def _create_solver(self):
"""Instantiate a IRAMSolver."""
self.solver = openmoc.CPUSolver(self.track_generator)
self.solver.setNumThreads(self.num_threads)
self.solver.setConvergenceThreshold(self.tolerance)
# Initialize IRAMSolver to perform forward eigenmode calculation
self.solver = openmoc.krylov.IRAMSolver(self.solver)
###############################################################################
######################## Creating the TrackGenerator ######################
###############################################################################
openmoc.log.py_printf('NORMAL', 'Initializing the track generator...')
track_generator = openmoc.TrackGenerator(geometry, opts.num_azim,
opts.azim_spacing)
track_generator.setNumThreads(opts.num_omp_threads)
track_generator.generateTracks()
###############################################################################
########################### Running a Simulation ##########################
###############################################################################
solver = openmoc.CPUSolver(track_generator)
solver.setNumThreads(opts.num_omp_threads)
solver.setConvergenceThreshold(opts.tolerance)
solver.computeEigenvalue(opts.max_iters)
solver.printTimerReport()
###############################################################################
############################ Generating Plots ############################
###############################################################################
openmoc.log.py_printf('NORMAL', 'Plotting data...')
openmoc.plotter.plot_materials(geometry, gridsize=100)
openmoc.plotter.plot_cells(geometry, gridsize=100)
openmoc.plotter.plot_flat_source_regions(geometry, gridsize=100)
openmoc.plotter.plot_spatial_fluxes(solver, energy_groups=[1])
def _create_solver(self):
"""Instantiate a CPUSolver."""
self.solver = openmoc.CPUSolver()
self.solver.setNumThreads(self.num_threads)
self.solver.setConvergenceThreshold(self.tolerance)
def _create_solver(self):
"""Instantiate a CPUSolver."""
self.solver = openmoc.CPUSolver(self.track_generator)
self.solver.setNumThreads(self.num_threads)
self.solver.setConvergenceThreshold(self.tolerance)
self.solver.setSolverMode(self.calculation_mode)
def compute_sph_factors(mgxs_lib,
max_sph_iters=30,
sph_tol=1E-5,
fix_src_tol=1E-5,
num_azim=4,
azim_spacing=0.1,
zcoord=0.0,
num_threads=1,
throttle_output=True,
geometry=None,
track_generator=None,
solver=None,
sph_domains=None):
"""Compute SPH factors for an OpenMC multi-group cross section library.
This routine coputes SuPerHomogenisation (SPH) factors for an OpenMC MGXS
library. The SPH scheme is outlined by Alain Hebert in the following paper:
Hebert, A., "A Consistent Technique for the Pin-by-Pin
Homogenization of a Pressurized Water Reactor Assembly."
Nuclear Science and Engineering, 113 (3), pp. 227-233, 1993.
The SPH factors are needed to preserve reaction rates in heterogeneous
geometries. The energy condensation process leads to a bias between
ultrafine and coarse energy group calculations. This bias is a result of the
use of scalar flux-weighting to compute MGXS without properly accounting for
angular-dependence of the flux.
Parameters
----------
mgxs_lib : openmc.mgxs.Library
An OpenMC multi-group cross section library
max_sph_iters : Integral
The maximum number of SPH iterations (default is 30)
sph_tol : Real
The tolerance on the SPH factor convergence (default is 1E-5)
fix_src_tol : Real
The tolerance on the MOC fixed source calculations (default is 1E-5)
num_azim : Integral
The number of azimuthal angles (default is 4)
azim_spacing : Real
The track spacing (default is 0.1 centimeters)
zcoord : Real
The coordinate on the z-axis (default is 0.)
