def new_star_code_phigrape(self):
result = PhiGRAPE(self.converter, mode="gpu")
result.parameters.initialize_gpu_once = 1
result.parameters.epsilon_squared = self.star_epsilon ** 2
result.particles.add_particles(self.new_particles_cluster())
result.commit_particles()
return result
def test10(self):
instance = PhiGRAPE(**default_test_options)
instance.initialize_code()
instance.parameters.set_defaults()
stars = new_plummer_model(100)
stars.radius = 0 | nbody_system.length
instance.particles.add_particles(stars)
channel = stars.new_channel_to(instance.particles)
instance.evolve_model(0.001 | nbody_system.time)
e0 = instance.kinetic_energy + instance.potential_energy
stars.mass *= 0.9
channel.copy()
instance.synchronize_model()
e1 = instance.kinetic_energy + instance.potential_energy
delta_e = e1 - e0
self.assertTrue(e1 != e0)
instance.stop()
def test7(self):
instance = PhiGRAPE(**default_test_options)
instance.initialize_code()
instance.parameters.set_defaults()
particles = datamodel.Particles(2)
particles.mass = [1.0, 1.0] | nbody_system.mass
particles.radius = [0.0001, 0.0001] | nbody_system.length
particles.position = [[0.0,0.0,0.0], [2.0,0.0,0.0]] | nbody_system.length
particles.velocity = [[0.0, 0.0, 0.0], [0.0, 0.0, 0.0]] | nbody_system.speed
instance.particles.add_particles(particles)
instance.commit_particles()
zero = [0.0, 0.0, 0.0] | nbody_system.length
fx, fy, fz = instance.get_gravity_at_point(zero, [0.5, 1.0, 1.5] | nbody_system.length, zero, zero)
self.assertAlmostRelativeEqual(fx[0], -3.55555555556 | nbody_system.acceleration, 5)
self.assertAlmostRelativeEqual(fy[0], 0.0 | nbody_system.acceleration, 3)
self.assertAlmostRelativeEqual(fz[0], 0.0 | nbody_system.acceleration, 3)
self.assertAlmostRelativeEqual(fx[1], 0.0 | nbody_system.acceleration, 3)
self.assertAlmostRelativeEqual(fy[1], 0.0 | nbody_system.acceleration, 3)
self.assertAlmostRelativeEqual(fz[1], 0.0 | nbody_system.acceleration, 3)
self.assertAlmostRelativeEqual(fx[2], 3.55555555556 | nbody_system.acceleration, 5)
self.assertAlmostRelativeEqual(fy[2], 0.0 | nbody_system.acceleration, 3)
self.assertAlmostRelativeEqual(fz[2], 0.0 | nbody_system.acceleration, 3)
n = 512
x = nbody_system.length.new_quantity(numpy.linspace(0.1, 1.9, n))
zero = nbody_system.length.new_quantity(numpy.zeros(n))
fx, fy, fz = instance.get_gravity_at_point(zero, x, zero, zero)
for i in range(n//2):
self.assertAlmostRelativeEqual(fx[i], - fx[n - 1 - i], 5)
instance.stop()
def test19(self):
converter = nbody_system.nbody_to_si(1 | units.MSun, 1 | units.parsec)
particles = datamodel.Particles(2)
particles.mass = 100 | units.MSun
particles.radius = 200 | units.RSun
particles[0].position = [0,0,0] | units.parsec
particles[1].position = [1,0,0] | units.parsec
particles.velocity = [0,0,0] | units.km / units.s
code = PhiGRAPE(
converter,
PhiGRAPEInterface.MODE_G6LIB,
number_of_workers=2
)
code.initialize_code()
stop_cond = code.stopping_conditions.collision_detection
stop_cond.enable()
code.particles.add_particles(particles)
code.evolve_model( 0.08 | nbody_system.time)
self.assertTrue(stop_cond.is_set())
def new_star_code_phigrape(self):
result = PhiGRAPE(mode="gpu")
result.parameters.initialize_gpu_once = 1
result.parameters.epsilon_squared = self.star_epsilon**2
result.particles.add_particles(self.new_particles_cluster())
result.commit_particles()
return result
def test10(self):
instance = PhiGRAPE(**default_test_options)
instance.initialize_code()
instance.parameters.set_defaults()
stars = new_plummer_model(100)
stars.radius = 0 | nbody_system.length
instance.particles.add_particles(stars)
channel = stars.new_channel_to(instance.particles)
instance.evolve_model(0.001 | nbody_system.time)
e0 = instance.kinetic_energy + instance.potential_energy
stars.mass *= 0.9
channel.copy()
instance.synchronize_model()
e1 = instance.kinetic_energy + instance.potential_energy
delta_e = e1 - e0
self.assertTrue(e1 != e0)
instance.stop()
def test7(self):
instance = PhiGRAPE(**default_test_options)
instance.initialize_code()
instance.parameters.set_defaults()
particles = datamodel.Particles(2)
particles.mass = [1.0, 1.0] | nbody_system.mass
particles.radius = [0.0001, 0.0001] | nbody_system.length
particles.position = [[0.0,0.0,0.0], [2.0,0.0,0.0]] | nbody_system.length
particles.velocity = [[0.0, 0.0, 0.0], [0.0, 0.0, 0.0]] | nbody_system.speed
instance.particles.add_particles(particles)
instance.commit_particles()
zero = [0.0, 0.0, 0.0] | nbody_system.length
fx, fy, fz = instance.get_gravity_at_point(zero, [0.5, 1.0, 1.5] | nbody_system.length, zero, zero)
self.assertAlmostRelativeEqual(fx[0], -3.55555555556 | nbody_system.acceleration, 5)
self.assertAlmostRelativeEqual(fy[0], 0.0 | nbody_system.acceleration, 3)
self.assertAlmostRelativeEqual(fz[0], 0.0 | nbody_system.acceleration, 3)
self.assertAlmostRelativeEqual(fx[1], 0.0 | nbody_system.acceleration, 3)
self.assertAlmostRelativeEqual(fy[1], 0.0 | nbody_system.acceleration, 3)
self.assertAlmostRelativeEqual(fz[1], 0.0 | nbody_system.acceleration, 3)
self.assertAlmostRelativeEqual(fx[2], 3.55555555556 | nbody_system.acceleration, 5)
self.assertAlmostRelativeEqual(fy[2], 0.0 | nbody_system.acceleration, 3)
self.assertAlmostRelativeEqual(fz[2], 0.0 | nbody_system.acceleration, 3)
n = 512
x = nbody_system.length.new_quantity(numpy.linspace(0.1, 1.9, n))
zero = nbody_system.length.new_quantity(numpy.zeros(n))
fx, fy, fz = instance.get_gravity_at_point(zero, x, zero, zero)
for i in range(n/2):
self.assertAlmostRelativeEqual(fx[i], - fx[n - 1 - i], 5)
instance.stop()
def new_instance_of_capreole_and_nbody_code(self):
gridcode=Capreole(number_of_workers=self.number_of_workers)
gridcode.initialize_code()
nbodycode = PhiGRAPE(mode="gpu")
#nbodycode = Octgrav(mode="gpu")
nbodycode.initialize_code()
nbodycode.parameters.epsilon_squared = (self.size / (10000.0 * self.number_of_grid_points)) ** 2
nbodycode.commit_parameters()
result = HydroGridAndNbodyWithAccelerationTransfer(gridcode, nbodycode)
return result
def test11(self):
print "Testing PhiGRAPE collision_detection"
particles = datamodel.Particles(7)
particles.mass = 0.001 | nbody_system.mass
particles.radius = 0.01 | nbody_system.length
particles.x = [-101.0, -100.0, -0.5, 0.5, 100.0, 101.0, 104.0] | nbody_system.length
particles.y = 0 | nbody_system.length
particles.z = 0 | nbody_system.length
particles.velocity = [[2, 0, 0], [-2, 0, 0]]*3 + [[-4, 0, 0]] | nbody_system.speed
instance = PhiGRAPE(redirection='none', **default_test_options)
instance.initialize_code()
instance.parameters.set_defaults()
instance.particles.add_particles(particles)
collisions = instance.stopping_conditions.collision_detection
collisions.enable()
instance.evolve_model(1.0 | nbody_system.time)
self.assertTrue(collisions.is_set())
