def assemble_ehpq(self, e=None, h=None, p=None, q=None, discr=None):
if discr is None:
def zero():
return 0
else:
def zero():
return discr.volume_zeros()
from hedge.tools import count_subset
e_components = count_subset(self.get_eh_subset()[0:3])
h_components = count_subset(self.get_eh_subset()[3:6])
def default_fld(fld, comp):
if fld is None:
return [zero() for i in xrange(comp)]
else:
return fld
e = default_fld(e, e_components)
h = default_fld(h, h_components)
p = default_fld(p, self.dimensions)
q = default_fld(q, self.dimensions)
from hedge.tools import join_fields
return join_fields(e, h, p, q)
def assemble_ehpq(self, e=None, h=None, p=None, q=None, discr=None):
if discr is None:
def zero():
return 0
else:
def zero():
return discr.volume_zeros()
from hedge.tools import count_subset
e_components = count_subset(self.get_eh_subset()[0:3])
h_components = count_subset(self.get_eh_subset()[3:6])
def default_fld(fld, comp):
if fld is None:
return [zero() for i in xrange(comp)]
else:
return fld
e = default_fld(e, e_components)
h = default_fld(h, h_components)
p = default_fld(p, self.dimensions)
q = default_fld(q, self.dimensions)
from hedge.tools import join_fields
return join_fields(e, h, p, q)
def assemble_eh(self, e=None, h=None, discr=None):
"Combines separate E and H vectors into a single array."
if discr is None:
def zero():
return 0
else:
def zero():
return discr.volume_zeros()
from hedge.tools import count_subset
e_components = count_subset(self.get_eh_subset()[0:3])
h_components = count_subset(self.get_eh_subset()[3:6])
def default_fld(fld, comp):
if fld is None:
return [zero() for i in xrange(comp)]
else:
return fld
e = default_fld(e, e_components)
h = default_fld(h, h_components)
from hedge.tools import join_fields
return join_fields(e, h)
def op_template(self, w=None):
"""The full operator template - the high level description of
the Maxwell operator.
Combines the relevant operator templates for spatial
derivatives, flux, boundary conditions etc.
"""
from hedge.tools import join_fields
w = self.field_placeholder(w)
if self.fixed_material:
flux_w = w
else:
epsilon = self.epsilon
mu = self.mu
flux_w = join_fields(epsilon, mu, w)
from hedge.optemplate import BoundaryPair, \
InverseMassOperator, get_flux_operator
flux_op = get_flux_operator(self.flux(self.flux_type))
bdry_flux_op = get_flux_operator(self.flux(self.bdry_flux_type))
from hedge.tools.indexing import count_subset
elec_components = count_subset(self.get_eh_subset()[0:3])
mag_components = count_subset(self.get_eh_subset()[3:6])
if self.fixed_material:
# need to check this
material_divisor = ([self.epsilon] * elec_components +
[self.mu] * mag_components)
else:
material_divisor = join_fields([epsilon] * elec_components,
[mu] * mag_components)
tags_and_bcs = [
(self.pec_tag, self.pec_bc(w)),
(self.pmc_tag, self.pmc_bc(w)),
(self.absorb_tag, self.absorbing_bc(w)),
(self.incident_tag, self.incident_bc(w)),
]
def make_flux_bc_vector(tag, bc):
if self.fixed_material:
return bc
else:
from hedge.optemplate import BoundarizeOperator
return join_fields(cse(BoundarizeOperator(tag)(epsilon)),
cse(BoundarizeOperator(tag)(mu)), bc)
return (
-self.local_derivatives(w) +
InverseMassOperator()(flux_op(flux_w) + sum(
bdry_flux_op(
BoundaryPair(flux_w, make_flux_bc_vector(tag, bc), tag))
for tag, bc in tags_and_bcs))) / material_divisor
def split_ehphi(self, w):
e, h = self.split_eh(w)
from hedge.tools import count_subset
eh_components = count_subset(self.maxwell_op.get_eh_subset())
phi = w[eh_components]
return e, h, phi
def split_ehphi(self, w):
e, h = self.split_eh(w)
from hedge.tools import count_subset
eh_components = count_subset(self.maxwell_op.get_eh_subset())
phi = w[eh_components]
return e, h, phi
def local_derivatives(self, w=None):
"""Template for the spatial derivatives of the relevant components of E and H"""
e, h = self.split_eh(self.field_placeholder(w))
def e_curl(field):
return self.space_cross_e(nabla, field)
def h_curl(field):
return self.space_cross_h(nabla, field)
from hedge.optemplate import make_nabla
from hedge.tools import join_fields, count_subset
nabla = make_nabla(self.dimensions)
if self.current is not None:
from hedge.optemplate import make_vector_field
j = make_vector_field("j",
count_subset(self.get_eh_subset()[:3]))
else:
j = 0
# in conservation form: u_t + A u_x = 0
return join_fields(
(j - h_curl(h)),
e_curl(e)
)
def field_placeholder(self, w=None):
"A placeholder for E and H."
