def load(self):
# Convert mesh from MSH to Dolfin-XML
shutil.copyfile("input/%s.msh" % input_mesh, "%s.msh" % input_mesh)
destination_xml = "%s.xml" % input_mesh
subprocess.call(
["dolfin-convert",
"%s.msh" % input_mesh, destination_xml])
# Load mesh and boundaries
mesh = d.Mesh(destination_xml)
self.patches = d.MeshFunction("size_t", mesh,
"%s_facet_region.xml" % input_mesh)
self.subdomains = d.MeshFunction("size_t", mesh,
"%s_physical_region.xml" % input_mesh)
# Define differential over subdomains
self.dxs = d.dx[self.subdomains]
# Turn subdomains into a Numpy array
self.subdomains_array = N.asarray(self.subdomains.array(),
dtype=N.int32)
# Create a map from subdomain indices to tissues
self.tissues_by_subdomain = {}
for i, t in v.tissues.items():
print(i, t)
for j in t["indices"]:
self.tissues_by_subdomain[j] = t
self.mesh = mesh
self.setup_fe()
self.prepare_increase_conductivity()
def SetupUnitMeshHelper(mesh, V=None, Vc=None):
if V is None:
V = df.FunctionSpace(mesh, 'CG', 1)
if Vc is None:
Vc = df.FunctionSpace(mesh, 'DG', 0)
boundaries = dict()
boundaries['left'] = df.CompiledSubDomain("near(x[0], 0.0) && on_boundary")
boundaries['bottom'] = df.CompiledSubDomain(
"near(x[1], 0.0) && on_boundary")
boundaries['top'] = df.CompiledSubDomain("near(x[1], 1.0) && on_boundary")
boundaries['right'] = df.CompiledSubDomain(
"near(x[0], 1.0) && on_boundary")
boundarymarkers = df.MeshFunction('size_t', mesh,
mesh.topology().dim() - 1, 0)
boundarymarkers.set_all(0)
domainmarkers = df.MeshFunction('size_t', mesh, mesh.topology().dim(), 0)
boundaries['left'].mark(boundarymarkers, 1)
boundaries['bottom'].mark(boundarymarkers, 2)
boundaries['right'].mark(boundarymarkers, 3)
boundaries['top'].mark(boundarymarkers, 4)
ds = df.Measure('ds', domain=mesh, subdomain_data=boundarymarkers)
dx = df.Measure('dx', domain=mesh, subdomain_data=domainmarkers)
return boundaries, boundarymarkers, domainmarkers, dx, ds, V, Vc
def meshReader(dictMesh):
''' converts json mesh to fenics mesh and apply the boundary conditions.
dict:: dictMesh, the mesh from database in the form of a python dictionary
output:
dolfin.ccp.mesh:: feMesh, mesh defined in fenics object
'''
# conver dict to object
mesh = namedtuple("mesh", dictMesh.keys())(*dictMesh.values())
nodes = np.array(mesh.nodes)
cells = np.array(mesh.connectivity, dtype=np.uintp)
feMesh = fn.Mesh()
editor = fn.MeshEditor()
# cell type, topological, and geometrical dimensions. i.e. 2, 3 for 3d surface mesh
editor.open(feMesh, "triangle", 2, 3)
# cell types available: point, interval, triangle, quadrilateral, tetrahedron, hexahedron
editor.init_vertices(len(mesh.nodes))
editor.init_cells(len(mesh.connectivity))
[editor.add_vertex(i, n) for i, n in enumerate(nodes)]
[editor.add_cell(i, n - 1) for i, n in enumerate(cells)]
editor.close()
# construct faces
faceSets = fn.MeshFunction('size_t', feMesh, 2)
for face, faceCells in mesh.faces.items():
for index in faceCells:
faceSets.set_value(index, int(face), feMesh)
# construct edges
edgeSets = fn.MeshFunction('size_t', feMesh, 1)
meshEdges = {}
for edge in fn.edges(feMesh):
meshEdges[edge.index()] = []
for vert in fn.vertices(edge):
meshEdges[edge.index()].append(vert.index())
for edge, nodes in meshEdges.items():
for edgeName, edgeList in mesh.edges.items():
if nodes in edgeList:
edgeSets.set_value(edge, int(edgeName), feMesh)