self.assertTrue(instance.model_time < 0.5 | nbody_system.time)
self.assertEquals(len(collisions.particles(0)), 3)
self.assertEquals(len(collisions.particles(1)), 3)
self.assertEquals(len(particles - collisions.particles(0) - collisions.particles(1)), 1)
self.assertEquals(abs(collisions.particles(0).x - collisions.particles(1).x) <
(collisions.particles(0).radius + collisions.particles(1).radius),
[True, True, True])
sticky_merged = datamodel.Particles(len(collisions.particles(0)))
sticky_merged.mass = collisions.particles(0).mass + collisions.particles(1).mass
sticky_merged.radius = collisions.particles(0).radius
for p1, p2, merged in zip(collisions.particles(0), collisions.particles(1), sticky_merged):
merged.position = (p1 + p2).center_of_mass()
merged.velocity = (p1 + p2).center_of_mass_velocity()
print instance.model_time
print instance.particles
instance.particles.remove_particles(collisions.particles(0) + collisions.particles(1))
instance.particles.add_particles(sticky_merged)
instance.evolve_model(1.0 | nbody_system.time)
print
print instance.model_time
print instance.particles
self.assertTrue(collisions.is_set())
self.assertTrue(instance.model_time < 1.0 | nbody_system.time)
self.assertEquals(len(collisions.particles(0)), 1)
self.assertEquals(len(collisions.particles(1)), 1)
self.assertEquals(len(instance.particles - collisions.particles(0) - collisions.particles(1)), 2)
self.assertEquals(abs(collisions.particles(0).x - collisions.particles(1).x) <
(collisions.particles(0).radius + collisions.particles(1).radius),
[True])
instance.stop()
def test14(self):
particles = datamodel.Particles(2)
particles.x = [0.0,10.0] | nbody_system.length
particles.y = 0 | nbody_system.length
particles.z = 0 | nbody_system.length
particles.radius = 0.005 | nbody_system.length
particles.vx = 0 | nbody_system.speed
particles.vy = 0 | nbody_system.speed
particles.vz = 0 | nbody_system.speed
particles.mass = 1.0 | nbody_system.mass
very_short_time_to_evolve = 1 | units.s
very_long_time_to_evolve = 1e9 | nbody_system.time
instance = PhiGRAPE(**default_test_options)
instance.initialize_code()
instance.parameters.stopping_conditions_timeout = very_short_time_to_evolve
self.assertEquals(instance.parameters.stopping_conditions_timeout, very_short_time_to_evolve)
instance.parameters.epsilon_squared = (0.01 | nbody_system.length)**2
instance.particles.add_particles(particles)
instance.stopping_conditions.timeout_detection.enable()
start = time.time()
instance.evolve_model(very_long_time_to_evolve)
end = time.time()
self.assertTrue(instance.stopping_conditions.timeout_detection.is_set())
self.assertTrue((end-start)<very_short_time_to_evolve.value_in(units.s) + 2)#2 = some overhead compensation
instance.stop()
def new_instance_of_athena_and_nbody_code(self):
gridcode=Athena(redirection="none", number_of_workers=1)
gridcode.initialize_code()
gridcode.parameters.gamma = self.gamma
gridcode.parameters.courant_number=0.3
gridcode.set_has_external_gravitational_potential(1)
nbodycode = PhiGRAPE(mode="gpu")
#nbodycode = Octgrav(mode="gpu")
nbodycode.initialize_code()
nbodycode.parameters.epsilon_squared = (self.size / (10000.0 * self.number_of_grid_points)) ** 2
nbodycode.commit_parameters()
result = HydroGridAndNbody(gridcode, nbodycode)
return result
def test11(self):
print "Testing PhiGRAPE collision_detection"
particles = datamodel.Particles(7)
particles.mass = 0.001 | nbody_system.mass
particles.radius = 0.01 | nbody_system.length
particles.x = [-101.0, -100.0, -0.5, 0.5, 100.0, 101.0, 104.0] | nbody_system.length
particles.y = 0 | nbody_system.length
particles.z = 0 | nbody_system.length
particles.velocity = [[2, 0, 0], [-2, 0, 0]]*3 + [[-4, 0, 0]] | nbody_system.speed
instance = PhiGRAPE(redirection='none', **default_test_options)
instance.initialize_code()
instance.parameters.set_defaults()
instance.particles.add_particles(particles)
collisions = instance.stopping_conditions.collision_detection
collisions.enable()
instance.evolve_model(1.0 | nbody_system.time)
self.assertTrue(collisions.is_set())
self.assertTrue(instance.model_time < 0.5 | nbody_system.time)
self.assertEquals(len(collisions.particles(0)), 3)
self.assertEquals(len(collisions.particles(1)), 3)
self.assertEquals(len(particles - collisions.particles(0) - collisions.particles(1)), 1)
self.assertEquals(abs(collisions.particles(0).x - collisions.particles(1).x) <
(collisions.particles(0).radius + collisions.particles(1).radius),
[True, True, True])
sticky_merged = datamodel.Particles(len(collisions.particles(0)))
sticky_merged.mass = collisions.particles(0).mass + collisions.particles(1).mass
sticky_merged.radius = collisions.particles(0).radius
for p1, p2, merged in zip(collisions.particles(0), collisions.particles(1), sticky_merged):
merged.position = (p1 + p2).center_of_mass()
merged.velocity = (p1 + p2).center_of_mass_velocity()
print instance.model_time
print instance.particles
instance.particles.remove_particles(collisions.particles(0) + collisions.particles(1))
instance.particles.add_particles(sticky_merged)
instance.evolve_model(1.0 | nbody_system.time)
print
print instance.model_time
print instance.particles
self.assertTrue(collisions.is_set())
self.assertTrue(instance.model_time < 1.0 | nbody_system.time)
self.assertEquals(len(collisions.particles(0)), 1)
self.assertEquals(len(collisions.particles(1)), 1)
self.assertEquals(len(instance.particles - collisions.particles(0) - collisions.particles(1)), 2)
self.assertEquals(abs(collisions.particles(0).x - collisions.particles(1).x) <
(collisions.particles(0).radius + collisions.particles(1).radius),
[True])
instance.stop()
def test14(self):
particles = datamodel.Particles(2)
particles.x = [0.0,10.0] | nbody_system.length
particles.y = 0 | nbody_system.length
particles.z = 0 | nbody_system.length
particles.radius = 0.005 | nbody_system.length
particles.vx = 0 | nbody_system.speed
particles.vy = 0 | nbody_system.speed
particles.vz = 0 | nbody_system.speed
particles.mass = 1.0 | nbody_system.mass
very_short_time_to_evolve = 1 | units.s
very_long_time_to_evolve = 1e9 | nbody_system.time
instance = PhiGRAPE(**default_test_options)
instance.initialize_code()
instance.parameters.stopping_conditions_timeout = very_short_time_to_evolve
self.assertEquals(instance.parameters.stopping_conditions_timeout, very_short_time_to_evolve)
instance.parameters.epsilon_squared = (0.01 | nbody_system.length)**2
instance.particles.add_particles(particles)
instance.stopping_conditions.timeout_detection.enable()
start = time.time()
instance.evolve_model(very_long_time_to_evolve)
end = time.time()
self.assertTrue(instance.stopping_conditions.timeout_detection.is_set())
self.assertTrue((end-start)<very_short_time_to_evolve.value_in(units.s) + 2)#2 = some overhead compensation
instance.stop()
def test4(self):