from hedge.tools import count_subset
fld_cnt = count_subset(self.get_eh_subset())
if w is None:
from hedge.optemplate import make_sym_vector
w = make_sym_vector("w", fld_cnt)
return w
def field_placeholder(self, w=None):
"A placeholder for E and H."
from hedge.tools import count_subset
fld_cnt = count_subset(self.get_eh_subset())
if w is None:
from hedge.optemplate import make_sym_vector
w = make_sym_vector("w", fld_cnt)
return w
def __init__(self, maxwell_op, chi=1, phi_decay=0):
self.maxwell_op = maxwell_op
self.chi = chi
self.phi_decay = phi_decay
assert chi > 0
assert phi_decay >= 0
from hedge.tools import count_subset
self.component_count = count_subset(maxwell_op.get_eh_subset())+1
def __init__(self, maxwell_op, chi=1, phi_decay=0):
self.maxwell_op = maxwell_op
self.chi = chi
self.phi_decay = phi_decay
assert chi > 0
assert phi_decay >= 0
from hedge.tools import count_subset
self.component_count = count_subset(maxwell_op.get_eh_subset()) + 1
def __init__(self, dimensions, subset=None):
self.dimensions = dimensions
if subset is None:
self.subset = dimensions * [True,]
else:
# chop off any extra dimensions
self.subset = subset[:dimensions]
from hedge.tools import count_subset
self.arg_count = count_subset(self.subset)
def op_template(self, w=None):
from hedge.tools import count_subset
fld_cnt = count_subset(self.get_eh_subset())
if w is None:
from hedge.optemplate import make_sym_vector
w = make_sym_vector("w", fld_cnt + 2 * self.dimensions)
from hedge.tools import join_fields
return join_fields(MaxwellOperator.op_template(self, w[:fld_cnt]),
numpy.zeros((2 * self.dimensions, ),
dtype=object)) + self.pml_local_op(w)
def op_template(self, w=None):
from hedge.tools import count_subset
fld_cnt = count_subset(self.get_eh_subset())
if w is None:
from hedge.optemplate import make_vector_field
w = make_vector_field("w", fld_cnt+2*self.dimensions)
from hedge.tools import join_fields
return join_fields(
MaxwellOperator.op_template(self, w[:fld_cnt]),
numpy.zeros((2*self.dimensions,), dtype=object)
) + self.pml_local_op(w)
def __init__(self, dimensions, subset=None):
self.dimensions = dimensions
if subset is None:
self.subset = dimensions * [
True,
]
else:
# chop off any extra dimensions
self.subset = subset[:dimensions]
from hedge.tools import count_subset
self.arg_count = count_subset(self.subset)
def assemble_eh(self, e=None, h=None, discr=None):
"Combines separate E and H vectors into a single array."
if discr is None:
def zero():
return 0
else:
def zero():
return discr.volume_zeros()
from hedge.tools import count_subset
e_components = count_subset(self.get_eh_subset()[0:3])
h_components = count_subset(self.get_eh_subset()[3:6])
def default_fld(fld, comp):
if fld is None:
return [zero() for i in xrange(comp)]
else:
return fld
e = default_fld(e, e_components)
h = default_fld(h, h_components)
from hedge.tools import join_fields
return join_fields(e, h)
def incident_bc(self, w=None):
"Flux terms for incident boundary conditions"