# construct points
pointSets = fn.MeshFunction('size_t', feMesh, 0)
for pointName, point in mesh.points.items():
pointSets.set_value(point, int(pointName), feMesh)
return dict(feMesh=feMesh,
faceSets=faceSets,
edgeSets=edgeSets,
pointSets=pointSets)
def calTrueSol(para):
nx, ny = para['mesh_N'][0], para['mesh_N'][1]
mesh = fe.UnitSquareMesh(nx, ny)
Vu = fe.FunctionSpace(mesh, 'P', para['P'])
Vc = fe.FunctionSpace(mesh, 'P', para['P'])
al = fe.Constant(para['alpha'])
f = fe.Expression(para['f'], degree=5)
q1 = fe.interpolate(fe.Expression(para['q1'], degree=5), Vc)
q2 = fe.interpolate(fe.Expression(para['q2'], degree=5), Vc)
q3 = fe.interpolate(fe.Expression(para['q3'], degree=5), Vc)
theta = fe.interpolate(fe.Expression(para['q4'], degree=5), Vc)
class BoundaryX0(fe.SubDomain):
def inside(self, x, on_boundary):
return on_boundary and fe.near(x[0], 0.0)
class BoundaryX1(fe.SubDomain):
def inside(self, x, on_boundary):
return on_boundary and fe.near(x[0], 1.0)
class BoundaryY0(fe.SubDomain):
def inside(self, x, on_boundary):
return on_boundary and fe.near(x[1], 0.0)
class BoundaryY1(fe.SubDomain):
def inside(self, x, on_boundary):
return on_boundary and fe.near(x[1], 1.0)
boundaries = fe.MeshFunction('size_t', mesh, mesh.topology().dim() - 1)
boundaries.set_all(0)
bc0, bc1, bc2, bc3 = BoundaryX0(), BoundaryX1(), BoundaryY0(), BoundaryY1()
bc0.mark(boundaries, 1)
bc1.mark(boundaries, 2)
bc2.mark(boundaries, 3)
bc3.mark(boundaries, 4)
domains = fe.MeshFunction("size_t", mesh, mesh.topology().dim())
domains.set_all(0)
bcD = fe.DirichletBC(Vu, theta, boundaries, 4)
dx = fe.Measure('dx', domain=mesh, subdomain_data=domains)
ds = fe.Measure('ds', domain=mesh, subdomain_data=boundaries)
u_trial, u_test = fe.TrialFunction(Vu), fe.TestFunction(Vu)
u = fe.Function(Vu)
left = fe.inner(al * fe.nabla_grad(u_trial), fe.nabla_grad(u_test)) * dx
right = f * u_test * dx + (q1 * u_test * ds(1) + q2 * u_test * ds(2) +
q3 * u_test * ds(3))
left_m, right_m = fe.assemble_system(left, right, bcD)
fe.solve(left_m, u.vector(), right_m)
return u
def refine_initial_mesh(self):
""" Locally refine near the hot boundary """
for i in range(self.initial_hot_boundary_refinement_cycles):
cell_markers = fenics.MeshFunction("bool", self.mesh,
self.mesh.topology().dim(),
False)
cell_markers.set_all(False)
for cell in fenics.cells(self.mesh):
found_left_boundary = False
for vertex in fenics.vertices(cell):
if fenics.near(vertex.x(0), 0.):
found_left_boundary = True
break
if found_left_boundary:
cell_markers[cell] = True
break # There should only be one such point in 1D.
self.mesh = fenics.refine(
self.mesh, cell_markers) # Does this break references?
def initial_mesh(self):
self.initial_hot_wall_refinement_cycles = 8
mesh = self.coarse_mesh()
for i in range(self.initial_hot_wall_refinement_cycles):
cell_markers = fenics.MeshFunction("bool", mesh,
mesh.topology().dim(), False)
cell_markers.set_all(False)
for cell in fenics.cells(mesh):
found_left_boundary = False
for vertex in fenics.vertices(cell):
if fenics.near(vertex.x(0), 0.):
found_left_boundary = True
break
if found_left_boundary:
cell_markers[cell] = True
break # There should only be one such point in 1D.
mesh = fenics.refine(mesh, cell_markers)
return mesh
def readCellExpression(self,
group_value_dict,
value_type="scalar",
overlap=lambda x: x[0],
*args,
**kwargs):
"""
Reads cell expression and returns it.
