def simulation(par):
saturn_a, saturn_e = par
rebound.reset()
rebound.integrator = "whfast-nocor"
rebound.min_dt = 5.
rebound.dt = 1.
# These parameters are only approximately those of Jupiter and Saturn.
sun = rebound.Particle(m=1.)
rebound.add(sun)
jupiter = rebound.add(primary=sun,
m=0.000954,
a=5.204,
anom=0.600,
omega=0.257,
e=0.048)
saturn = rebound.add(primary=sun,
m=0.000285,
a=saturn_a,
anom=0.871,
omega=1.616,
e=saturn_e)
rebound.move_to_com()
rebound.init_megno(1e-16)
rebound.integrate(1e3 * 2. * np.pi)
return [
rebound.calculate_megno(),
1. / (rebound.calculate_lyapunov() * 2. * np.pi)
] # returns MEGNO and Lypunov timescale in years
def simulation(par):
saturn_a, saturn_e = par
rebound.reset()
rebound.integrator = "whfast-nocor"
rebound.dt = 5.
# These parameters are only approximately those of Jupiter and Saturn.
rebound.add(m=1.)
rebound.add(m=0.000954, a=5.204, anom=0.600, omega=0.257, e=0.048)
rebound.add(m=0.000285, a=saturn_a, anom=0.871, omega=1.616, e=saturn_e)
rebound.move_to_com()
rebound.init_megno(1e-16)
rebound.integrate(5e2*2.*np.pi) # integrator for 500 years
return [rebound.calculate_megno(),1./(rebound.calculat_lyapunov()*2.*np.pi)] # returns MEGNO and Lypunov timescale in years
def simulation(integrator):
print("Running "+integrator)
with open(integrator+".txt","w") as f:
rebound.reset()
rebound.integrator = integrator
rebound.dt = 0.2
rebound.add(m=1.)
rebound.add(m=0.01, a=1,e=0.1)
rebound.add(m=0.01, a=2.)
rebound.move_to_com()
rebound.init_megno(1e-10)
particles = rebound.particles
times = np.logspace(2,5,num=1000)
for t in times:
rebound.integrate(t,0)
print("%e %e %e %e %e %e %e %e\n" %(rebound.t, rebound.calculate_megno(), particles[0].x, particles[1].x, particles[2].x, particles[3].x, particles[4].x, particles[5].x),file=f)
def simulation(par):
saturn_a, saturn_e = par
rebound.reset()
rebound.integrator = "whfast-nocor"
rebound.min_dt = 5.
rebound.dt = 1.
# These parameters are only approximately those of Jupiter and Saturn.
sun = rebound.Particle(m=1.)
rebound.add(sun)
jupiter = rebound.add(primary=sun,m=0.000954, a=5.204, anom=0.600, omega=0.257, e=0.048)
saturn = rebound.add(primary=sun,m=0.000285, a=saturn_a, anom=0.871, omega=1.616, e=saturn_e)
rebound.move_to_com()
rebound.init_megno(1e-16)
rebound.integrate(1e3*2.*np.pi)
return [rebound.calculate_megno(),1./(rebound.calculate_lyapunov()*2.*np.pi)] # returns MEGNO and Lypunov timescale in years
def simulation(par):
saturn_a, saturn_e = par
rebound.reset()
rebound.integrator = "whfast-nocor"
rebound.dt = 5.
# These parameters are only approximately those of Jupiter and Saturn.
rebound.add(m=1.)
rebound.add(m=0.000954, a=5.204, anom=0.600, omega=0.257, e=0.048)
rebound.add(m=0.000285, a=saturn_a, anom=0.871, omega=1.616, e=saturn_e)
rebound.move_to_com()
rebound.init_megno(1e-16)
rebound.integrate(5e2 * 2. * np.pi) # integrator for 500 years
return [
rebound.calculate_megno(),
1. / (rebound.calculat_lyapunov() * 2. * np.pi)
] # returns MEGNO and Lypunov timescale in years
def simulation(integrator):
print("Running " + integrator)
with open(integrator + ".txt", "w") as f:
rebound.reset()
rebound.integrator = integrator
rebound.dt = 0.2
rebound.add(m=1.)
rebound.add(m=0.01, a=1, e=0.1)
rebound.add(m=0.01, a=2.)
rebound.move_to_com()
rebound.init_megno(1e-10)
particles = rebound.particles
times = np.logspace(2, 5, num=1000)
for t in times:
rebound.integrate(t, 0)
print("%e %e %e %e %e %e %e %e\n" %
(rebound.t, rebound.calculate_megno(), particles[0].x,
particles[1].x, particles[2].x, particles[3].x,
particles[4].x, particles[5].x),
file=f)