convert_nbody = nbody_system.nbody_to_si(5.0 | units.kg, 10.0 | units.m)
instance = PhiGRAPE(convert_nbody, **default_test_options)
instance.initialize_code()
instance.parameters.set_defaults()
particles = datamodel.Particles(2)
self.assertEquals(len(instance.particles), 0)
particles.mass = [15.0, 30.0] | units.kg
particles.radius = [10.0, 20.0] | units.m
particles.position = [[10.0, 20.0, 30.0], [20.0, 40.0, 60.0]] | units.m
particles.velocity = [[0.0, 0.0, 0.0], [0.0, 0.0, 0.0]] | units.m / units.s
instance.particles.add_particles(particles)
self.assertEquals(len(instance.particles), 2)
instance.particles.mass = [17.0, 33.0] | units.kg
self.assertEquals(instance.get_mass(1), 17.0| units.kg)
self.assertEquals(instance.get_mass(2), 33.0| units.kg)
instance.stop()
def test19(self):
converter = nbody_system.nbody_to_si(1 | units.MSun, 1 | units.parsec)
particles = datamodel.Particles(2)
particles.mass = 100 | units.MSun
particles.radius = 200 | units.RSun
particles[0].position = [0,0,0] | units.parsec
particles[1].position = [1,0,0] | units.parsec
particles.velocity = [0,0,0] | units.km / units.s
code = PhiGRAPE(
converter,
PhiGRAPEInterface.MODE_G6LIB,
number_of_workers=2
)
code.initialize_code()
stop_cond = code.stopping_conditions.collision_detection
stop_cond.enable()
code.particles.add_particles(particles)
code.evolve_model( 0.08 | nbody_system.time)
self.assertTrue(stop_cond.is_set())
def test4(self):
convert_nbody = nbody_system.nbody_to_si(5.0 | units.kg, 10.0 | units.m)
instance = PhiGRAPE(convert_nbody, **default_test_options)
instance.initialize_code()
instance.parameters.set_defaults()
particles = datamodel.Particles(2)
self.assertEquals(len(instance.particles), 0)
particles.mass = [15.0, 30.0] | units.kg
particles.radius = [10.0, 20.0] | units.m
particles.position = [[10.0, 20.0, 30.0], [20.0, 40.0, 60.0]] | units.m
particles.velocity = [[0.0, 0.0, 0.0], [0.0, 0.0, 0.0]] | units.m / units.s
instance.particles.add_particles(particles)
self.assertEquals(len(instance.particles), 2)
instance.particles.mass = [17.0, 33.0] | units.kg
self.assertEquals(instance.get_mass(1), 17.0| units.kg)
self.assertEquals(instance.get_mass(2), 33.0| units.kg)
instance.stop()
def test18(self):
print "Testing PhiGRAPE delete_particle"
number_of_particles = 15
delete_order = [6, 9, 3, 1, 0, 2, 5]
number_of_initial_deletes = 3
particles = datamodel.Particles(number_of_particles)
particles.mass = range(1, number_of_particles + 1) | nbody_system.mass
particles.radius = 0.01 | nbody_system.length
particles.x = range(number_of_particles) | nbody_system.length
particles.y = 0 | nbody_system.length
particles.z = 0 | nbody_system.length
particles.vx = range(number_of_particles) | nbody_system.speed
particles.vy = 0 | nbody_system.speed
particles.vz = 0 | nbody_system.speed
instance = PhiGRAPE(**default_test_options)
instance.initialize_code()
instance.parameters.set_defaults()
initial_number_of_particles = number_of_particles - len(delete_order) + number_of_initial_deletes
instance.particles.add_particles(particles[:initial_number_of_particles])
index_new_particle = initial_number_of_particles
self.assertEquals(len(instance.particles), initial_number_of_particles)
instance.evolve_model(0.01 | nbody_system.time)
instance.particles.remove_particles(particles[delete_order[:number_of_initial_deletes]])
number_of_deletes = number_of_initial_deletes
self.assertEquals(len(instance.particles), initial_number_of_particles - number_of_deletes)
for i, particle_index in enumerate(delete_order[number_of_initial_deletes:]):
instance.evolve_model((i+1) / 10.0 | nbody_system.time)
instance.particles.remove_particle(particles[particle_index])
number_of_deletes += 1
instance.particles.add_particle(particles[index_new_particle])
index_new_particle += 1
self.assertEquals(len(instance.particles), initial_number_of_particles - number_of_deletes + i + 1)
self.assertAlmostEquals(particles[:index_new_particle].total_mass() - instance.particles.total_mass(),
(delete_order[:number_of_deletes] | nbody_system.mass).sum() + (number_of_deletes | nbody_system.mass))
instance.stop()
def test5(self):
instance = PhiGRAPE(**default_test_options)
instance.initialize_code()
instance.parameters.set_defaults()
particles = datamodel.Particles(2)
particles.mass = [1.0, 1.0] | nbody_system.mass
particles.radius = [0.0001, 0.0001] | nbody_system.length
particles.position = [[0.0,0.0,0.0], [2.0,0.0,0.0]] | nbody_system.length
particles.velocity = [[0.0, 0.0, 0.0], [0.0, 0.0, 0.0]] | nbody_system.speed
instance.particles.add_particles(particles)
instance.commit_particles()
zero = 0.0 | nbody_system.length
fx, fy, fz = instance.get_gravity_at_point(zero, 1.0| nbody_system.length, zero, zero)
self.assertAlmostEqual(fx, 0.0 | nbody_system.acceleration, 3)
self.assertAlmostEqual(fy, 0.0 | nbody_system.acceleration, 3)
self.assertAlmostEqual(fz, 0.0 | nbody_system.acceleration, 3)
for x in (0.25, 0.5, 0.75):
x0 = x| nbody_system.length
x1 = (2.0 - x) | nbody_system.length
potential0 = instance.get_potential_at_point(zero, x0, zero, zero)
potential1 = instance.get_potential_at_point(zero, x1, zero, zero)
fx0, fy0, fz0 = instance.get_gravity_at_point(zero, x0, zero, zero)
fx1, fy1, fz1 = instance.get_gravity_at_point(zero, x1, zero, zero)
self.assertAlmostEqual(fy0, 0.0 | nbody_system.acceleration, 3)
self.assertAlmostEqual(fz0, 0.0 | nbody_system.acceleration, 3)
self.assertAlmostEqual(fy1, 0.0 | nbody_system.acceleration, 3)
self.assertAlmostEqual(fz1, 0.0 | nbody_system.acceleration, 3)
self.assertAlmostEqual(fx0, -1.0 * fx1, 5)
fx = (-1.0 / (x0**2) + 1.0 / (x1**2)) * (1.0 | nbody_system.length ** 3 / nbody_system.time ** 2)
self.assertAlmostEqual(fx, fx0, 2)
self.assertAlmostEqual(potential0, potential1, 5)
instance.stop()
def test6(self):
instance = PhiGRAPE(**default_test_options)
instance.initialize_code()
instance.parameters.set_defaults()
particles = datamodel.Particles(6)
particles.mass = nbody_system.mass.new_quantity(range(1,7))
particles.radius = 0.00001 | nbody_system.length
particles.position = [[-1.0,0.0,0.0],[1.0,0.0,0.0],[0.0,-1.0,0.0],[0.0,1.0,0.0],[0.0,0.0,-1.0],[0.0,0.0,1.0]] | nbody_system.length
particles.velocity = [[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0]] | nbody_system.speed
instance.particles.add_particles(particles)
instance.commit_particles()
copyof = instance.particles.copy()
self.assertEquals(2 | nbody_system.mass, copyof[1].mass)
instance.stop()
def test18(self):
print "Testing PhiGRAPE delete_particle"
number_of_particles = 15
delete_order = [6, 9, 3, 1, 0, 2, 5]
number_of_initial_deletes = 3
particles = datamodel.Particles(number_of_particles)
particles.mass = range(1, number_of_particles + 1) | nbody_system.mass
particles.radius = 0.01 | nbody_system.length
