def test5(self):
print("Test group_bound_particles")
colliders = self.new_colliders()
colliders.position = [[0.0, 0.0, 0.0], [1.1, 0.0, 0.0]] | units.RSun
colliders.velocity = [[0.0, 0.0, 0.0], [10000, 0.0, 0.0]] | units.km / units.s
stellar = EVtwin()
stellar.particles.add_particles(colliders)
collision = StellarEncounterInHydrodynamics(7000, None, relax_sph_models=False, verbose=True,
star_to_sph_arguments=dict(base_grid_options=dict(type="sobol")))
collision.dynamical_timescale = zero
gas_particles = collision.convert_stars(colliders, stellar)
stellar.stop()
collision.hop = collision.new_hop(gas_particles)
collision.start_kepler(7 | units.MSun, 10 | units.RSun)
self.assertTrue(collision.encounter_is_over(gas_particles))
collision.hop.stop()
collision.kepler.stop()
groups = collision.groups_after_encounter
self.assertEqual(len(groups), 2)
self.assertTrue(4500 < len(groups[0]) < 5000)
self.assertTrue(1800 < len(groups[1]) < 2000)
self.assertEqual(len(gas_particles - groups[0] - groups[1]), 346)
self.assertAlmostEqual(groups[0].center_of_mass()[0], 0 | units.RSun, 1)
self.assertAlmostEqual(groups[1].center_of_mass()[0], 1.1 | units.RSun, 0)
self.assertIsOfOrder(groups[1].center_of_mass_velocity()[0], 10000 | units.km / units.s)
def test5(self):
print "Test group_bound_particles"
colliders = self.new_colliders()
colliders.position = [[0.0, 0.0, 0.0], [1.1, 0.0, 0.0]] | units.RSun
colliders.velocity = [[0.0, 0.0, 0.0], [10000, 0.0, 0.0]] | units.km / units.s
stellar = EVtwin()
stellar.particles.add_particles(colliders)
collision = StellarEncounterInHydrodynamics(7000, None, relax_sph_models=False, verbose=True,
star_to_sph_arguments=dict(base_grid_options=dict(type="sobol")))
collision.dynamical_timescale = zero
gas_particles = collision.convert_stars(colliders, stellar)
stellar.stop()
collision.hop = collision.new_hop(gas_particles)
collision.start_kepler(7 | units.MSun, 10 | units.RSun)
self.assertTrue(collision.encounter_is_over(gas_particles))
collision.hop.stop()
collision.kepler.stop()
groups = collision.groups_after_encounter
self.assertEqual(len(groups), 2)
self.assertTrue(4500 < len(groups[0]) < 5000)
self.assertTrue(1800 < len(groups[1]) < 2000)
self.assertEqual(len(gas_particles - groups[0] - groups[1]), 346)
self.assertAlmostEqual(groups[0].center_of_mass()[0], 0 | units.RSun, 1)
self.assertAlmostEqual(groups[1].center_of_mass()[0], 1.1 | units.RSun, 0)
self.assertIsOfOrder(groups[1].center_of_mass_velocity()[0], 10000 | units.km / units.s)
def test4(self):
print "Test binary_will_collide"
collision = StellarEncounterInHydrodynamics(None, None, verbose=True)
collision.dynamical_timescale = zero
collision.start_kepler(7 | units.MSun, 10 | units.RSun)
# at periastron, close enough:
colliders = self.new_colliders()
colliders.radius = 1 | units.RSun
self.assertTrue(
collision.binary_will_collide(colliders[0], colliders[1]))
# at periastron, distance too large:
colliders.radius = 0.4 | units.RSun
self.assertFalse(
collision.binary_will_collide(colliders[0], colliders[1]))
# at apastron, will collide at periastron:
colliders.velocity = [[0.0, 0.0, 0.0], [0.0, 1000.0, 0.0]
] | units.km / units.s
self.assertTrue(
collision.binary_will_collide(colliders[0], colliders[1]))
# hyperbolic orbits, moving away from each other:
colliders.position = [[0.0, 0.0, 0.0], [1.0, 100.0, 0.0]] | units.RSun
self.assertFalse(
collision.binary_will_collide(colliders[0], colliders[1]))
# hyperbolic orbits, moving towards each other:
colliders.velocity = [[0.0, 0.0, 0.0], [0.0, -1000.0, 0.0]
] | units.km / units.s
self.assertTrue(
collision.binary_will_collide(colliders[0], colliders[1]))
collision.kepler.stop()
def test4(self):
print "Test binary_will_collide"
collision = StellarEncounterInHydrodynamics(None, None, verbose=True)
collision.dynamical_timescale = zero
collision.start_kepler(7 | units.MSun, 10 | units.RSun)
# at periastron, close enough:
colliders = self.new_colliders()
colliders.radius = 1 | units.RSun
self.assertTrue(collision.binary_will_collide(colliders[0], colliders[1]))
# at periastron, distance too large:
colliders.radius = 0.4 | units.RSun
self.assertFalse(collision.binary_will_collide(colliders[0], colliders[1]))
# at apastron, will collide at periastron:
colliders.velocity = [[0.0, 0.0, 0.0], [0.0, 1000.0, 0.0]] | units.km / units.s
self.assertTrue(collision.binary_will_collide(colliders[0], colliders[1]))
# hyperbolic orbits, moving away from each other:
colliders.position = [[0.0, 0.0, 0.0], [1.0, 100.0, 0.0]] | units.RSun
self.assertFalse(collision.binary_will_collide(colliders[0], colliders[1]))
# hyperbolic orbits, moving towards each other:
colliders.velocity = [[0.0, 0.0, 0.0], [0.0, -1000.0, 0.0]] | units.km / units.s
self.assertTrue(collision.binary_will_collide(colliders[0], colliders[1]))
collision.kepler.stop()