num_threads : Real
The number of OpenMP threads (default is 1)
throttle_output : bool
Whether to suppress output from fixed source calculations (default is True)
geometry : openmoc.Geometry
An optional openmoc geometry to compute SPH factors on
track_generator : openmoc.TrackGenerator
An optional track generator to avoid initializing it in this routine
solver : openmoc.Solver
An optional openmoc solver to compute SPH factors with
sph_domains : list of int
A list of domain (cell or material, based on mgxs_lib domain type) ids,
in which SPH factors should be computed. Default is only fissonable FSRs
Returns
-------
fsrs_to_sph : numpy.ndarray of Real
A NumPy array of SPH factors indexed by FSR and energy group
sph_mgxs_lib : openmc.mgxs.Library
An OpenMC MGXS library with the SPH factors applied to each MGXS
sph_to_fsrs_indices : numpy.ndarray of Integral
A NumPy array of all FSRs to which SPH factors were applied
"""
import openmc.mgxs
cv.check_type('mgxs_lib', mgxs_lib, openmc.mgxs.Library)
# For Python 2.X.X
if sys.version_info[0] == 2:
from openmc.openmoc_compatible import get_openmoc_geometry
from process import get_scalar_fluxes
# For Python 3.X.X
else:
from openmc.openmoc_compatible import get_openmoc_geometry
from openmoc.process import get_scalar_fluxes
py_printf('NORMAL', 'Computing SPH factors...')
if not geometry:
# Create an OpenMOC Geometry from the OpenMC Geometry
geometry = get_openmoc_geometry(mgxs_lib.geometry)
# Load the MGXS library data into the OpenMOC geometry
load_openmc_mgxs_lib(mgxs_lib, geometry)
if not track_generator:
# Initialize an OpenMOC TrackGenerator
track_generator = openmoc.TrackGenerator(geometry, num_azim,
azim_spacing)
track_generator.setZCoord(zcoord)
track_generator.generateTracks()
track_generator.initializeVolumes()
else:
track_generator.initializeVolumes()
py_printf(
'WARNING', 'Using provided track generator, ignoring '
'arguments for track generation settings')
if not solver:
# Initialize an OpenMOC Solver
solver = openmoc.CPUSolver(track_generator)
solver.setConvergenceThreshold(fix_src_tol)
solver.setNumThreads(num_threads)
else:
py_printf(
'WARNING', 'Using provided solver, ignoring arguments for '
'solver settings')
# Get all OpenMOC domains
if mgxs_lib.domain_type == 'material':
openmoc_domains = geometry.getAllMaterials()
elif mgxs_lib.domain_type == 'cell':
openmoc_domains = geometry.getAllMaterialCells()
else:
py_printf(
'ERROR', 'SPH factors cannot be applied for an OpenMC MGXS '
'library of domain type %s', mgxs_lib.domain_type)
if not sph_domains:
sph_domains = []
# If unspecified, apply sph factors in fissionable regions
for openmoc_domain in openmoc_domains.values():
if openmoc_domain.isFissionable():
sph_domains.append(openmoc_domain.getId())
openmc_fluxes = _load_openmc_src(mgxs_lib, solver)
# Initialize SPH factors
num_groups = geometry.getNumEnergyGroups()
num_fsrs = geometry.getNumFSRs()
# Map FSRs to domains (and vice versa) to compute domain-averaged fluxes
fsrs_to_domains = np.zeros(num_fsrs)
domains_to_fsrs = collections.defaultdict(list)
sph_to_fsr_indices = []
for fsr in range(num_fsrs):
cell = geometry.findCellContainingFSR(fsr)
if mgxs_lib.domain_type == 'material':
domain = cell.getFillMaterial()
else:
domain = cell
fsrs_to_domains[fsr] = domain.getId()
domains_to_fsrs[domain.getId()].append(fsr)
if domain.getId() in sph_domains:
sph_to_fsr_indices.append(fsr)
# Build a list of indices into the SPH array for fissionable domains
sph_to_domain_indices = []
for i, openmc_domain in enumerate(mgxs_lib.domains):
if openmc_domain.id in openmoc_domains:
openmoc_domain = openmoc_domains[openmc_domain.id]
if openmoc_domain.getId() in sph_domains:
sph_to_domain_indices.append(i)
py_printf('NORMAL', 'Computing SPH factors for %d "%s" domains',
len(sph_to_domain_indices), mgxs_lib.domain_type)
# Initialize array of domain-averaged fluxes and SPH factors
num_domains = len(mgxs_lib.domains)
openmoc_fluxes = np.zeros((num_domains, num_groups))