"""
value_type_dictionary = {
"scalar": ScalarCellExpressionFromXDMF,
"vector2d": Vector2DCellExpressionFromXDMF,
"vector3d": Vector3DCellExpressionFromXDMF
}
self.readMesh()
xdmffile = fenics.XDMFFile(self.xdmffilename)
cf = value_type_dictionary[value_type.lower()](group_value_dict,
overlap=overlap,
*args,
**kwargs)
cf.init()
for (key, value) in cf.group_value_dict.items():
cf.markers[key] = fenics.MeshFunction("size_t", self.mesh,
self.mesh.topology().dim())
xdmffile.read(cf.markers[key], key)
cf.dx[key] = fenics.Measure("dx",
domain=self.mesh,
subdomain_data=cf.markers[key])
xdmffile.close()
return cf
def refine_initial_mesh(self):
""" Replace 2D refinement method with 3D method. Perhaps one could make an n-dimensional method. """
for i in range(self.initial_hot_wall_refinement_cycles):
cell_markers = fenics.MeshFunction("bool", self.mesh,
self.mesh.topology().dim(),
False)
for cell in fenics.cells(self.mesh):
found_left_boundary = False
for vertex in fenics.vertices(cell):
if fenics.near(vertex.x(0), 0.):
found_left_boundary = True
break
if found_left_boundary:
cell_markers[cell] = True
self.mesh = fenics.refine(self.mesh, cell_markers)
def set_boundaries(self):
self.boundaries = fe.MeshFunction("size_t", self.mesh,
self.mesh.topology().dim() - 1)
self.boundaries.set_all(0)
self.ds = fe.Measure("ds")(subdomain_data=self.boundaries)
self.I = fe.Identity(self.mesh.topology().dim())
self.normal = fe.FacetNormal(self.mesh)
def useSternLayerCellBC(self):
"""
Interfaces at left hand side and right hand side, species-wise
number conservation within interval."""
self.boundary_conditions = []
# Introduce a Lagrange multiplier per species anderson
# rebuild discretization scheme (function spaces)
self.constraints = 0
self.K = self.M
self.discretize()
# Potential Dirichlet BC
self.u0 = self.delta_u_scaled / 2.
self.u1 = -self.delta_u_scaled / 2.
boundary_markers = fn.MeshFunction('size_t', self.mesh,
self.mesh.topology().dim() - 1)
bx = [
Boundary(x0=self.x0_scaled, tol=self.bctol),
Boundary(x0=self.x1_scaled, tol=self.bctol)
]
# Boundary.mark crashes the kernel if Boundary is internal class
for i, b in enumerate(bx):
b.mark(boundary_markers, i)
boundary_conditions = {
0: {
'Robin': (1. / self.lambda_S_scaled, self.u0)
},
1: {
'Robin': (1. / self.lambda_S_scaled, self.u1)
},
}
ds = fn.Measure('ds',
domain=self.mesh,
subdomain_data=boundary_markers)
integrals_R = []
for i in boundary_conditions:
if 'Robin' in boundary_conditions[i]:
r, s = boundary_conditions[i]['Robin']
integrals_R.append(r * (self.u - s) * self.v * ds(i))
self.constraints += sum(integrals_R)
# Number conservation constraints
N0 = self.L_scaled * self.c_scaled # total amount of species in cell
for k in range(self.M):
self.logger.info('{:>{lwidth}s} N0 = {:<8.4g}'.format(
'Ion species {:02d} number conservation constraint'.format(k),
N0[k],
lwidth=self.label_width))
self.applyNumberConservationConstraint(k, self.c_scaled[k])
def mark_boundaries(self, mesh: fenics.mesh):
self.value = fenics.MeshFunction("size_t", mesh,
mesh.topology().dim() - 1, 0)
self.value.set_all(IDLE_MARKER)
for boundary_name in self.boundary_names:
boundary = self.boundary_definition_constructor(
self.tolerance,
self.boundary_definition_settings[boundary_name])
boundary.mark(self.value, boundary_name.value)
def build_mesh(self):
self.length = 8.
self.height = 2.
self.notch_length = 0.2
self.notch_height = 0.4
domain = mshr.Polygon([fe.Point(0., 0.),
fe.Point(self.length/2. - self.notch_length/2., 0.),
fe.Point(self.length/2., self.notch_height),
fe.Point(self.length/2. + self.notch_length/2., 0.),
fe.Point(self.length, 0.),
fe.Point(self.length, self.height),
fe.Point(self.length/2. + self.notch_length/2., self.height),
fe.Point(self.length/2., self.height),
fe.Point(self.length/2. - self.notch_length/2., self.height),
fe.Point(0., self.height)])
# resolution = 100 if self.local_refinement_iteration == 0 else 200
# self.mesh = mshr.generate_mesh(domain, resolution)
self.mesh = mshr.generate_mesh(domain, 100)
for i in range(self.local_refinement_iteration):
cell_markers = fe.MeshFunction('bool', self.mesh, self.mesh.topology().dim())
cell_markers.set_all(False)
for cell in fe.cells(self.mesh):
p = cell.midpoint()
if p[0] > 14./32.*self.length and p[0] < 18./32.*self.length and p[1] < self.height - self.notch_height:
cell_markers[cell] = True
self.mesh = fe.refine(self.mesh, cell_markers)
length = self.length
height = self.height
notch_length = self.notch_length
class Upper(fe.SubDomain):
def inside(self, x, on_boundary):
# return on_boundary
return on_boundary and fe.near(x[1], height)
class LeftCorner(fe.SubDomain):
def inside(self, x, on_boundary):
return fe.near(x[0], 0.) and fe.near(x[1], 0.)
