
orbital_period=sim.dt * year * MIN_TIMESTEP_PER_ORBIT
) / astronomical_unit
print(f"innermost semimajor axis is {innermost_semimajor_axis}")
initcon = INITCON_FILE.read_text() initcon = INITCON_FILE.read_text()
num_embryos = int(re.search(r"Generated (\d+) minor bodies", initcon, re.MULTILINE).group(1)) num_embryos = int(re.search(r"Generated (\d+) minor bodies", initcon, re.MULTILINE).group(1))
num_planetesimals = int(re.search(r"Generated (\d+) small bodies", initcon, re.MULTILINE).group(1)) num_planetesimals = int(re.search(r"Generated (\d+) small bodies", initcon, re.MULTILINE).group(1))
@ -92,7 +99,7 @@ def main(fn: Path, testrun=False):
) )
if columns[1] == 0: # that should not be needed, but nevertheless is if columns[1] == 0: # that should not be needed, but nevertheless is
part = Particle(m=columns[0], hash=hash) part = Particle(m=columns[0], hash=hash, r=solar_radius / astronomical_unit)
else: else:
part = Particle( part = Particle(
m=columns[0], a=columns[1], e=columns[2], m=columns[0], a=columns[1], e=columns[2],