OpenMCExecutioner

construction:Undocumented Class

The OpenMCExecutioner has not been documented. The content listed below should be used as a starting point for documenting the class, which includes the typical automatic documentation associated with a MooseObject; however, what is contained is ultimately determined by what is necessary to make the documentation clear for users.

Executioner for time varying simulations.

Overview

Example Input File Syntax

Input Parameters

add_variablesTrueSwitch to control whether to automatically add variables to FE problem if they don't exist already
Default:True
C++ Type:bool
Controllable:No
Description:Switch to control whether to automatically add variables to FE problem if they don't exist already
dagmc_logname/dev/nullFile to which to redirect DagMC output
Default:/dev/null
C++ Type:std::string
Controllable:No
Description:File to which to redirect DagMC output
dt1The timestep size between solves
Default:1
C++ Type:double
Controllable:No
Description:The timestep size between solves
end_time1e+30The end time of the simulation
Default:1e+30
C++ Type:double
Controllable:No
Description:The end time of the simulation
err_variablesOptional list of aux variable names in which to store the std deviation of scores
C++ Type:std::vector<std::string>
Controllable:No
Description:Optional list of aux variable names in which to store the std deviation of scores
error_on_dtminTrueThrow error when timestep is less than dtmin instead of just aborting solve.
Default:True
C++ Type:bool
Controllable:No
Description:Throw error when timestep is less than dtmin instead of just aborting solve.
launch_threadsFalseSwitch to control whether openmc should launch new child thread. NB Do not set true when MOOSE application is run iwth --n-threads > 0 !
Default:False
C++ Type:bool
Controllable:No
Description:Switch to control whether openmc should launch new child thread. NB Do not set true when MOOSE application is run iwth --n-threads > 0 !
n_threads1Number of threads to use if launch_threads = true
Default:1
C++ Type:unsigned int
Controllable:No
Description:Number of threads to use if launch_threads = true
neutron_source1e+20Strength of fusion neutron source in neutrons/s
Default:1e+20
C++ Type:double
Controllable:No
Description:Strength of fusion neutron source in neutrons/s
nl_forced_its0The Number of Forced Nonlinear Iterations
Default:0
C++ Type:unsigned int
Controllable:No
Description:The Number of Forced Nonlinear Iterations
no_scalingFalseOptionally turn off scaling by neutron source strength and unit conversion factors (useful for direct comparison with openmc results)
Default:False
C++ Type:bool
Controllable:No
Description:Optionally turn off scaling by neutron source strength and unit conversion factors (useful for direct comparison with openmc results)
normalize_solution_diff_norm_by_dtTrueWhether to divide the solution difference norm by dt. If taking 'small' time steps you probably want this to be true. If taking very 'large' timesteps in an attempt to *reach* a steady-state, you probably want this parameter to be false.
Default:True
C++ Type:bool
Controllable:No
Description:Whether to divide the solution difference norm by dt. If taking 'small' time steps you probably want this to be true. If taking very 'large' timesteps in an attempt to *reach* a steady-state, you probably want this parameter to be false.
num_steps4294967295The number of timesteps in a transient run
Default:4294967295
C++ Type:unsigned int
Controllable:No
Description:The number of timesteps in a transient run
redirect_dagoutFalseSwitch to control whether dagmc output is written to file or not
Default:False
C++ Type:bool
Controllable:No
Description:Switch to control whether dagmc output is written to file or not
reset_dtFalseUse when restarting a calculation to force a change in dt.
Default:False
C++ Type:bool
Controllable:No
Description:Use when restarting a calculation to force a change in dt.
schemeimplicit-eulerTime integration scheme used.
Default:implicit-euler
C++ Type:MooseEnum
Options:implicit-euler, explicit-euler, crank-nicolson, bdf2, explicit-midpoint, dirk, explicit-tvd-rk-2, newmark-beta
Controllable:No
Description:Time integration scheme used.
score_namesheating-local List of the OpenMC score names we want to extract
Default:heating-local
C++ Type:std::vector<std::string>
Controllable:No
Description:List of the OpenMC score names we want to extract
skip_exception_checkFalseSpecifies whether or not to skip exception check
Default:False
C++ Type:bool
Controllable:No
Description:Specifies whether or not to skip exception check
splittingTop-level splitting defining a hierarchical decomposition into subsystems to help the solver.
C++ Type:std::vector<std::string>
Controllable:No
Description:Top-level splitting defining a hierarchical decomposition into subsystems to help the solver.
tally_idsList of OpenMC tally IDs from which to extract scores. Use -1 to auto-assign.
C++ Type:std::vector<int>
Controllable:No
Description:List of OpenMC tally IDs from which to extract scores. Use -1 to auto-assign.
variablesheating-local List of aux variable names in which to store the means of scores
Default:heating-local
C++ Type:std::vector<std::string>
Controllable:No
Description:List of aux variable names in which to store the means of scores
verboseFalseSet to true to print additional information
Default:False
C++ Type:bool
Controllable:No
Description:Set to true to print additional information