sph = np.ones((num_domains, num_groups))
# Store starting verbosity log level
log_level = openmoc.get_log_level()
# SPH iteration loop
for i in range(max_sph_iters):
# Run fixed source calculation with suppressed output
if throttle_output:
openmoc.set_log_level('WARNING')
# Disable flux resets between SPH iterations for speed
if i == 1:
solver.setRestartStatus(True)
# Fixed source calculation
solver.computeFlux()
# Restore log output level
if throttle_output:
openmoc.set_log_level('NORMAL')
# Extract the FSR scalar fluxes
fsr_fluxes = get_scalar_fluxes(solver)
# Compute the domain-averaged flux in each energy group
for j, openmc_domain in enumerate(mgxs_lib.domains):
domain_fluxes = fsr_fluxes[fsrs_to_domains == openmc_domain.id, :]
openmoc_fluxes[j, :] = np.mean(domain_fluxes, axis=0)
# Compute SPH factors
old_sph = np.copy(sph)
sph = openmc_fluxes / openmoc_fluxes
sph = np.nan_to_num(sph)
sph[sph == 0.0] = 1.0
# Compute SPH factor residuals
res = np.abs((sph - old_sph) / old_sph)
res = np.nan_to_num(res)
# Extract residuals for fissionable domains only
res = res[sph_to_domain_indices, :]
# Report maximum SPH factor residual
py_printf('NORMAL', 'SPH Iteration %d:\tres = %1.3e', i, res.max())
# Create a new MGXS library with cross sections updated by SPH factors
sph_mgxs_lib = _apply_sph_factors(mgxs_lib, geometry, sph, sph_domains)
# Load the new MGXS library data into the OpenMOC geometry
load_openmc_mgxs_lib(sph_mgxs_lib, geometry)
# Check max SPH factor residual for this domain for convergence
if res.max() < sph_tol and i > 0:
break
# Warn user if SPH factors did not converge
else:
py_printf('WARNING', 'SPH factors did not converge')
# Collect SPH factors for each FSR, energy group
fsrs_to_sph = np.ones((num_fsrs, num_groups), dtype=np.float)
for i, openmc_domain in enumerate(mgxs_lib.domains):
if openmc_domain.id in openmoc_domains:
openmoc_domain = openmoc_domains[openmc_domain.id]
if openmoc_domain.getId() in sph_domains:
fsr_ids = domains_to_fsrs[openmc_domain.id]
fsrs_to_sph[fsr_ids, :] = sph[i, :]
return fsrs_to_sph, sph_mgxs_lib, np.array(sph_to_fsr_indices)
def _run_openmoc(self):
runtime = openmoc.RuntimeParameters()
string_input = [
'-debug', '1', '-log_level', 'NORMAL', '-domain_decompose',
'2,2,2', '-num_domain_modules', '1,1,1', '-num_threads', '1',
'-log_filename', 'test_problem.log', '-geo_filename',
'geometry_file.geo', '-azim_spacing', '0.22 ', '-num_azim', '4',
'-polar_spacing', '0.8', '-num_polar', '6', '-seg_zones',
'-5.0,5.0', '-segmentation_type', '3', '-quadraturetype', '2',
'-CMFD_group_structure', '1/2,3,4/5,6,7', '-CMFD_lattice', '2,3,3',
'-widths_x', '1,2*1,1', '-widths_y', '1,2*1,1', '-widths_z',
'3.5,2.5*2,1.5', '-CMFD_flux_update_on', '1', '-knearest', '2',
'-CMFD_centroid_update_on', '1', '-use_axial_interpolation', '2',
'-SOR_factor', '1.5', '-CMFD_relaxation_factor', '0.7',
'-ls_solver', '1', '-max_iters', '15', '-MOC_src_residual_type',
'1', '-MOC_src_tolerance', '1.0E-2', '-output_mesh_lattice',
'-output_mesh_lattice', ' 5,5,9', ' -output_type', ' 0',
'-output_mesh_lattice', '-output_mesh_lattice', ' 5,5,9',
' -output_type', ' 1', '-non_uniform_output',
'1.26*3/1*3/4.*3/-1.,1.,-1.', ' -output_type 1 ',
'-verbose_report', '1', '-time_report', '1'
]
string_input = [s.encode('utf8') for s in string_input]
runtime.setRuntimeParameters(string_input)
print(string_input)
# Define simulation parameters
num_threads = runtime._num_threads
# Set logging information
if (runtime._log_filename):
openmoc.set_log_filename(runtime._log_filename)
openmoc.set_log_level(runtime._log_level)
openmoc.set_line_length(120)
py_printf('NORMAL', 'Geometry file = %s', runtime._geo_filename)
py_printf('NORMAL', 'Azimuthal spacing = %f', runtime._azim_spacing)
py_printf('NORMAL', 'Azimuthal angles = %d', runtime._num_azim)
py_printf('NORMAL', 'Polar spacing = %f', runtime._polar_spacing)
py_printf('NORMAL', 'Polar angles = %d', runtime._num_polar)
# Create the geometry
py_printf('NORMAL', 'Creating geometry...')
