class TestMesh2dUniformBox(unittest.TestCase):
def setUp(self):
n = 100
self.particles = HydroParticleCreator(num=n, dim=2)
# create uniform random particles in a unit box
np.random.seed(0)
self.particles["position-x"][:] = np.random.uniform(size=n)
self.particles["position-y"][:] = np.random.uniform(size=n)
# 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)
# calculate 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)
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])