class RightCorner(fe.SubDomain):
def inside(self, x, on_boundary):
return fe.near(x[0], length) and fe.near(x[1], 0.)
class MiddlePoint(fe.SubDomain):
def inside(self, x, on_boundary):
# return fe.near(x[0], length/2.) and fe.near(x[1], height)
return x[0] > length/2. - notch_length/2. and x[0] < length/2. + notch_length/2. and fe.near(x[1], height)
self.upper = Upper()
self.left = LeftCorner()
self.right = RightCorner()
self.middle = MiddlePoint()
def adapt_coarse_solution_to_fine_solution(scalar,
coarse_solution,
fine_solution,
element,
absolute_tolerance=1.e-2,
maximum_refinement_cycles=6,
circumradius_threshold=0.01):
""" Refine the mesh of the coarse solution until the interpolation error tolerance is met. """
adapted_coarse_mesh = fenics.Mesh(coarse_solution.function_space().mesh())
adapted_coarse_function_space = fenics.FunctionSpace(
adapted_coarse_mesh, element)
adapted_coarse_solution = fenics.Function(adapted_coarse_function_space)
adapted_coarse_solution.leaf_node().vector(
)[:] = coarse_solution.leaf_node().vector()
for refinement_cycle in range(maximum_refinement_cycles):
cell_markers = fenics.MeshFunction(
"bool", adapted_coarse_mesh.leaf_node(),
adapted_coarse_mesh.topology().dim(), False)
for coarse_cell in fenics.cells(adapted_coarse_mesh.leaf_node()):
coarse_value = scalar(adapted_coarse_solution.leaf_node(),
coarse_cell.midpoint())
fine_value = scalar(fine_solution.leaf_node(),
coarse_cell.midpoint())
if (abs(coarse_value - fine_value) > absolute_tolerance):
cell_markers[coarse_cell] = True
cell_markers = unmark_cells_below_circumradius(
adapted_coarse_mesh.leaf_node(), cell_markers,
circumradius_threshold)
if any(cell_markers):
adapted_coarse_mesh = fenics.refine(adapted_coarse_mesh,
cell_markers)
adapted_coarse_function_space = fenics.FunctionSpace(
adapted_coarse_mesh, element)
adapted_coarse_solution = fenics.project(
fine_solution.leaf_node(),
adapted_coarse_function_space.leaf_node())
else:
break
return adapted_coarse_solution, adapted_coarse_function_space, adapted_coarse_mesh
def test_formulation_1_extrap_1_material():
'''
Test function formulation() with 1 extrinsic trap
and 1 material
'''
dt = 1
traps = [{
"energy": 1,
"materials": [1],
"type": "extrinsic"
}]
materials = [{
"alpha": 1,
"beta": 2,
"density": 3,
"borders": [0, 1],
"E_diff": 4,
"D_0": 5,
"id": 1
}]
mesh = fenics.UnitIntervalMesh(10)
V = fenics.VectorFunctionSpace(mesh, 'P', 1, 2)
W = fenics.FunctionSpace(mesh, 'P', 1)
u = fenics.Function(V)
u_n = fenics.Function(V)
v = fenics.TestFunction(V)
n = fenics.interpolate(fenics.Expression('1', degree=0), W)
solutions = list(fenics.split(u))
previous_solutions = list(fenics.split(u_n))
testfunctions = list(fenics.split(v))
extrinsic_traps = [n]
mf = fenics.MeshFunction('size_t', mesh, 1, 1)
dx = fenics.dx(subdomain_data=mf)
temp = fenics.Expression("300", degree=0)
flux_ = fenics.Expression("10000", degree=0)
F, expressions = FESTIM.formulation(
traps, extrinsic_traps, solutions, testfunctions,
previous_solutions, dt, dx, materials, temp, flux_)
expected_form = ((solutions[0] - previous_solutions[0]) / dt) * \
testfunctions[0]*dx
expected_form += 5 * fenics.exp(-4/8.6e-5/temp) * \
fenics.dot(
fenics.grad(solutions[0]), fenics.grad(testfunctions[0]))*dx(1)
expected_form += -flux_*testfunctions[0]*dx + \
((solutions[1] - previous_solutions[1]) / dt) * \
testfunctions[1]*dx
expected_form += - 5 * fenics.exp(-4/8.6e-5/temp)/1/1/2 * \
solutions[0] * (extrinsic_traps[0] - solutions[1]) * \
testfunctions[1]*dx(1)
expected_form += 1e13*fenics.exp(-1/8.6e-5/temp)*solutions[1] * \
testfunctions[1]*dx(1)
expected_form += ((solutions[1] - previous_solutions[1]) / dt) * \
testfunctions[0]*dx
assert expected_form.equals(F) is True
def coarsen(self):
""" Remesh and refine the new mesh until the interpolation error tolerance is met.
