import os
import sys
import numpy
try:
from matplotlib import pyplot
HAS_MATPLOTLIB = True
except ImportError:
HAS_MATPLOTLIB = False
from amuse.community.fi import interface as interface
from amuse.ext.evrard_test import MakeEvrardTest
from amuse.ext.evrard_test import regular_grid_unit_cube
from amuse.ext.evrard_test import body_centered_grid_unit_cube
from amuse.test.amusetest import get_path_to_results
import logging
#logging.basicConfig(level=logging.DEBUG)
from amuse.rfi.core import is_mpd_running
def energy_plot(time,ek,ep,eth):
if not HAS_MATPLOTLIB:
return
pyplot.figure(figsize = (5, 5))
pyplot.xlabel(r'time')
pyplot.ylabel(r'energy')
pyplot.plot(time,ek)
pyplot.plot(time,ep)
pyplot.plot(time,eth)
pyplot.plot(time,ek+ep+eth)
test_results_path = get_path_to_results()
pyplot.savefig(os.path.join(test_results_path, "evrard_test.png"))
def run_evrard(x):
evrard=MakeEvrardTest(x)
mass,x,y,z,vx,vy,vz,u=evrard.new_model()
smooth=numpy.zeros_like(mass)
nb = interface.FiInterface(redirection="none")
nb.initialize_code()
# nb.set_stepout(99999)
# nb.set_steplog(99999)
nb.set_use_hydro(1)
nb.set_radiate(0)
nb.set_dtime(0.05)
# nb.set_gdgop(1)
nb.set_uentropy(0)
# nb.set_verbosity(0)
ids,error = nb.new_sph_particle(mass,smooth,x,y,z,vx,vy,vz,u)
if filter(lambda x: x != 0, error) != []: raise Exception
nb.commit_particles()
if hasattr(nb,"viewer"):
nb.viewer()
dt=0.05
tnow=0.
nb.synchronize_model()
time,Ek,Ep,Eth=[],[],[],[]
time.append(tnow)
e,ret=nb.get_kinetic_energy()
Ek.append(e)
e,ret=nb.get_potential_energy()
Ep.append(e)
e,ret=nb.get_thermal_energy()
Eth.append(e)
while tnow<3.0:
tnow=tnow+dt
nb.evolve_model(tnow)
nb.synchronize_model()
tnow,err=nb.get_time()
time.append(tnow)
e,ret=nb.get_kinetic_energy()
Ek.append(e)
e,ret=nb.get_potential_energy()
Ep.append(e)
e,ret=nb.get_thermal_energy()
Eth.append(e)
nb.cleanup_code()
nb.stop()
nb.stop()
time=numpy.array(time)
Ek=numpy.array(Ek)
Ep=numpy.array(Ep)
Eth=numpy.array(Eth)
energy_plot(time,Ek,Ep,Eth)
def test_evrard():
if not is_mpd_running():
return
run_evrard(64)
if __name__ in ("__main__", "__plot__"):
run_evrard(1000)
Keywords: python, amuse, astrophysics, matplotlib, pylab, example, codex (see how-to-search-examples)