Optional Parameters

abort_on_solve_failFalseabort if solve not converged rather than cut timestep
Default:False
C++ Type:bool
Controllable:No
Description:abort if solve not converged rather than cut timestep
control_tagsAdds user-defined labels for accessing object parameters via control logic.
C++ Type:std::vector<std::string>
Controllable:No
Description:Adds user-defined labels for accessing object parameters via control logic.
dtmax1e+30The maximum timestep size in an adaptive run
Default:1e+30
C++ Type:double
Controllable:No
Description:The maximum timestep size in an adaptive run
dtmin1e-13The minimum timestep size in an adaptive run
Default:1e-13
C++ Type:double
Controllable:No
Description:The minimum timestep size in an adaptive run
enableTrueSet the enabled status of the MooseObject.
Default:True
C++ Type:bool
Controllable:No
Description:Set the enabled status of the MooseObject.
n_startup_steps0The number of timesteps during startup
Default:0
C++ Type:int
Controllable:No
Description:The number of timesteps during startup
outputsVector of output names were you would like to restrict the output of variables(s) associated with this object
C++ Type:std::vector<OutputName>
Controllable:No
Description:Vector of output names were you would like to restrict the output of variables(s) associated with this object
start_time0The start time of the simulation
Default:0
C++ Type:double
Controllable:No
Description:The start time of the simulation
timestep_tolerance1e-13the tolerance setting for final timestep size and sync times
Default:1e-13
C++ Type:double
Controllable:No
Description:the tolerance setting for final timestep size and sync times
use_multiapp_dtFalseIf true then the dt for the simulation will be chosen by the MultiApps. If false (the default) then the minimum over the master dt and the MultiApps is used
Default:False
C++ Type:bool
Controllable:No
Description:If true then the dt for the simulation will be chosen by the MultiApps. If false (the default) then the minimum over the master dt and the MultiApps is used