For simplicity, for now we'll consider only one scalar component of the solution.
"""
time = 0. + self.old_state.time
fine_solution = self.state.solution.copy(deepcopy=True)
self.setup_coarse_mesh()
for refinement_cycle in range(
self.coarsening_maximum_refinement_cycles):
self.setup_function_space()
self.setup_states()
self.old_state.time = 0. + time
self.old_state.solution = fenics.project(
fine_solution.leaf_node(), self.function_space.leaf_node())
if refinement_cycle == self.coarsening_maximum_refinement_cycles:
break
exceeds_tolerance = fenics.MeshFunction("bool",
self.mesh.leaf_node(),
self.mesh.topology().dim(),
False)
exceeds_tolerance.set_all(False)
for cell in fenics.cells(self.mesh.leaf_node()):
coarse_value = self.old_state.solution.leaf_node()(cell.midpoint())\
[self.coarsening_scalar_solution_component_index]
fine_value = fine_solution.leaf_node()(cell.midpoint())\
[self.coarsening_scalar_solution_component_index]
if (abs(coarse_value - fine_value) >
self.coarsening_absolute_tolerance):
exceeds_tolerance[cell] = True
if any(exceeds_tolerance):
self.mesh = fenics.refine(self.mesh, exceeds_tolerance)
else:
break
self.setup_problem_and_solver() # We broke important references.
def eva(self):
# construct solutions corresponding to the basis functions
class BoundaryX0(fe.SubDomain):
def inside(self, x, on_boundary):
return on_boundary and fe.near(x[0], 0.0)
class BoundaryX1(fe.SubDomain):
def inside(self, x, on_boundary):
return on_boundary and fe.near(x[0], 1.0)
class BoundaryY0(fe.SubDomain):
def inside(self, x, on_boundary):
return on_boundary and fe.near(x[1], 0.0)
class BoundaryY1(fe.SubDomain):
def inside(self, x, on_boundary):
return on_boundary and fe.near(x[1], 1.0)
boundaries = fe.MeshFunction('size_t', self.mesh,
self.mesh.topology().dim() - 1)
boundaries.set_all(0)
bc0, bc1, bc2, bc3 = BoundaryX0(), BoundaryX1(), BoundaryY0(
), BoundaryY1()
bc0.mark(boundaries, 1)
bc1.mark(boundaries, 2)
bc2.mark(boundaries, 3)
bc3.mark(boundaries, 4)
domains = fe.MeshFunction("size_t", self.mesh,
self.mesh.topology().dim())
domains.set_all(0)
dx = fe.Measure('dx', domain=self.mesh, subdomain_data=domains)
ds = fe.Measure('ds', domain=self.mesh, subdomain_data=boundaries)
u_trial, u_test = fe.TrialFunction(self.Vu), fe.TestFunction(self.Vu)
left = fe.inner(fe.nabla_grad(u_trial), fe.nabla_grad(u_test)) * dx
right = self.f * u_test * dx + (self.q1 * u_test * ds(1) +
self.q2 * u_test * ds(2) +
self.q3 * u_test * ds(3))
bcD = fe.DirichletBC(self.Vu, self.theta, boundaries, 4)
left_m, right_m = fe.assemble_system(left, right, bcD)
fe.solve(left_m, self.u.vector(), right_m)
def refine_mesh(self, tolerance: float) -> Optional[bool]:
"""Generate refined mesh.
This method locates cells of the mesh where the error of the
eigenfunction is above a certain threshold and generates a new mesh
with finer resolution on the problematic regions.