particles.x = range(number_of_particles) | nbody_system.length
particles.y = 0 | nbody_system.length
particles.z = 0 | nbody_system.length
particles.vx = range(number_of_particles) | nbody_system.speed
particles.vy = 0 | nbody_system.speed
particles.vz = 0 | nbody_system.speed
instance = PhiGRAPE(**default_test_options)
instance.initialize_code()
instance.parameters.set_defaults()
initial_number_of_particles = number_of_particles - len(delete_order) + number_of_initial_deletes
instance.particles.add_particles(particles[:initial_number_of_particles])
index_new_particle = initial_number_of_particles
self.assertEquals(len(instance.particles), initial_number_of_particles)
instance.evolve_model(0.01 | nbody_system.time)
instance.particles.remove_particles(particles[delete_order[:number_of_initial_deletes]])
number_of_deletes = number_of_initial_deletes
self.assertEquals(len(instance.particles), initial_number_of_particles - number_of_deletes)
for i, particle_index in enumerate(delete_order[number_of_initial_deletes:]):
instance.evolve_model((i+1) / 10.0 | nbody_system.time)
instance.particles.remove_particle(particles[particle_index])
number_of_deletes += 1
instance.particles.add_particle(particles[index_new_particle])
index_new_particle += 1
self.assertEquals(len(instance.particles), initial_number_of_particles - number_of_deletes + i + 1)
self.assertAlmostEquals(particles[:index_new_particle].total_mass() - instance.particles.total_mass(),
(delete_order[:number_of_deletes] | nbody_system.mass).sum() + (number_of_deletes | nbody_system.mass))
instance.stop()
def test_phigrape(self):
convert_nbody = nbody_system.nbody_to_si(1.0 | units.kg, 1.0 | units.km)
phigrape = PhiGRAPE(convert_nbody)
phigrape.parameters.epsilon_squared = 10 | units.km**2
docstring = phigrape.parameters.__doc__
print docstring
self.assertTrue("smoothing parameter for gravity calculations (default value:0.0 m**2)" in docstring)
self.assertTrue("timestep parameter (default value:0.02" in docstring)
self.assertTrue("parameter to determine the initial timestep (default value:0.01" in docstring)
parameter_str_method_output = str(phigrape.parameters)
self.assertTrue("epsilon_squared: 10000000.0 m**2" in parameter_str_method_output)
self.assertTrue("timestep_parameter: 0.0" in parameter_str_method_output)
self.assertTrue("initial_timestep_parameter: 0.0" in parameter_str_method_output)
def new_instance_of_capreole_and_nbody_code(self):
gridcode = Capreole(number_of_workers=self.number_of_workers)
gridcode.initialize_code()
nbodycode = PhiGRAPE(mode="gpu")
#nbodycode = Octgrav(mode="gpu")
nbodycode.initialize_code()
nbodycode.parameters.epsilon_squared = (
self.size / (10000.0 * self.number_of_grid_points))**2
nbodycode.commit_parameters()
result = HydroGridAndNbodyWithAccelerationTransfer(gridcode, nbodycode)
return result
def test6(self):
instance = PhiGRAPE(**default_test_options)
instance.initialize_code()
instance.parameters.set_defaults()
particles = datamodel.Particles(6)
particles.mass = nbody_system.mass.new_quantity(range(1,7))
particles.radius = 0.00001 | nbody_system.length
particles.position = [[-1.0,0.0,0.0],[1.0,0.0,0.0],[0.0,-1.0,0.0],[0.0,1.0,0.0],[0.0,0.0,-1.0],[0.0,0.0,1.0]] | nbody_system.length
particles.velocity = [[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0]] | nbody_system.speed
instance.particles.add_particles(particles)
instance.commit_particles()
copyof = instance.particles.copy()
self.assertEquals(2 | nbody_system.mass, copyof[1].mass)
instance.stop()
def test13(self):
particles = datamodel.Particles(2)
particles.x = [0.0,10.0] | nbody_system.length
particles.y = 0 | nbody_system.length
particles.z = 0 | nbody_system.length
particles.radius = 0.005 | nbody_system.length
particles.vx = 0 | nbody_system.speed
particles.vy = 0 | nbody_system.speed
particles.vz = 0 | nbody_system.speed
particles.mass = 1.0 | nbody_system.mass
instance = PhiGRAPE(**default_test_options)
instance.initialize_code()
instance.parameters.stopping_conditions_number_of_steps = 2
self.assertEquals(instance.parameters.stopping_conditions_number_of_steps, 2)
instance.parameters.epsilon_squared = (0.01 | nbody_system.length)**2
instance.particles.add_particles(particles)
instance.stopping_conditions.number_of_steps_detection.enable()
instance.evolve_model(10 | nbody_system.time)
self.assertTrue(instance.stopping_conditions.number_of_steps_detection.is_set())
self.assertTrue(instance.model_time < 10 | nbody_system.time)
instance.stop()
def new_instance_of_athena_and_nbody_code(self):
gridcode = Athena(redirection="none", number_of_workers=1)
gridcode.initialize_code()
gridcode.parameters.gamma = self.gamma
gridcode.parameters.courant_number = 0.3
gridcode.set_has_external_gravitational_potential(1)
nbodycode = PhiGRAPE(mode="gpu")
#nbodycode = Octgrav(mode="gpu")
nbodycode.initialize_code()
nbodycode.parameters.epsilon_squared = (
self.size / (10000.0 * self.number_of_grid_points))**2
nbodycode.commit_parameters()
result = HydroGridAndNbody(gridcode, nbodycode)
return result
def init_integrator(method):
if method == 'octgrav':
gravity = Octgrav()
elif method == 'ph4':
gravity = ph4()
elif method == 'fi':
gravity = Fi(convert_nbody)
gravity.initialize_code()
gravity.parameters.epsilon_squared = 0.00000001 | units.AU**2
gravity.parameters.timestep = .10 | units.day
elif method == 'phigrape':
gravity = PhiGRAPE(convert_nbody, mode=PhiGRAPEInterface.MODE_GPU)
elif method == 'bhtree':
gravity = BHTree(convert_nbody, number_of_workes=workers)
elif method == 'hermite':
gravity = Hermite(convert_nbody,
number_of_workers=workers
#debugger = "xterm",
#redirection = "none"
)
gravity.parameters.epsilon_squared = 0.00001 | units.AU**2
return gravity
def test13(self):
particles = datamodel.Particles(2)
particles.x = [0.0,10.0] | nbody_system.length
particles.y = 0 | nbody_system.length
particles.z = 0 | nbody_system.length
particles.radius = 0.005 | nbody_system.length
particles.vx = 0 | nbody_system.speed
particles.vy = 0 | nbody_system.speed
particles.vz = 0 | nbody_system.speed
particles.mass = 1.0 | nbody_system.mass
instance = PhiGRAPE(**default_test_options)
instance.initialize_code()
instance.parameters.stopping_conditions_number_of_steps = 2
self.assertEquals(instance.parameters.stopping_conditions_number_of_steps, 2)
instance.parameters.epsilon_squared = (0.01 | nbody_system.length)**2
instance.particles.add_particles(particles)
instance.stopping_conditions.number_of_steps_detection.enable()
instance.evolve_model(10 | nbody_system.time)
self.assertTrue(instance.stopping_conditions.number_of_steps_detection.is_set())
self.assertTrue(instance.model_time < 10 | nbody_system.time)
instance.stop()
def test5(self):
instance = PhiGRAPE(**default_test_options)
instance.initialize_code()
instance.parameters.set_defaults()