# NOTE: Untested for inhomogeneous materials, but would usually be
# physically meaningless anyway (are there exceptions to this?)
e, h = self.split_eh(self.field_placeholder(w))
if not self.fixed_material:
from warnings import warn
if self.incident_tag != hedge.mesh.TAG_NONE:
warn("Incident boundary conditions assume homogeneous"
" background material, results may be unphysical")
from hedge.tools import count_subset
fld_cnt = count_subset(self.get_eh_subset())
from hedge.tools import is_zero
incident_bc_data = self.incident_bc_data(self, e, h)
if is_zero(incident_bc_data):
return make_obj_array([0]*fld_cnt)
else:
return cse(-incident_bc_data)
def incident_bc(self, w=None):
"Flux terms for incident boundary conditions"
# NOTE: Untested for inhomogeneous materials, but would usually be
# physically meaningless anyway (are there exceptions to this?)
e, h = self.split_eh(self.field_placeholder(w))
if not self.fixed_material:
from warnings import warn
if self.incident_tag != hedge.mesh.TAG_NONE:
warn("Incident boundary conditions assume homogeneous"
" background material, results may be unphysical")
from hedge.tools import count_subset
fld_cnt = count_subset(self.get_eh_subset())
from hedge.tools import is_zero
incident_bc_data = self.incident_bc_data(self, e, h)
if is_zero(incident_bc_data):
return make_obj_array([0] * fld_cnt)
else:
return cse(-incident_bc_data)
def incident_bc(self, w=None):
"Flux terms for incident boundary conditions"
# NOTE: Untested for inhomogeneous materials, but would usually be
# physically meaningless anyway (are there exceptions to this?)
e, h = self.split_eh(self.field_placeholder(w))
if not self.fixed_material:
from warnings import warn
if self.incident_tag != hedge.mesh.TAG_NONE:
warn("Incident boundary conditions assume homogeneous"+
" background material, results may be unphysical")
from hedge.tools import count_subset
from hedge.tools import join_fields
fld_cnt = count_subset(self.get_eh_subset())
if self.incident_bc_data is not None:
from hedge.optemplate import make_vector_field
inc_field = cse(
-make_vector_field("incident_bc", fld_cnt))
else:
inc_field = make_obj_array([0]*fld_cnt)
return inc_field
def op_template(self, w=None):
"""The full operator template - the high level description of
the Maxwell operator.
Combines the relevant operator templates for spatial
derivatives, flux, boundary conditions etc.
"""
from hedge.tools import join_fields
w = self.field_placeholder(w)
if self.fixed_material:
flux_w = w
else:
epsilon = self.epsilon
mu = self.mu
flux_w = join_fields(epsilon, mu, w)
from hedge.optemplate import BoundaryPair, \
InverseMassOperator, get_flux_operator
flux_op = get_flux_operator(self.flux(self.flux_type))
bdry_flux_op = get_flux_operator(self.flux(self.bdry_flux_type))
from hedge.tools.indexing import count_subset
elec_components = count_subset(self.get_eh_subset()[0:3])
mag_components = count_subset(self.get_eh_subset()[3:6])
if self.fixed_material:
# need to check this
material_divisor = (
[self.epsilon]*elec_components+[self.mu]*mag_components)
else:
material_divisor = join_fields(
[epsilon]*elec_components,
[mu]*mag_components)
tags_and_bcs = [
(self.pec_tag, self.pec_bc(w)),
(self.pmc_tag, self.pmc_bc(w)),
(self.absorb_tag, self.absorbing_bc(w)),
(self.incident_tag, self.incident_bc(w)),
]
def make_flux_bc_vector(tag, bc):
if self.fixed_material:
return bc
else:
from hedge.optemplate import BoundarizeOperator
return join_fields(
cse(BoundarizeOperator(tag)(epsilon)),
cse(BoundarizeOperator(tag)(mu)),
bc)
return (
- self.local_derivatives(w)
+ InverseMassOperator()(
flux_op(flux_w)
+ sum(
bdry_flux_op(BoundaryPair(
flux_w, make_flux_bc_vector(tag, bc), tag))
for tag, bc in tags_and_bcs))
) / material_divisor
def flux(self, flux_type):
"""The template for the numerical flux for variable coefficients.
:param flux_type: can be in [0,1] for anything between central and upwind,
or "lf" for Lax-Friedrichs.
As per Hesthaven and Warburton page 433.