For a given eigenfunction $u$ with corresponding eigenvalue
$\lambda$, it must be true that $a(u, v) = \lambda b(u, v)$ for all
functions $v$. We make $v$ go through all the basis functions on the
mesh and locate the cells where the previous identity fails to hold.
Parameters
----------
tolerance : float
Criterion to determine whether a cell needs to be refined or not.
Returns
-------
refined_mesh : Optional[fenics.Mesh]
A new mesh derived from `mesh` with higher level of granularity
on certain regions. If no refinements are needed, None is
returned.
"""
ew, ev = self.eigenvalues[1:], self.eigenfunctions[1:]
dofs_needing_refinement = set()
# Find all the degrees of freedom needing refinement.
for k, (l, u) in enumerate(zip(ew, ev)):
v = fenics.TrialFunction(self.vector_space)
a, b = self._construct_eigenproblem(u, v)
A = fenics.assemble(a * fenics.dx)
B = fenics.assemble(b * fenics.dx)
error = np.abs((A - l * B).sum())
indices = np.flatnonzero(error > tolerance)
dofs_needing_refinement.update(indices)
if not dofs_needing_refinement:
return
# Refine the cells corresponding to the degrees of freedom needing
# refinement.
dofmap = self.vector_space.dofmap()
cell_markers = fenics.MeshFunction('bool', self.mesh,
self.mesh.topology().dim())
cell_markers.set_all(False)
for cell in fenics.cells(self.mesh):
cell_dofs = set(dofmap.cell_dofs(cell.index()))
if cell_dofs.intersection(dofs_needing_refinement):
cell_markers[cell] = True
return fenics.refine(self.mesh, cell_markers)
def preprocess(fname):
"""Loads mesh, defines system of equations and prepares system matrix."""
mesh = fe.Mesh(fname + ".xml")
if INPUTS['saving']['mesh']:
fe.File(fname + "_mesh.pvd") << mesh
boundaries = fe.MeshFunction('size_t', mesh, fname + '_facet_region.xml')
if INPUTS['saving']['boundaries']:
fe.File(fname + "_subdomains.pvd") << boundaries
subdomains = fe.MeshFunction('size_t', mesh,
fname + '_physical_region.xml')
if INPUTS['saving']['subdomains']:
fe.File(fname + "_subdomains.pvd") << subdomains
if INPUTS['plotting']['mesh']:
fe.plot(mesh, title='Mesh')
if INPUTS['plotting']['boundaries']:
fe.plot(boundaries, title='Boundaries')
if INPUTS['plotting']['subdomains']:
fe.plot(subdomains, title='Subdomains')
fun_space = fe.FunctionSpace(mesh,
INPUTS['element_type'],
INPUTS['element_degree'],
constrained_domain=PeriodicDomain())
if ARGS['--verbose']:
dofmap = fun_space.dofmap()
print('Number of DOFs:', len(dofmap.dofs()))
field = fe.TrialFunction(fun_space)
test_func = fe.TestFunction(fun_space)
cond = Conductivity(subdomains,
fe.Constant(INPUTS['conductivity']['gas']),
fe.Constant(INPUTS['conductivity']['solid']),
degree=0)
system_matrix = -cond * fe.inner(fe.grad(field),
fe.grad(test_func)) * fe.dx
bctop = fe.Constant(INPUTS['boundary_conditions']['top'])
bcbot = fe.Constant(INPUTS['boundary_conditions']['bottom'])
bcs = [
fe.DirichletBC(fun_space, bctop, boundaries, 1),
fe.DirichletBC(fun_space, bcbot, boundaries, 2)
]
field = fe.Function(fun_space)
return system_matrix, field, bcs, cond
def BCsDefinition(Dimensions, Mesh, V, u_0, u_1, LoadCase, BCsType=False):
# Define geometric spaces
class LowerSide(fe.SubDomain):
def inside(self, x, on_boundary):
tol = 1E-14
return on_boundary and fe.near(x[2], -Dimensions[2] / 2, tol)
class UpperSide(fe.SubDomain):
def inside(self, x, on_boundary):
tol = 1E-14
return on_boundary and fe.near(x[2], Dimensions[2] / 2, tol)
# Define integration over subdpmains
Domains_Facets = fe.MeshFunction('size_t', Mesh,
Mesh.geometric_dimension() - 1)
ds = fe.Measure('ds', domain=Mesh, subdomain_data=Domains_Facets)
# Mark all domain facets with 0
Domains_Facets.set_all(0)
# Mark bottom facets with 1
bottom = LowerSide()
bottom.mark(Domains_Facets, 1)
# Mark upper facets with 2
upper = UpperSide()
upper.mark(Domains_Facets, 2)
# Apply boundary conditions
if BCsType == 'Ideal':
if LoadCase == 'SimpleShear':
bcl = fe.DirichletBC(V, u_0, Domains_Facets, 1)
bcu = fe.DirichletBC(V, u_1, Domains_Facets, 2)
else:
bcl = fe.DirichletBC(V.sub(2), u_0, Domains_Facets, 1)
bcu = fe.DirichletBC(V.sub(2), u_1, Domains_Facets, 2)
else:
bcl = fe.DirichletBC(V, u_0, Domains_Facets, 1)
bcu = fe.DirichletBC(V, u_1, Domains_Facets, 2)
# Set of boundary conditions
BoundaryConditions = [bcl, bcu]
return [BoundaryConditions, ds]
def initial_mesh(self):
mesh = self.coarse_mesh()
for cycle in range(self.initial_hot_wall_refinement_cycles):
edge_markers = fenics.MeshFunction("bool", mesh, 1, False)
self.hot_wall.mark(edge_markers, True)
fenics.adapt(mesh, edge_markers)
mesh = mesh.child()
return mesh
def get_boundaries(self):
"""
Load the boundaries data of the mesh. More specifically, this method loads the facet_region.xml file generated
by the dolfin-converter.