particles = datamodel.Particles(2)
particles.mass = [1.0, 1.0] | nbody_system.mass
particles.radius = [0.0001, 0.0001] | nbody_system.length
particles.position = [[0.0,0.0,0.0], [2.0,0.0,0.0]] | nbody_system.length
particles.velocity = [[0.0, 0.0, 0.0], [0.0, 0.0, 0.0]] | nbody_system.speed
instance.particles.add_particles(particles)
instance.commit_particles()
zero = 0.0 | nbody_system.length
fx, fy, fz = instance.get_gravity_at_point(zero, 1.0| nbody_system.length, zero, zero)
self.assertAlmostEqual(fx, 0.0 | nbody_system.acceleration, 3)
self.assertAlmostEqual(fy, 0.0 | nbody_system.acceleration, 3)
self.assertAlmostEqual(fz, 0.0 | nbody_system.acceleration, 3)
for x in (0.25, 0.5, 0.75):
x0 = x| nbody_system.length
x1 = (2.0 - x) | nbody_system.length
potential0 = instance.get_potential_at_point(zero, x0, zero, zero)
potential1 = instance.get_potential_at_point(zero, x1, zero, zero)
fx0, fy0, fz0 = instance.get_gravity_at_point(zero, x0, zero, zero)
fx1, fy1, fz1 = instance.get_gravity_at_point(zero, x1, zero, zero)
self.assertAlmostEqual(fy0, 0.0 | nbody_system.acceleration, 3)
self.assertAlmostEqual(fz0, 0.0 | nbody_system.acceleration, 3)
self.assertAlmostEqual(fy1, 0.0 | nbody_system.acceleration, 3)
self.assertAlmostEqual(fz1, 0.0 | nbody_system.acceleration, 3)
self.assertAlmostEqual(fx0, -1.0 * fx1, 5)
fx = (-1.0 / (x0**2) + 1.0 / (x1**2)) * (1.0 | nbody_system.length ** 3 / nbody_system.time ** 2)
self.assertAlmostEqual(fx, fx0, 2)
self.assertAlmostEqual(potential0, potential1, 5)
instance.stop()
def test17(self):
convert_nbody = nbody_system.nbody_to_si(1.0 | units.MSun, 149.5e6 | units.km)
instance = PhiGRAPE(convert_nbody, **default_test_options)
instance.initialize_code()
instance.parameters.set_defaults()
instance.parameters.initial_timestep_parameter = 0.001
instance.parameters.timestep_parameter = 0.001
instance.parameters.epsilon_squared = 0.0 | units.AU**2
stars = self.new_system_of_sun_and_earth()
earth = stars[1]
instance.particles.add_particles(stars)
instance.commit_particles()
position_at_start = earth.position.value_in(units.AU)[0]
print instance.particles[0].position.as_quantity_in(units.AU)
print instance.particles[1].position.as_quantity_in(units.AU)
instance.evolve_model(365 | units.day)
print instance.particles[0].position.as_quantity_in(units.AU)
print instance.particles[1].position.as_quantity_in(units.AU)
instance.particles.copy_values_of_all_attributes_to(stars)
position_after_full_rotation = earth.position.value_in(units.AU)[0]
self.assertAlmostEqual(position_at_start, position_after_full_rotation, 3)
print instance.particles[0].position.as_quantity_in(units.AU)
instance.evolve_model(365.0 + (365.0 / 2) | units.day)
print instance.particles[0].position.as_quantity_in(units.AU)
instance.particles.copy_values_of_all_attributes_to(stars)
position_after_half_a_rotation = earth.position.value_in(units.AU)[0]
self.assertAlmostEqual(-position_at_start, position_after_half_a_rotation, 2)
instance.evolve_model(365.0 + (365.0 / 2) + (365.0 / 4) | units.day)
instance.particles.copy_values_of_all_attributes_to(stars)
position_after_half_a_rotation = earth.position.value_in(units.AU)[1]
#self.assertAlmostEqual(-position_at_start, position_after_half_a_rotation, 3)
instance.cleanup_code()
instance.stop()
def test16(self):
instance = PhiGRAPE(number_of_workers = 2, **default_test_options)
instance.initialize_code()
instance.parameters.set_defaults()
print 1
particles = datamodel.Particles(2)
particles.x = [-1.0,1.0] | nbody_system.length
particles.y = 0 | nbody_system.length
particles.z = 0 | nbody_system.length
particles.radius = 0.005 | nbody_system.length
particles.vx = 0 | nbody_system.speed
particles.vy = 0 | nbody_system.speed
particles.vz = 0 | nbody_system.speed
particles.mass = [1.0, 0.5] | nbody_system.mass
instance.particles.add_particles(particles)
instance.commit_particles()
instance.evolve_model(0.01 | nbody_system.time)
instance.particles.copy_values_of_all_attributes_to(particles)
print instance.particles.position.x
self.assertAlmostRelativeEquals(instance.particles[0].position.x, -0.999984741095 | nbody_system.length, 8)
self.assertAlmostRelativeEquals(instance.particles[1].position.x, 0.999969482189 | nbody_system.length, 8)
instance.evolve_model(0.10 | nbody_system.time)
instance.particles.copy_values_of_all_attributes_to(particles)
print instance.particles.position.x
self.assertAlmostRelativeEquals(instance.particles[0].position.x, -0.999022960148 | nbody_system.length, 8)
self.assertAlmostRelativeEquals(instance.particles[1].position.x, 0.998045920305 | nbody_system.length, 8)
instance.evolve_model(0.50 | nbody_system.time)
instance.particles.copy_values_of_all_attributes_to(particles)
print instance.particles.position.x
self.assertAlmostRelativeEquals(instance.particles[0].position.x, -0.984250788742 | nbody_system.length, 8)
self.assertAlmostRelativeEquals(instance.particles[1].position.x, 0.968501583383 | nbody_system.length, 8)
instance.cleanup_code()
instance.stop()
def test15(self):
instance = PhiGRAPE(number_of_workers = 2, **default_test_options)#, redirection = "none")
instance.initialize_code()
instance.parameters.set_defaults()
print 1
particles = datamodel.Particles(2)
particles.x = [-1.0,1.0] | nbody_system.length
particles.y = 0 | nbody_system.length
particles.z = 0 | nbody_system.length
particles.radius = 0.005 | nbody_system.length
particles.vx = 0 | nbody_system.speed
particles.vy = 0 | nbody_system.speed
particles.vz = 0 | nbody_system.speed
particles.mass = 1.0 | nbody_system.mass
instance.particles.add_particles(particles)
instance.commit_particles()
instance.evolve_model(0.01 | nbody_system.time)
instance.particles.copy_values_of_all_attributes_to(particles)
print instance.particles.position.x
self.assertEquals(instance.particles[0].position.x, -instance.particles[1].position.x)
self.assertAlmostRelativeEquals(instance.particles[1].position.x, 0.999969482111 | nbody_system.length, 6)
instance.evolve_model(0.10 | nbody_system.time)
instance.particles.copy_values_of_all_attributes_to(particles)
print instance.particles.position.x
self.assertEquals(instance.particles[0].position.x, -instance.particles[1].position.x)
self.assertAlmostRelativeEquals(instance.particles[1].position.x, 0.99804560161 | nbody_system.length, 6)
instance.evolve_model(0.50 | nbody_system.time)
instance.particles.copy_values_of_all_attributes_to(particles)
print instance.particles.position.x
self.assertEquals(instance.particles[0].position.x, -instance.particles[1].position.x)
self.assertAlmostRelativeEquals(instance.particles[1].position.x, 0.968416814302 | nbody_system.length, 6)
instance.cleanup_code()
instance.stop()
def test2(self):
convert_nbody = nbody_system.nbody_to_si(1.0 | units.MSun, 149.5e6 | units.km)
