def test_second_pass_reflection_serial(self):
# create particle in center of lower left quadrant
particles = HydroParticleCreator(num=1, dim=2)
particles['position-x'][0] = 0.25
particles['position-y'][0] = 0.25
# create unit square domain
self.domain_manager.set_domain(DomainLimits())
self.domain_manager.register_fields(particles)
self.domain_manager.set_boundary_condition(Reflective())
mesh = Mesh()
mesh.register_fields(particles)
mesh.initialize()
# set infinte radius flag FIX add variable instead of magic number
particles['radius'][0] = -1
self.domain_manager.setup_for_ghost_creation(particles)
self.domain_manager.create_ghost_particles(particles)
# two ghost particles created
self.assertTrue(particles.get_carray_size() == 3)
particles['radius'][0] = 0.6
self.domain_manager.update_search_radius(particles)
self.domain_manager.create_ghost_particles(particles)
# no new ghost should be created
self.assertTrue(particles.get_carray_size() == 3)
def test_setup_for_ghost_creation_reflection(self):
# create particle in center of lower left quadrant
particles = HydroParticleCreator(num=1, dim=2)
particles['position-x'][0] = 0.25
particles['position-y'][0] = 0.25
# create unit square domain
self.domain_manager.set_domain(DomainLimits())
self.domain_manager.register_fields(particles)
self.domain_manager.set_boundary_condition(Reflective())
mesh = Mesh()
mesh.register_fields(particles)
mesh.initialize()
# set infinte radius flag FIX add variable instead of magic number
particles['radius'][0] = -1
self.domain_manager.setup_for_ghost_creation(particles)
self.domain_manager.create_ghost_particles(particles)
# two ghost particles created
self.assertTrue(particles.get_carray_size() == 3)
# two ghost particles should of been created
# first particle reflected across x-min
self.assertEqual(particles['position-x'][1], -0.25)
self.assertEqual(particles['position-y'][1], 0.25)
# second particle reflected across y-min
self.assertEqual(particles['position-x'][2], 0.25)
self.assertEqual(particles['position-y'][2], -0.25)
# should have particle in flagged buffer
self.assertFalse(self.domain_manager.ghost_complete())
# update search radius to remove particle from being flagged
particles['radius'][1:] = 0.3
self.domain_manager.update_search_radius(particles)
self.assertTrue(self.domain_manager.ghost_complete())
class TestMesh2dLatticeBox(unittest.TestCase):
def setUp(self):
nx = ny = 10
n = nx * nx
self.particles = HydroParticleCreator(num=n, dim=2)
# create lattice particles in a unit box
L = 1.
dx = L / nx
dy = L / ny
self.volume = dx * dy
part = 0
for i in range(nx):
for j in range(ny):
self.particles['position-x'][part] = (i + 0.5) * dx
self.particles['position-y'][part] = (j + 0.5) * dy
part += 1
# create unit square domain, reflective boundary condition
minx = np.array([0., 0.])
maxx = np.array([1., 1.])
self.domain_manager = DomainManager(initial_radius=0.1,
search_radius_factor=1.25)
self.domain_manager.set_domain_limits(DomainLimits(minx, maxx))
self.domain_manager.register_fields(self.particles)
self.domain_manager.set_boundary_condition(Reflective())
self.domain_manager.initialize()
self.mesh = Mesh()
self.mesh.register_fields(self.particles)
self.mesh.initialize()
def test_volume(self):
"""
Test if particle volumes in a square are created correctly.
Create grid of particles in a unit box, total volume is 1.0.
"""
# generate voronoi mesh
self.mesh.build_geometry(self.particles, self.domain_manager)
# sum voronoi volumes of all real particles
real_indices = self.particles["tag"] == ParticleTAGS.Real
tot_vol = np.sum(self.particles["volume"][real_indices])
# total mass should be equal to the volume of the box
self.assertAlmostEqual(tot_vol, 1.0)
def test_center_of_mass(self):
"""
Test if particle center of mass positions are created correctly.
Particles are placed in a uniform lattice. Therefore the center
of mass is the same as particle positions.
"""
# generate voronoi mesh
self.mesh.build_geometry(self.particles, self.domain_manager)
dim = len(self.particles.carray_named_groups["position"])
axis = "xyz"[:dim]
# check if particle position is the same as center of mass
for i in range(self.particles.get_carray_size()):
if self.particles["tag"][i] == ParticleTAGS.Real:
for ax in axis:
self.assertAlmostEqual(0., self.particles["dcom-" + ax][i])
def test_particle_volume(self):
"""
Test if particle center of mass positions are created correctly.
Particles are placed in a uniform lattice. Therefore the center
of mass is the same as particle positions.
"""
# generate voronoi mesh
self.mesh.build_geometry(self.particles, self.domain_manager)
# check if particle position is the same as center of mass
for i in range(self.particles.get_carray_size()):
if self.particles["tag"][i] == ParticleTAGS.Real:
self.assertAlmostEqual(self.volume,
self.particles["volume"][i])