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main.py
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main.py
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import numpy as np
import matplotlib.pyplot as plt
import mass_assign as ms
import visualize as vi
import galaxy
import Poisson
import force
import profiles as pf
from params import *
np.seterr(all="ignore")
if __name__ == "__main__":
# initializing particles
stellar1 = galaxy.set_spheroid(N, [300, 300, 256], [-5, -5, 0],
pf.power, (1, 3.61, 2), pf.const, (99,))
stellar2 = galaxy.set_spheroid(N//2, [180, 180, 256], [5, 10, 0],
pf.power, (1, 2.55, 2), pf.const, (69,))
part = np.vstack( (stellar1, stellar2) )
# density field
dens = ms.CIC_3D(part)
# gravitational potential
Phi = Poisson.poisson_solver_fft3(dens)
# acceleration field
a = force.accel(Phi)
# time evolution
for n, t in enumerate(np.arange(0, t_tot, dt)):
# leapfrog
part[:, iz:ix+1] += part[:, ivz:ivx+1] * dt / 2
# update fields
dens = ms.CIC_3D(part)
Phi = Poisson.poisson_solver_fft3(dens)
a = force.accel(Phi)
for i in range(len(part)):
part[i][ivz:ivx+1] += force.Force(part[i][iz:ix+1], a) * dt / part[i][im]
part[:, iz:ix+1] += part[:, ivz:ivx+1] * dt / 2
# plot
# vi.plot_all(part, dens, Phi, a)
vi.save_data(part, "./data/"+str(n)+".npy")