instance = PhiGRAPE(convert_nbody, **default_test_options)
instance.initialize_code()
instance.parameters.set_defaults()
stars = self.new_system_of_sun_and_earth()
earth = stars[1]
instance.particles.add_particles(stars)
instance.commit_particles()
for x in range(1,365,30):
instance.evolve_model(x | units.day)
instance.particles.copy_values_of_all_attributes_to(stars)
stars.savepoint()
if HAS_MATPLOTLIB:
figure = pyplot.figure()
plot = figure.add_subplot(1,1,1)
x_points = earth.get_timeline_of_attribute("x")
y_points = earth.get_timeline_of_attribute("y")
x_points_in_AU = map(lambda (t,x) : x.value_in(units.AU), x_points)
y_points_in_AU = map(lambda (t,x) : x.value_in(units.AU), y_points)
plot.scatter(x_points_in_AU,y_points_in_AU, color = "b", marker = 'o')
plot.set_xlim(-1.5, 1.5)
plot.set_ylim(-1.5, 1.5)
test_results_path = self.get_path_to_results()
output_file = os.path.join(test_results_path, "phiGRAPE-earth-sun2.svg")
figure.savefig(output_file)
instance.cleanup_code()
instance.stop()
def simulate_small_cluster(number_of_stars,
end_time=40 | units.Myr,
name_of_the_figure="test-2.svg"):
random.seed()
salpeter_masses = new_salpeter_mass_distribution(number_of_stars)
total_mass = salpeter_masses.sum()
convert_nbody = nbody_system.nbody_to_si(total_mass, 1.0 | units.parsec)
convert_nbody.set_as_default()
particles = new_plummer_model(number_of_stars, convert_nbody)
gravity = PhiGRAPE(convert_nbody, mode="gpu")
gravity.initialize_code()
gravity.parameters.timestep_parameter = 0.01
gravity.parameters.initial_timestep_parameter = 0.01
gravity.parameters.epsilon_squared = 0.000001 | units.parsec**2
stellar_evolution = SSE()
stellar_evolution.initialize_module_with_default_parameters()
#print "setting masses of the stars"
particles.radius = 0.0 | units.RSun
#comment out to get plummer masses
particles.mass = salpeter_masses
gravity.particles.add_particles(particles)
gravity.initialize_particles(0.0)
from_model_to_gravity = particles.new_channel_to(gravity.particles)
from_gravity_to_model = gravity.particles.new_channel_to(particles)
time = 0.0 | units.Myr
particles.savepoint(time)
move_particles_to_center_of_mass(particles)
kineticEnergy = gravity.kinetic_energy.value_in(units.J)
potentialEnergy = gravity.potential_energy.value_in(units.J)
ToverV = kineticEnergy / potentialEnergy
file.write(str(time.value_in(units.Myr)))
file.write(' ')
file.write(str(ToverV))
file.write('\n')
while time < end_time:
time += 0.25 | units.Myr
gravity.evolve_model(time)
from_gravity_to_model.copy()
print "Evolved model to t =", str(time)
print "Evolved model to t =", str(
convert_nbody.to_nbody(time.value_in(units.Myr) | units.Myr))
kineticEnergy = gravity.kinetic_energy.value_in(units.J)
potentialEnergy = gravity.potential_energy.value_in(units.J)
ToverV = kineticEnergy / potentialEnergy
print "Kin / Pot =", ToverV
#print "Particle Mass =", particles[1].mass
file.write(str(time.value_in(units.Myr)))
file.write(' ')
file.write(str(ToverV))
file.write('\n')
file.close()
if os.path.exists('small.hdf5'):
os.remove('small.hdf5')
storage = store.StoreHDF("small.hdf5")
storage.store(particles)
del gravity
del stellar_evolution
def test2(self):
instance = PhiGRAPE()
self._run_addition_removal_test(instance)
def test15(self):
instance = PhiGRAPE(number_of_workers = 2, **default_test_options)#, redirection = "none")
instance.initialize_code()
instance.parameters.set_defaults()
print 1
particles = datamodel.Particles(2)
particles.x = [-1.0,1.0] | nbody_system.length
particles.y = 0 | nbody_system.length
particles.z = 0 | nbody_system.length
particles.radius = 0.005 | nbody_system.length
particles.vx = 0 | nbody_system.speed
particles.vy = 0 | nbody_system.speed
particles.vz = 0 | nbody_system.speed
particles.mass = 1.0 | nbody_system.mass
instance.particles.add_particles(particles)
instance.commit_particles()
instance.evolve_model(0.01 | nbody_system.time)
instance.particles.copy_values_of_all_attributes_to(particles)
print instance.particles.position.x
self.assertEquals(instance.particles[0].position.x, -instance.particles[1].position.x)
self.assertAlmostRelativeEquals(instance.particles[1].position.x, 0.999969482111 | nbody_system.length, 6)
instance.evolve_model(0.10 | nbody_system.time)
instance.particles.copy_values_of_all_attributes_to(particles)
print instance.particles.position.x
self.assertEquals(instance.particles[0].position.x, -instance.particles[1].position.x)
self.assertAlmostRelativeEquals(instance.particles[1].position.x, 0.99804560161 | nbody_system.length, 6)
instance.evolve_model(0.50 | nbody_system.time)
instance.particles.copy_values_of_all_attributes_to(particles)
print instance.particles.position.x
self.assertEquals(instance.particles[0].position.x, -instance.particles[1].position.x)
self.assertAlmostRelativeEquals(instance.particles[1].position.x, 0.968416814302 | nbody_system.length, 6)
instance.cleanup_code()
instance.stop()
def test9(self):
convert_nbody = nbody_system.nbody_to_si(1.0 | units.MSun, 149.5e6 | units.km)
instance = PhiGRAPE(convert_nbody, **default_test_options)#, debugger="xterm")
instance.initialize_code()
instance.parameters.set_defaults()
instance.parameters.initialize_gpu_once = 1
stars = self.new_system_of_sun_and_earth()
earth = stars[1]
instance.particles.add_particles(stars)
instance.commit_particles()
instance.evolve_model(365 | units.day)
instance.particles.copy_values_of_all_attributes_to(stars)
position_at_start = earth.position.value_in(units.AU)[0]
position_after_full_rotation = earth.position.value_in(units.AU)[0]
self.assertAlmostEqual(position_at_start, position_after_full_rotation, 6)
instance.evolve_model(365.0 + (365.0 / 2) | units.day)
instance.particles.copy_values_of_all_attributes_to(stars)
position_after_half_a_rotation = earth.position.value_in(units.AU)[0]
self.assertAlmostEqual(-position_at_start, position_after_half_a_rotation, 2)
instance.evolve_model(365.0 + (365.0 / 2) + (365.0 / 4) | units.day)
instance.particles.copy_values_of_all_attributes_to(stars)
position_after_half_a_rotation = earth.position.value_in(units.AU)[1]
#self.assertAlmostEqual(-position_at_start, position_after_half_a_rotation, 3)
instance.cleanup_code()
instance.stop()
def test8(self):
particles = datamodel.Particles(6)
particles.mass = nbody_system.mass.new_quantity(range(1,7))
particles.radius = 0.00001 | nbody_system.length
particles.position = [[-1.0,0.0,0.0],[1.0,0.0,0.0],[0.0,-1.0,0.0],[0.0,1.0,0.0],[0.0,0.0,-1.0],[0.0,0.0,1.0]] | nbody_system.length
particles.velocity = [[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0]] | nbody_system.speed
for current_mode in ['g6lib','gpu','grape']:
try:
instance = PhiGRAPE(mode = current_mode)
except:
print "Running PhiGRAPE with mode=" + current_mode, "was unsuccessful."