Returns:
"""
if self.boundaries is None:
bound_name = self.filename.split('.')[0] + '_facet_region.xml'
file = self.mesh_folder_path + '/' + bound_name
self.boundaries = fn.MeshFunction('size_t', self.mesh, file)
if self.boundaries_ids is None:
self.boundaries_ids, _ = GMSHInterface.get_boundaries_ids(
self.geo_file)
def readFacetFunction(self, group_value_dict, *args, **kwargs):
"""
Reads facet function and returns it.
"""
self.readMesh()
xdmffile = fenics.XDMFFile(self.xdmffilename)
ff = FacetFunctionFromXDMF(group_value_dict, *args, **kwargs)
ff.init()
for (key, value) in ff.group_value_dict.items():
ff.markers[key] = fenics.MeshFunction("size_t", self.mesh, self.mesh.topology().dim() - 1)
xdmffile.read(ff.markers[key], key)
ff.marked[key] = value.get("marked", 1)
ff.ds[key] = fenics.Measure("ds", domain=self.mesh, subdomain_data=ff.markers[key])
ff.bcs[key] = value
xdmffile.close()
return ff
def wrapper2D(par, meshName, N_PN, boundaryFilePrefix, solutionFolder):
#-------- load mesh --------
mesh = fe.Mesh(meshName + '.xml')
boundaryMarkers = fe.MeshFunction('size_t', mesh, meshName + '_facet_region.xml')
ds = fe.Measure('ds', domain=mesh, subdomain_data=boundaryMarkers)
u = solvePN2nd(par, N_PN, mesh, boundaryFilePrefix, ds)
#fe.plot(u[0])
# first moment: u0 = int_{4pi} I * b0 dOmega, b0 = sqrt(1 / 4 / pi)
# radiative energy: phi = int_{4pi} I dOmega
radiativeEnergy = np.sqrt(4 * np.pi) * u[0].compute_vertex_values()
createFolder(solutionFolder)
sio.savemat('%sradiativeEnergy_P%d2nd_%s.mat'%(solutionFolder, N_PN, meshName.split('/')[-1]),
{'radiativeEnergy': radiativeEnergy, 'points': mesh.coordinates(),
'connectivityList': mesh.cells()})
return u
def refine_initial_mesh(self):
""" Refine near the hot wall. """
class HotWall(fenics.SubDomain):
def inside(self, x, on_boundary):
return on_boundary and fenics.near(x[0], 0.)
hot_wall = HotWall()
for i in range(self.initial_hot_wall_refinement_cycles):
edge_markers = fenics.MeshFunction("bool", self.mesh, 1, False)
hot_wall.mark(edge_markers, True)
fenics.adapt(self.mesh, edge_markers)
self.mesh = self.mesh.child()
def bottom_wall_shear_integrand(self):
nhat = fenics.FacetNormal(self.mesh)
p, u, T, C = fenics.split(self.solution)
bottom_wall_id = 2
mesh_function = fenics.MeshFunction("size_t", self.mesh,
self.mesh.topology().dim() - 1)
self.bottom_wall.mark(mesh_function, bottom_wall_id)
dot, grad = fenics.dot, fenics.grad
ds = fenics.ds(domain=self.mesh,
subdomain_data=mesh_function,
subdomain_id=bottom_wall_id)
return dot(grad(u[0]), nhat) * ds
def refine_initial_mesh(self):
""" Refine near the phase-change interface. """
y_pci = self.y_pci
class PhaseInterface(fenics.SubDomain):
def inside(self, x, on_boundary):
return fenics.near(x[1], y_pci)
phase_interface = PhaseInterface()
for i in range(self.pci_refinement_cycles):
edge_markers = fenics.MeshFunction("bool", self.mesh, 1, False)
phase_interface.mark(edge_markers, True)
fenics.adapt(self.mesh, edge_markers)
self.mesh = self.mesh.child(
) # Does this break references? Can we do this a different way?