geometry = openmoc.Geometry()
self.input_set.geometry = geometry
if (not runtime._geo_filename):
py_printf('ERROR', 'No geometry file is provided')
geometry.loadFromFile(runtime._geo_filename)
if False: #FIXME
geometry.setDomainDecomposition(runtime._NDx, runtime._NDy,
runtime._NDz, MPI_COMM_WORLD)
geometry.setNumDomainModules(runtime._NMx, runtime._NMy, runtime._NMz)
if ((runtime._NCx > 0 and runtime._NCy > 0 and runtime._NCz > 0)
or (not runtime._cell_widths_x.empty()
and not runtime._cell_widths_y.empty()
and not runtime._cell_widths_z.empty())):
# Create CMFD mesh
py_printf('NORMAL', 'Creating CMFD mesh...')
cmfd = openmoc.Cmfd()
cmfd.setSORRelaxationFactor(runtime._SOR_factor)
cmfd.setCMFDRelaxationFactor(runtime._CMFD_relaxation_factor)
if (runtime._cell_widths_x.empty()
or runtime._cell_widths_y.empty()
or runtime._cell_widths_z.empty()):
cmfd.setLatticeStructure(runtime._NCx, runtime._NCy,
runtime._NCz)
else:
cmfd_widths = [
runtime._cell_widths_x, runtime._cell_widths_y,
runtime._cell_widths_z
]
cmfd.setWidths(cmfd_widths)
if (not runtime._CMFD_group_structure.empty()):
cmfd.setGroupStructure(runtime._CMFD_group_structure)
cmfd.setKNearest(runtime._knearest)
cmfd.setCentroidUpdateOn(runtime._CMFD_centroid_update_on)
cmfd.useAxialInterpolation(runtime._use_axial_interpolation)
geometry.setCmfd(cmfd)
geometry.initializeFlatSourceRegions()
# Initialize track generator and generate tracks
py_printf('NORMAL', 'Initializing the track generator...')
if runtime._quadraturetype == 0:
quad = openmoc.TYPolarQuad()
if runtime._quadraturetype == 1:
quad = openmoc.LeonardPolarQuad()
if runtime._quadraturetype == 2:
quad = openmoc.GLPolarQuad()
if runtime._quadraturetype == 3:
quad = openmoc.EqualWeightPolarQuad()
if runtime._quadraturetype == 4:
quad = openmoc.EqualAnglePolarQuad()
quad.setNumAzimAngles(runtime._num_azim)
quad.setNumPolarAngles(runtime._num_polar)
track_generator = openmoc.TrackGenerator3D(geometry, runtime._num_azim,
runtime._num_polar,
runtime._azim_spacing,
runtime._polar_spacing)
track_generator.setNumThreads(num_threads)
track_generator.setQuadrature(quad)
track_generator.setSegmentFormation(runtime._segmentation_type)
if (len(runtime._seg_zones) > 0):
track_generator.setSegmentationZones(runtime._seg_zones)
track_generator.generateTracks()
self.track_generator = track_generator
# Initialize solver and run simulation
if (runtime._linear_solver):
self.solver = openmoc.CPULSSolver(track_generator)
else:
self.solver = openmoc.CPUSolver(track_generator)
if (runtime._verbose_report):
self.solver.setVerboseIterationReport()
self.solver.setNumThreads(num_threads)
self.solver.setConvergenceThreshold(runtime._tolerance)
self.solver.computeEigenvalue(runtime._max_iters,
runtime._MOC_src_residual_type)
if (runtime._time_report):
self.solver.printTimerReport()
# Extract reaction rates
my_rank = 0
#if False: #FIXME
#MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);
rxtype = {'FISSION_RX', 'TOTAL_RX', 'ABSORPTION_RX', 'FLUX_RX'}