else:
print "Running PhiGRAPE with mode=" + current_mode + "...",
instance.initialize_code()
instance.particles.add_particles(particles)
instance.commit_particles()
instance.evolve_model(0.1 | nbody_system.time)
instance.cleanup_code()
instance.stop()
print "ok"
def test16(self):
instance = PhiGRAPE(number_of_workers = 2, **default_test_options)
instance.initialize_code()
instance.parameters.set_defaults()
print 1
particles = datamodel.Particles(2)
particles.x = [-1.0,1.0] | nbody_system.length
particles.y = 0 | nbody_system.length
particles.z = 0 | nbody_system.length
particles.radius = 0.005 | nbody_system.length
particles.vx = 0 | nbody_system.speed
particles.vy = 0 | nbody_system.speed
particles.vz = 0 | nbody_system.speed
particles.mass = [1.0, 0.5] | nbody_system.mass
instance.particles.add_particles(particles)
instance.commit_particles()
instance.evolve_model(0.01 | nbody_system.time)
instance.particles.copy_values_of_all_attributes_to(particles)
print instance.particles.position.x
self.assertAlmostRelativeEquals(instance.particles[0].position.x, -0.999984741095 | nbody_system.length, 8)
self.assertAlmostRelativeEquals(instance.particles[1].position.x, 0.999969482189 | nbody_system.length, 8)
instance.evolve_model(0.10 | nbody_system.time)
instance.particles.copy_values_of_all_attributes_to(particles)
print instance.particles.position.x
self.assertAlmostRelativeEquals(instance.particles[0].position.x, -0.999022960148 | nbody_system.length, 8)
self.assertAlmostRelativeEquals(instance.particles[1].position.x, 0.998045920305 | nbody_system.length, 8)
instance.evolve_model(0.50 | nbody_system.time)
instance.particles.copy_values_of_all_attributes_to(particles)
print instance.particles.position.x
self.assertAlmostRelativeEquals(instance.particles[0].position.x, -0.984250788742 | nbody_system.length, 8)
self.assertAlmostRelativeEquals(instance.particles[1].position.x, 0.968501583383 | nbody_system.length, 8)
instance.cleanup_code()
instance.stop()
def test17(self):
convert_nbody = nbody_system.nbody_to_si(1.0 | units.MSun, 149.5e6 | units.km)
instance = PhiGRAPE(convert_nbody, **default_test_options)
instance.initialize_code()
instance.parameters.set_defaults()
instance.parameters.initial_timestep_parameter = 0.001
instance.parameters.timestep_parameter = 0.001
instance.parameters.epsilon_squared = 0.0 | units.AU**2
stars = self.new_system_of_sun_and_earth()
earth = stars[1]
instance.particles.add_particles(stars)
instance.commit_particles()
position_at_start = earth.position.value_in(units.AU)[0]
print instance.particles[0].position.as_quantity_in(units.AU)
print instance.particles[1].position.as_quantity_in(units.AU)
instance.evolve_model(365 | units.day)
print instance.particles[0].position.as_quantity_in(units.AU)
print instance.particles[1].position.as_quantity_in(units.AU)
instance.particles.copy_values_of_all_attributes_to(stars)
position_after_full_rotation = earth.position.value_in(units.AU)[0]
self.assertAlmostEqual(position_at_start, position_after_full_rotation, 3)
print instance.particles[0].position.as_quantity_in(units.AU)
instance.evolve_model(365.0 + (365.0 / 2) | units.day)
print instance.particles[0].position.as_quantity_in(units.AU)
instance.particles.copy_values_of_all_attributes_to(stars)
position_after_half_a_rotation = earth.position.value_in(units.AU)[0]
self.assertAlmostEqual(-position_at_start, position_after_half_a_rotation, 2)
instance.evolve_model(365.0 + (365.0 / 2) + (365.0 / 4) | units.day)
instance.particles.copy_values_of_all_attributes_to(stars)
position_after_half_a_rotation = earth.position.value_in(units.AU)[1]
#self.assertAlmostEqual(-position_at_start, position_after_half_a_rotation, 3)
instance.cleanup_code()
instance.stop()
def simulate_small_cluster(number_of_stars,
end_time=40 | units.Myr,
name_of_the_figure="test-2.svg"):
random.seed()
salpeter_masses = new_salpeter_mass_distribution(number_of_stars)
total_mass = salpeter_masses.sum()
convert_nbody = nbody_system.nbody_to_si(total_mass, 1.0 | units.parsec)
convert_nbody.set_as_default()
print 'end_time:', convert_nbody.to_nbody(end_time)
print convert_nbody.to_nbody(total_mass)
particles = new_plummer_model(number_of_stars, convert_nbody)
gravity = PhiGRAPE(convert_nbody, mode="gpu", use_gl="true")
gravity.parameters.timestep_parameter = 0.01
gravity.parameters.initial_timestep_parameter = 0.01
gravity.parameters.epsilon_squared = 0.0015 | units.parsec**2
particles.radius = 0.0 | units.RSun
# particles.mass = salpeter_masses
move_particles_to_center_of_mass(particles)
gravity.particles.add_particles(particles)
gravity.initialize_particles(0.0)
gravity.start_viewer()
from_model_to_gravity = particles.new_channel_to(gravity.particles)
from_gravity_to_model = gravity.particles.new_channel_to(particles)
time = 0.0 | units.Myr
# particles.savepoint(time)
kineticEnergy = gravity.kinetic_energy.value_in(units.J)
potentialEnergy = gravity.potential_energy.value_in(units.J)
ToverV = kineticEnergy / potentialEnergy
E0 = convert_nbody.to_nbody(gravity.kinetic_energy +
gravity.potential_energy)
file.write(str(time.value_in(units.Myr)))
file.write(' ')
file.write(str(ToverV))
file.write('\n')
gravity.parameters.timestep_parameter = 0.01
gravity.parameters.initial_timestep_parameter = 0.01
while time < end_time:
time += 0.5 * convert_nbody.to_si(1 | nbody_system.time)
gravity.evolve_model(time)
gravity.synchronize_model()
from_gravity_to_model.copy()
print "Evolved model to t =", str(time)
kineticEnergy = gravity.kinetic_energy.value_in(units.J)
potentialEnergy = gravity.potential_energy.value_in(units.J)
ToverV = kineticEnergy / potentialEnergy
Et = convert_nbody.to_nbody(gravity.kinetic_energy +
gravity.potential_energy)
print "Kin / Pot =", ToverV, (Et - E0) / E0
file.write(str(time.value_in(units.Myr)))
file.write(' ')
file.write(str(ToverV))
file.write('\n')
file.close()
if os.path.exists('small.hdf5'):
os.remove('small.hdf5')
storage = store.StoreHDF("small.hdf5")
storage.store(particles)
del gravity
del stellar_evolution
orbit_frac = 0.5
print "orbit_frac=%s" % (orbit_frac, )
# case 1: central body with an orbiting planet
T = two_body_orbital_period(m1=1 / 20000, m2=10e-10, a=4.8481e-6, e=0.5)
print "two_body_central period=%s" % (T, )
r = nbe.NBodyComputation(initialConditions=two_body_initial_conditions(
m1=1 / 20000, m2=10e-10, a=4.8481e-6, e=0.5),
dt=T / 100 | nbody_system.time,
tFinal=orbit_frac * T | nbody_system.time,
analyticSolution=None,
ndim=2,
outfName="two_body_central")
# run the problem on two integrators
r.runProblemOnIntegrator(PhiGRAPE(), label="PhiGRAPE", printProgress=False)
r.runProblemOnIntegrator(Hermite(), label="Hermite", printProgress=False)
hc = huayno_cc.Huayno(redirection='none')