"""
from hedge.flux import (make_normal, FluxVectorPlaceholder,
FluxConstantPlaceholder)
from hedge.tools import join_fields
normal = make_normal(self.dimensions)
if self.fixed_material:
from hedge.tools import count_subset
w = FluxVectorPlaceholder(count_subset(self.get_eh_subset()))
e, h = self.split_eh(w)
epsilon = FluxConstantPlaceholder(self.epsilon)
mu = FluxConstantPlaceholder(self.mu)
else:
from hedge.tools import count_subset
w = FluxVectorPlaceholder(count_subset(self.get_eh_subset()) + 2)
epsilon, mu, e, h = self.split_eps_mu_eh(w)
Z_int = (mu.int / epsilon.int)**0.5
Y_int = 1 / Z_int
Z_ext = (mu.ext / epsilon.ext)**0.5
Y_ext = 1 / Z_ext
if flux_type == "lf":
if self.fixed_material:
max_c = (self.epsilon * self.mu)**(-0.5)
else:
from hedge.flux import Max
c_int = (epsilon.int * mu.int)**(-0.5)
c_ext = (epsilon.ext * mu.ext)**(-0.5)
max_c = Max(c_int, c_ext) # noqa
return join_fields(
# flux e,
1 / 2 * (
-self.space_cross_h(normal, h.int - h.ext)
# multiplication by epsilon undoes material divisor below
#-max_c*(epsilon.int*e.int - epsilon.ext*e.ext)
),
# flux h
1 / 2 * (
self.space_cross_e(normal, e.int - e.ext)
# multiplication by mu undoes material divisor below
#-max_c*(mu.int*h.int - mu.ext*h.ext)
))
elif isinstance(flux_type, (int, float)):
# see doc/maxima/maxwell.mac
return join_fields(
# flux e,
(-1 / (Z_int + Z_ext) * self.space_cross_h(
normal,
Z_ext * (h.int - h.ext) -
flux_type * self.space_cross_e(normal, e.int - e.ext))),
# flux h
(1 / (Y_int + Y_ext) * self.space_cross_e(
normal,
Y_ext * (e.int - e.ext) +
flux_type * self.space_cross_h(normal, h.int - h.ext))),
)
else:
raise ValueError("maxwell: invalid flux_type (%s)" %
self.flux_type)
def flux(self, flux_type):
"""The template for the numerical flux for variable coefficients.
:param flux_type: can be in [0,1] for anything between central and upwind,
or "lf" for Lax-Friedrichs.
As per Hesthaven and Warburton page 433.
"""
from hedge.flux import (make_normal, FluxVectorPlaceholder,
FluxConstantPlaceholder)
from hedge.tools import join_fields
normal = make_normal(self.dimensions)
if self.fixed_material:
from hedge.tools import count_subset
w = FluxVectorPlaceholder(count_subset(self.get_eh_subset()))
e, h = self.split_eh(w)
epsilon = FluxConstantPlaceholder(self.epsilon)
mu = FluxConstantPlaceholder(self.mu)
else:
from hedge.tools import count_subset
w = FluxVectorPlaceholder(count_subset(self.get_eh_subset())+2)
epsilon, mu, e, h = self.split_eps_mu_eh(w)
Z_int = (mu.int/epsilon.int)**0.5
Y_int = 1/Z_int
Z_ext = (mu.ext/epsilon.ext)**0.5
Y_ext = 1/Z_ext
if flux_type == "lf":
if self.fixed_material:
max_c = (self.epsilon*self.mu)**(-0.5)
else:
from hedge.flux import Max
c_int = (epsilon.int*mu.int)**(-0.5)
c_ext = (epsilon.ext*mu.ext)**(-0.5)
max_c = Max(c_int, c_ext) # noqa
return join_fields(
# flux e,
1/2*(
-self.space_cross_h(normal, h.int-h.ext)
# multiplication by epsilon undoes material divisor below
#-max_c*(epsilon.int*e.int - epsilon.ext*e.ext)
),
# flux h
1/2*(
self.space_cross_e(normal, e.int-e.ext)
# multiplication by mu undoes material divisor below
#-max_c*(mu.int*h.int - mu.ext*h.ext)
))
elif isinstance(flux_type, (int, float)):
# see doc/maxima/maxwell.mac
return join_fields(
# flux e,
(
-1/(Z_int+Z_ext)*self.space_cross_h(normal,
Z_ext*(h.int-h.ext)
- flux_type*self.space_cross_e(normal, e.int-e.ext))
),
# flux h
(
1/(Y_int + Y_ext)*self.space_cross_e(normal,
Y_ext*(e.int-e.ext)
+ flux_type*self.space_cross_h(normal, h.int-h.ext))
),
)
else:
raise ValueError("maxwell: invalid flux_type (%s)"
% self.flux_type)