Advanced Parameters

accept_on_max_fixed_point_iterationFalseTrue to treat reaching the maximum number of fixed point iterations as converged.
Default:False
C++ Type:bool
Controllable:No
Description:True to treat reaching the maximum number of fixed point iterations as converged.
auto_advanceFalseWhether to automatically advance sub-applications regardless of whether their solve converges, for transient executioners only.
Default:False
C++ Type:bool
Controllable:No
Description:Whether to automatically advance sub-applications regardless of whether their solve converges, for transient executioners only.
custom_abs_tol1e-50The absolute nonlinear residual to shoot for during fixed point iterations. This check is performed based on postprocessor defined by the custom_pp residual.
Default:1e-50
C++ Type:double
Controllable:No
Description:The absolute nonlinear residual to shoot for during fixed point iterations. This check is performed based on postprocessor defined by the custom_pp residual.
custom_ppPostprocessor for custom fixed point convergence check.
C++ Type:PostprocessorName
Controllable:No
Description:Postprocessor for custom fixed point convergence check.
custom_rel_tol1e-08The relative nonlinear residual drop to shoot for during fixed point iterations. This check is performed based on the postprocessor defined by custom_pp residual.
Default:1e-08
C++ Type:double
Controllable:No
Description:The relative nonlinear residual drop to shoot for during fixed point iterations. This check is performed based on the postprocessor defined by custom_pp residual.
direct_pp_valueFalseTrue to use direct postprocessor value (scaled by value on first iteration). False (default) to use difference in postprocessor value between fixed point iterations.
Default:False
C++ Type:bool
Controllable:No
Description:True to use direct postprocessor value (scaled by value on first iteration). False (default) to use difference in postprocessor value between fixed point iterations.
disable_fixed_point_residual_norm_checkFalseDisable the residual norm evaluation thus the three parameters fixed_point_rel_tol, fixed_point_abs_tol and fixed_point_force_norms.
Default:False
C++ Type:bool
Controllable:No
Description:Disable the residual norm evaluation thus the three parameters fixed_point_rel_tol, fixed_point_abs_tol and fixed_point_force_norms.
fixed_point_abs_tol1e-50The absolute nonlinear residual to shoot for during fixed point iterations. This check is performed based on the main app's nonlinear residual.
Default:1e-50
C++ Type:double
Controllable:No
Description:The absolute nonlinear residual to shoot for during fixed point iterations. This check is performed based on the main app's nonlinear residual.
fixed_point_algorithmpicardThe fixed point algorithm to converge the sequence of problems.
Default:picard
C++ Type:MooseEnum
Options:picard, secant, steffensen
Controllable:No
Description:The fixed point algorithm to converge the sequence of problems.
fixed_point_force_normsFalseForce the evaluation of both the TIMESTEP_BEGIN and TIMESTEP_END norms regardless of the existence of active MultiApps with those execute_on flags, default: false.
Default:False
C++ Type:bool
Controllable:No
Description:Force the evaluation of both the TIMESTEP_BEGIN and TIMESTEP_END norms regardless of the existence of active MultiApps with those execute_on flags, default: false.
fixed_point_max_its1Specifies the maximum number of fixed point iterations.
Default:1
C++ Type:unsigned int
Controllable:No
Description:Specifies the maximum number of fixed point iterations.
fixed_point_min_its1Specifies the minimum number of fixed point iterations.
Default:1
C++ Type:unsigned int
Controllable:No
Description:Specifies the minimum number of fixed point iterations.
fixed_point_rel_tol1e-08The relative nonlinear residual drop to shoot for during fixed point iterations. This check is performed based on the main app's nonlinear residual.
Default:1e-08
C++ Type:double
Controllable:No
Description:The relative nonlinear residual drop to shoot for during fixed point iterations. This check is performed based on the main app's nonlinear residual.
relaxation_factor1Fraction of newly computed value to keep.Set between 0 and 2.
Default:1
C++ Type:double
Controllable:No
Description:Fraction of newly computed value to keep.Set between 0 and 2.
transformed_postprocessorsList of main app postprocessors to transform during fixed point iterations
C++ Type:std::vector<PostprocessorName>
Controllable:No
Description:List of main app postprocessors to transform during fixed point iterations
transformed_variablesList of main app variables to transform during fixed point iterations
C++ Type:std::vector<std::string>
Controllable:No
Description:List of main app variables to transform during fixed point iterations

Fixed Point Iterations Parameters

automatic_scalingFalseWhether to use automatic scaling for the variables.
Default:False
C++ Type:bool
Controllable:No
Description:Whether to use automatic scaling for the variables.
compute_scaling_onceTrueWhether the scaling factors should only be computed once at the beginning of the simulation through an extra Jacobian evaluation. If this is set to false, then the scaling factors will be computed during an extra Jacobian evaluation at the beginning of every time step.
Default:True
C++ Type:bool
Controllable:No
Description:Whether the scaling factors should only be computed once at the beginning of the simulation through an extra Jacobian evaluation. If this is set to false, then the scaling factors will be computed during an extra Jacobian evaluation at the beginning of every time step.
ignore_variables_for_autoscalingList of variables that do not participate in autoscaling.
C++ Type:std::vector<std::string>
Controllable:No
Description:List of variables that do not participate in autoscaling.
off_diagonals_in_auto_scalingFalseWhether to consider off-diagonals when determining automatic scaling factors.
Default:False
C++ Type:bool
Controllable:No
Description:Whether to consider off-diagonals when determining automatic scaling factors.
resid_vs_jac_scaling_param0A parameter that indicates the weighting of the residual vs the Jacobian in determining variable scaling parameters. A value of 1 indicates pure residual-based scaling. A value of 0 indicates pure Jacobian-based scaling
Default:0
C++ Type:double
Controllable:No
Description:A parameter that indicates the weighting of the residual vs the Jacobian in determining variable scaling parameters. A value of 1 indicates pure residual-based scaling. A value of 0 indicates pure Jacobian-based scaling
scaling_group_variablesName of variables that are grouped together for determining scale factors. (Multiple groups can be provided, separated by semicolon)
C++ Type:std::vector<std::vector<std::string>>
Controllable:No
Description:Name of variables that are grouped together for determining scale factors. (Multiple groups can be provided, separated by semicolon)