def test_apply_boundary_conditions():
mesh = fenics.UnitIntervalMesh(10)
V = fenics.FunctionSpace(mesh, 'P', 1)
surface_markers = fenics.MeshFunction(
"size_t", mesh, mesh.topology().dim()-1, 0)
surface_markers.set_all(0)
i = 0
for f in fenics.facets(mesh):
i += 1
x0 = f.midpoint()
surface_markers[f] = 0
if fenics.near(x0.x(), 0):
surface_markers[f] = 1
if fenics.near(x0.x(), 1):
surface_markers[f] = 2
boundary_conditions = [
{
"surface": [1],
"value": 0,
"component": 0,
"type": "dc"
},
{
"surface": [2],
"value": 1,
"type": "dc"
}
]
bcs, expressions = FESTIM.apply_boundary_conditions(
boundary_conditions, V, surface_markers, 1, 300)
assert len(bcs) == 2
assert len(expressions) == 2
u = fenics.Function(V)
for bc in bcs:
bc.apply(u.vector())
assert abs(u(0)-0) < 1e-15
assert abs(u(1)-1) < 1e-15
def _build_function_space(self):
class Exterior(fa.SubDomain):
def inside(self, x, on_boundary):
return on_boundary
self.exterior = Exterior()
self.V = fa.FunctionSpace(self.mesh, 'P', 1)
self.sub_domains = fa.MeshFunction("size_t", self.mesh,
self.mesh.topology().dim() - 1)
self.sub_domains.set_all(0)
self.normal = fa.FacetNormal(self.mesh)
self.ds = fa.Measure("ds")(subdomain_data=self.sub_domains)
# self.source = fa.Expression(("cos(pi*x[0])*cos(pi*x[1])"), degree=3)
self.source = fa.Expression(("x[0]*x[0] + x[1]*x[1]"), degree=3)
self.source = fa.interpolate(self.source, self.V)
# self.source = fa.Constant(1.)
self.bcs = []
boundary_fn = fa.Constant(0.)
boundary_bc = fa.DirichletBC(self.V, boundary_fn, self.exterior)
self.bcs = self.bcs + [boundary_bc]
def defineBoundaryMarkers1D(mesh, zMin, zMax):
"""For implementation details, see
https://fenicsproject.org/olddocs/dolfin/1.3.0/python/demo/documented/subdomains-poisson/python/documentation.html
https://fenicsproject.discourse.group/t/natural-boundary-conditions-without-facetfunction/228/3
"""
boundaries = fe.MeshFunction("size_t", mesh, mesh.topology().dim() - 1)
class Left(fe.SubDomain):
def inside(self, x, on_boundary):
return fe.near(x[0], zMin)
class Right(fe.SubDomain):
def inside(self, x, on_boundary):
return fe.near(x[0], zMax)
left = Left()
right = Right()
left.mark(boundaries, 1)
right.mark(boundaries, 2)
ds = fe.Measure("ds", domain=mesh, subdomain_data=boundaries)
return ds
def load_2d_muscle_geo(filename='../geo/muscle_2d.xml', L0=1e-2):
mesh = fe.Mesh(filename)
coords = mesh.coordinates()
coords *= L0
mesh.bounding_box_tree().build(mesh)
# Define Boundaries
bottom = fe.CompiledSubDomain("near(x[1], side, 0.01) && on_boundary", side=-20.0 * L0)
top = fe.CompiledSubDomain("near(x[1], side, 0.01) && on_boundary", side=20.0 * L0)
# Initialize mesh function for boundary domains
boundaries = fe.MeshFunction('size_t', mesh, 2)
boundaries.set_all(0)
bottom.mark(boundaries, 1)
top.mark(boundaries, 2)
# Define new measures associated with the interior domains and
# exterior boundaries
dx = fe.Measure('dx', domain=mesh)
ds = fe.Measure('ds', domain=mesh, subdomain_data=boundaries)
return mesh, dx, ds, {"top": top, "bottom": bottom}
