def _set_code_unit_attributes(self):
if self.cosmological_simulation:
k = cosmology_get_units(
self.hubble_constant,
self.omega_matter,
self.parameters["CosmologyComovingBoxSize"],
self.parameters["CosmologyInitialRedshift"],
self.current_redshift,
)
# Now some CGS values
box_size = self.parameters["CosmologyComovingBoxSize"]
setdefaultattr(self, "length_unit", self.quan(box_size, "Mpccm/h"))
setdefaultattr(
self,
"mass_unit",
self.quan(k["urho"], "g/cm**3") *
(self.length_unit.in_cgs())**3,
)
setdefaultattr(self, "time_unit", self.quan(k["utim"], "s"))
setdefaultattr(self, "velocity_unit", self.quan(k["uvel"], "cm/s"))
else:
if "LengthUnits" in self.parameters:
length_unit = self.parameters["LengthUnits"]
mass_unit = self.parameters["DensityUnits"] * length_unit**3
time_unit = self.parameters["TimeUnits"]
elif "SimulationControl" in self.parameters:
units = self.parameters["SimulationControl"]["Units"]
length_unit = units["Length"]
mass_unit = units["Density"] * length_unit**3
time_unit = units["Time"]
else:
mylog.warning("Setting 1.0 in code units to be 1.0 cm")
mylog.warning("Setting 1.0 in code units to be 1.0 s")
length_unit = mass_unit = time_unit = 1.0
setdefaultattr(self, "length_unit", self.quan(length_unit, "cm"))
setdefaultattr(self, "mass_unit", self.quan(mass_unit, "g"))
setdefaultattr(self, "time_unit", self.quan(time_unit, "s"))
setdefaultattr(self, "velocity_unit",
self.length_unit / self.time_unit)
density_unit = self.mass_unit / self.length_unit**3
magnetic_unit = np.sqrt(4 * np.pi * density_unit) * self.velocity_unit
magnetic_unit = np.float64(magnetic_unit.in_cgs())
setdefaultattr(self, "magnetic_unit",
self.quan(magnetic_unit, "gauss"))
def _set_code_unit_attributes(self):
if self.cosmological_simulation:
box_size = self.parameters["Physics"]["cosmology"][
"comoving_box_size"]
k = cosmology_get_units(
self.hubble_constant,
self.omega_matter,
box_size,
self.parameters["Physics"]["cosmology"]["initial_redshift"],
self.current_redshift,
)
# Now some CGS values
setdefaultattr(self, "length_unit", self.quan(box_size, "Mpccm/h"))
setdefaultattr(
self,
"mass_unit",
self.quan(k["urho"], "g/cm**3") *
(self.length_unit.in_cgs())**3,
)
setdefaultattr(self, "velocity_unit", self.quan(k["uvel"], "cm/s"))
else:
p = self.parameters
for d, u in zip(("length", "time"), ("cm", "s")):
val = nested_dict_get(p, ("Units", d), default=1)
setdefaultattr(self, f"{d}_unit", self.quan(val, u))
mass = nested_dict_get(p, ("Units", "mass"))
if mass is None:
density = nested_dict_get(p, ("Units", "density"))
if density is not None:
mass = density * self.length_unit**3
else:
mass = 1
setdefaultattr(self, "mass_unit", self.quan(mass, "g"))
setdefaultattr(self, "velocity_unit",
self.length_unit / self.time_unit)
magnetic_unit = np.sqrt(4 * np.pi * self.mass_unit /
(self.time_unit**2 * self.length_unit))
magnetic_unit = np.float64(magnetic_unit.in_cgs())
setdefaultattr(self, "magnetic_unit",
self.quan(magnetic_unit, "gauss"))
def _parse_parameter_file(self):
"""
Parses the parameter file and establishes the various
dictionaries.
"""
f = open(self.parameter_filename, "r")
# get dimension from first block name
b0, fn0 = f.readline().strip().split()
level0, left0, right0 = get_block_info(b0, min_dim=0)
root_blocks = get_root_blocks(b0)
f.close()
self.dimensionality = left0.size
self.periodicity = \
ensure_tuple(np.ones(self.dimensionality, dtype=bool))
lcfn = self.parameter_filename[:-len(self._suffix)] + ".libconfig"
if os.path.exists(lcfn):
with io.open(lcfn, "r") as lf:
self.parameters = libconf.load(lf)
cosmo = nested_dict_get(
self.parameters, ("Physics", "cosmology"))
if cosmo is not None:
self.cosmological_simulation = 1
co_pars = ["hubble_constant_now", "omega_matter_now",
"omega_lambda_now", "comoving_box_size",
"initial_redshift"]
co_dict = \
dict((attr, nested_dict_get(self.parameters,
("Physics", "cosmology", attr))) for attr in co_pars)
for attr in ["hubble_constant",
"omega_matter",
"omega_lambda"]:
setattr(self, attr, co_dict["%s_now" % attr])
# Current redshift is not stored, so it's not possible
# to set all cosmological units yet.
# Get the time units and use that to figure out redshift.
k = cosmology_get_units(
self.hubble_constant, self.omega_matter,
co_dict["comoving_box_size"],
co_dict["initial_redshift"], 0)
setdefaultattr(
self, 'time_unit', self.quan(k['utim'], 's'))
co = Cosmology(hubble_constant=self.hubble_constant,
omega_matter=self.omega_matter,
omega_lambda=self.omega_lambda)
else:
self.cosmological_simulation = 0
else:
self.cosmological_simulation = 0
fh = h5py.File(os.path.join(self.directory, fn0), "r")
self.domain_left_edge = fh.attrs["lower"]
self.domain_right_edge = fh.attrs["upper"]
# all blocks are the same size
ablock = fh[list(fh.keys())[0]]
self.current_time = ablock.attrs["time"][0]
gsi = ablock.attrs["enzo_GridStartIndex"]
gei = ablock.attrs["enzo_GridEndIndex"]
self.ghost_zones = gsi[0]
self.root_block_dimensions = root_blocks
self.active_grid_dimensions = gei - gsi + 1
self.grid_dimensions = ablock.attrs["enzo_GridDimension"]
self.domain_dimensions = root_blocks * self.active_grid_dimensions
fh.close()
if self.cosmological_simulation:
self.current_redshift = \
co.z_from_t(self.current_time * self.time_unit)
self.periodicity += (False, ) * (3 - self.dimensionality)
self.gamma = nested_dict_get(self.parameters, ("Field", "gamma"))
self.unique_identifier = \
str(int(os.stat(self.parameter_filename)[stat.ST_CTIME]))