hc.initialize_code()
hc.set_inttype_parameter(huayno_cc.Huayno.EVOLVE_HOLD_DKD_CC)
hc.set_timestep_parameter(0.01)
r.runProblemOnIntegrator(hc, label="Huayno_CC", printProgress=False)
# plot a comparison in energy
r.plotTotalEnergyRelativeError(labels=["PhiGRAPE", "Hermite", "Huayno_CC"])
# plot trajectories
r.plotTrajectories(label="PhiGRAPE")
r.plotTrajectories(label="Hermite")
r.plotTrajectories(label="Huayno_CC")
def test2(self):
convert_nbody = nbody_system.nbody_to_si(1.0 | units.MSun, 149.5e6 | units.km)
instance = PhiGRAPE(convert_nbody, **default_test_options)
instance.initialize_code()
instance.parameters.set_defaults()
stars = self.new_system_of_sun_and_earth()
earth = stars[1]
instance.particles.add_particles(stars)
instance.commit_particles()
for x in range(1,365,30):
instance.evolve_model(x | units.day)
instance.particles.copy_values_of_all_attributes_to(stars)
stars.savepoint()
if HAS_MATPLOTLIB:
figure = pyplot.figure()
plot = figure.add_subplot(1,1,1)
x_points = earth.get_timeline_of_attribute("x")
y_points = earth.get_timeline_of_attribute("y")
x_points_in_AU = map(lambda (t,x) : x.value_in(units.AU), x_points)
y_points_in_AU = map(lambda (t,x) : x.value_in(units.AU), y_points)
plot.scatter(x_points_in_AU,y_points_in_AU, color = "b", marker = 'o')
plot.set_xlim(-1.5, 1.5)
plot.set_ylim(-1.5, 1.5)
test_results_path = self.get_path_to_results()
output_file = os.path.join(test_results_path, "phiGRAPE-earth-sun2.svg")
figure.savefig(output_file)
instance.cleanup_code()
instance.stop()
def new_gravity_code(converter, timestep=0.0025 | units.Myr):
result = PhiGRAPE(converter)
result.parameters.epsilon_squared = (0.01 | units.parsec)**2
return result
def test9(self):
convert_nbody = nbody_system.nbody_to_si(1.0 | units.MSun, 149.5e6 | units.km)
instance = PhiGRAPE(convert_nbody, **default_test_options)#, debugger="xterm")
instance.initialize_code()
instance.parameters.set_defaults()
instance.parameters.initialize_gpu_once = 1
stars = self.new_system_of_sun_and_earth()
earth = stars[1]
instance.particles.add_particles(stars)
instance.commit_particles()
instance.evolve_model(365 | units.day)
instance.particles.copy_values_of_all_attributes_to(stars)
position_at_start = earth.position.value_in(units.AU)[0]
position_after_full_rotation = earth.position.value_in(units.AU)[0]
self.assertAlmostEqual(position_at_start, position_after_full_rotation, 6)
instance.evolve_model(365.0 + (365.0 / 2) | units.day)
instance.particles.copy_values_of_all_attributes_to(stars)
position_after_half_a_rotation = earth.position.value_in(units.AU)[0]
self.assertAlmostEqual(-position_at_start, position_after_half_a_rotation, 2)
instance.evolve_model(365.0 + (365.0 / 2) + (365.0 / 4) | units.day)
instance.particles.copy_values_of_all_attributes_to(stars)
position_after_half_a_rotation = earth.position.value_in(units.AU)[1]
#self.assertAlmostEqual(-position_at_start, position_after_half_a_rotation, 3)
instance.cleanup_code()
instance.stop()
sat_two = stars[2]
sat_two.mass = units.kg(1000)
sat_two.radius = units.m(10)
sat_two.position = units.km(np.array((6371 + 242, 100.0, 0.0)))
sat_two.velocity = units.ms(np.array((0.0, 27359 / 3.6, 0.0)))
convert_nbody = nbody_system.nbody_to_si(5.9736e24 | units.kg,
6371 | units.km)
s = Viewer(stars, (640, 480), convert_nbody)
#stars.scale_to_standard()
if method == 'octgrav':
gravity = Octgrav()
elif method == 'phigrape':
gravity = PhiGRAPE(convert_nbody)
elif method == 'bhtree':
gravity = BHTree(convert_nbody, number_of_workes=workers)
elif method == 'hermite':
gravity = Hermite(convert_nbody,
number_of_workers=workers
#debugger = "xterm",
#redirection = "none"
)
gravity.initialize_code()
gravity.parameters.epsilon_squared = 0.001 | nbody_system.length**2
#stars.radius = 0.000001 | nbody_system.length
gravity.particles.add_particles(stars)
#gravity.stopping_conditions.pair_detection.enable()
from_model_to_gravity = stars.new_channel_to(gravity.particles)
def test8(self):
particles = datamodel.Particles(6)
particles.mass = nbody_system.mass.new_quantity(range(1,7))
particles.radius = 0.00001 | nbody_system.length
particles.position = [[-1.0,0.0,0.0],[1.0,0.0,0.0],[0.0,-1.0,0.0],[0.0,1.0,0.0],[0.0,0.0,-1.0],[0.0,0.0,1.0]] | nbody_system.length
particles.velocity = [[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0]] | nbody_system.speed
for current_mode in ['g6lib','gpu','grape']:
try:
instance = PhiGRAPE(mode = current_mode)
except:
print "Running PhiGRAPE with mode=" + current_mode, "was unsuccessful."
else:
print "Running PhiGRAPE with mode=" + current_mode + "...",
instance.initialize_code()
instance.particles.add_particles(particles)
instance.commit_particles()
instance.evolve_model(0.1 | nbody_system.time)
instance.cleanup_code()
instance.stop()
print "ok"
ZC = ZRES / 2.0
if __name__ == "__main__":
nstars = int(sys.argv[1])
workers = int(sys.argv[2])
method = sys.argv[3]
print nstars
seed = None
stars = new_plummer_model(
nstars) #, convert_nbody, random_state = seed).result
if method == 'octgrav':
gravity = Octgrav()
elif method == 'phigrape':
gravity = PhiGRAPE(PhiGRAPE.NBODY)
elif method == 'bhtree':
gravity = BHTree(number_of_workes=workers)
elif method == 'hermite':
gravity = Hermite(number_of_workers=workers
#debugger = "xterm",
#redirection = "none"
)
gravity.initialize_code()
gravity.parameters.epsilon_squared = 0.001 | nbody_system.length**2
stars.radius = 0.000001 | nbody_system.length
gravity.particles.add_particles(stars)
gravity.stopping_conditions.pair_detection.enable()
from_model_to_gravity = stars.new_channel_to(gravity.particles)
from_gravity_to_model = gravity.particles.new_channel_to(stars)
if __name__ in ('__main__', '__plot__'):
# set up parameters:
N = 100
W0 = 3
Rinit = 50. | units.parsec
timestep = 0.01 | units.Myr
Mcluster = 4.e4 | units.MSun
Rcluster = 0.7 | units.parsec
converter = nbody_system.nbody_to_si(Mcluster,Rcluster)
# create a globular cluster model
particles = new_king_model(N, W0, convert_nbody=converter)
particles.radius = 0.0| units.parsec
cluster = PhiGRAPE(converter, parameters=[("epsilon_squared", (0.01 | units.parsec)**2)])
# create the external potential of the Galaxy
galaxy = Agama(converter, type="Dehnen", gamma=1.8, \
rscale=1000.| units.parsec, mass=1.6e10 | units.MSun, channel_type='sockets')
# shift the cluster to an orbit around Galactic center
acc,_,_ = galaxy.get_gravity_at_point(0|units.kpc, Rinit, 0|units.kpc, 0|units.kpc)
vcirc = (-acc * Rinit)**0.5
print "Vcirc=", vcirc.value_in(units.kms), "km/s"
particles.x += Rinit
particles.vy += vcirc
cluster.particles.add_particles(particles)
# set up bridge; cluster is evolved under influence of the galaxy
sys = bridge(verbose=False)
