68 lines
2.8 KiB
Python
Executable File
68 lines
2.8 KiB
Python
Executable File
#!/usr/bin/python
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# -*- coding:utf-8 -*-
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from sys import exit as sysexit
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import numpy as np
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import matplotlib.pyplot as plt
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from lib.objects import Body, System
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from lib.LeapFrog import leapfrog
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from lib.hermite import hermite
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from lib.plots import display_parameters
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from lib.units import *
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def main():
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#initialisation
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m = np.array([1., 1., 1e-1],dtype=np.longdouble)*Ms/Ms # Masses in Solar mass
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a = np.array([1., 1., 5.],dtype=np.longdouble)*au/au # Semi-major axis in astronomical units
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e = np.array([0., 0., 0.],dtype=np.longdouble) # Eccentricity
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<<<<<<< HEAD
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psi = np.array([0., 0., 80.],dtype=np.longdouble)*np.pi/180. # Inclination of the orbital plane in degrees
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=======
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psi = np.array([0., 0., 0.],dtype=np.longdouble)*np.pi/180. # Inclination of the orbital plane in degrees
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>>>>>>> 22fa187 (add Energy display)
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x1 = np.array([0., -1., 0.],dtype=np.longdouble)*a[0]*(1.+e[0])
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x2 = np.array([0., 1., 0.],dtype=np.longdouble)*a[1]*(1.+e[1])
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x3 = np.array([np.cos(psi[2]), 0., np.sin(psi[2])],dtype=np.longdouble)*a[2]*(1.+e[2])
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q = np.array([x1, x2, x3],dtype=np.longdouble)
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v1 = np.array([np.sqrt(Ga*m[0]*m[1]/((m[0]+m[1])*np.sqrt(np.sum((q[0]-q[1])**2)))), 0., 0.],dtype=np.longdouble)
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v2 = np.array([-np.sqrt(Ga*m[0]*m[1]/((m[0]+m[1])*np.sqrt(np.sum((q[0]-q[1])**2)))), 0., 0.],dtype=np.longdouble)
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v3 = np.array([0., np.sqrt(Ga*(m[0]+m[1])*(2./np.sqrt(np.sum(q[2]**2))-1./a[2])), 0.],dtype=np.longdouble)
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v = np.array([v1, v2, v3],dtype=np.longdouble)
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#integration parameters
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duration, step = 100*yr, np.array([600000.],dtype=np.longdouble) #integration time and step in seconds
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step = np.sort(step)[::-1]
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integrator = "leapfrog"
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n_bodies = 3
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display = True
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gif = False
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savename = "{0:d}bodies_{1:s}".format(n_bodies, integrator)
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#simulation start
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E, L, ecc, sma = [], [], [], []
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for i,step0 in enumerate(step):
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bodylist = []
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for j in range(n_bodies):
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bodylist.append(Body(m[j], q[j], v[j]))
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bin_syst = System(bodylist[0:2])
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dyn_syst = System(bodylist, main=True)
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if i != 0:
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display = False
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if integrator.lower() in ['leapfrog', 'frogleap', 'frog']:
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E0, L0, sma0, ecc0 = leapfrog(dyn_syst, bin_syst, duration, step0, recover_param=True, display=display, savename=savename, gif=gif)
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elif integrator.lower() in ['hermite','herm']:
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E0, L0, sma0, ecc0 = hermite(dyn_syst, bin_syst, duration, step0, recover_param=True, display=display, savename=savename, gif=gif)
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E.append(E0)
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L.append(L0)
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ecc.append(ecc0)
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sma.append(sma0)
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parameters = [duration, step, dyn_syst, integrator]
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display_parameters(E, L, sma, ecc, parameters=parameters, savename=savename)
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return 0
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if __name__ == '__main__':
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sysexit(main())
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