Solver Variable Scaling Parameters

check_auxFalseWhether to check the auxiliary system for convergence to steady-state. If false, then the nonlinear system is used.
Default:False
C++ Type:bool
Controllable:No
Description:Whether to check the auxiliary system for convergence to steady-state. If false, then the nonlinear system is used.
steady_state_detectionFalseWhether or not to check for steady state conditions
Default:False
C++ Type:bool
Controllable:No
Description:Whether or not to check for steady state conditions
steady_state_start_time0Minimum amount of time to run before checking for steady state conditions.
Default:0
C++ Type:double
Controllable:No
Description:Minimum amount of time to run before checking for steady state conditions.
steady_state_tolerance1e-08Whenever the relative residual changes by less than this the solution will be considered to be at steady state.
Default:1e-08
C++ Type:double
Controllable:No
Description:Whenever the relative residual changes by less than this the solution will be considered to be at steady state.

Steady State Detection Parameters

compute_initial_residual_before_preset_bcsFalseUse the residual norm computed *before* preset BCs are imposed in relative convergence check
Default:False
C++ Type:bool
Controllable:No
Description:Use the residual norm computed *before* preset BCs are imposed in relative convergence check
l_abs_tol1e-50Linear Absolute Tolerance
Default:1e-50
C++ Type:double
Controllable:No
Description:Linear Absolute Tolerance
l_max_its10000Max Linear Iterations
Default:10000
C++ Type:unsigned int
Controllable:No
Description:Max Linear Iterations
l_tol1e-05Linear Tolerance
Default:1e-05
C++ Type:double
Controllable:No
Description:Linear Tolerance
n_max_nonlinear_pingpong100The maximum number of times the non linear residual can ping pong before requesting halting the current evaluation and requesting timestep cut
Default:100
C++ Type:unsigned int
Controllable:No
Description:The maximum number of times the non linear residual can ping pong before requesting halting the current evaluation and requesting timestep cut
nl_abs_div_tol1e+50Nonlinear Absolute Divergence Tolerance. A negative value disables this check.
Default:1e+50
C++ Type:double
Controllable:No
Description:Nonlinear Absolute Divergence Tolerance. A negative value disables this check.
nl_abs_step_tol0Nonlinear Absolute step Tolerance
Default:0
C++ Type:double
Controllable:No
Description:Nonlinear Absolute step Tolerance
nl_abs_tol1e-50Nonlinear Absolute Tolerance
Default:1e-50
C++ Type:double
Controllable:No
Description:Nonlinear Absolute Tolerance
nl_div_tol1e+10Nonlinear Relative Divergence Tolerance. A negative value disables this check.
Default:1e+10
C++ Type:double
Controllable:No
Description:Nonlinear Relative Divergence Tolerance. A negative value disables this check.
nl_max_funcs10000Max Nonlinear solver function evaluations
Default:10000
C++ Type:unsigned int
Controllable:No
Description:Max Nonlinear solver function evaluations
nl_max_its50Max Nonlinear Iterations
Default:50
C++ Type:unsigned int
Controllable:No
Description:Max Nonlinear Iterations
nl_rel_step_tol0Nonlinear Relative step Tolerance
Default:0
C++ Type:double
Controllable:No
Description:Nonlinear Relative step Tolerance
nl_rel_tol1e-08Nonlinear Relative Tolerance
Default:1e-08
C++ Type:double
Controllable:No
Description:Nonlinear Relative Tolerance
num_grids1The number of grids to use for a grid sequencing algorithm. This includes the final grid, so num_grids = 1 indicates just one solve in a time-step
Default:1
C++ Type:unsigned int
Controllable:No
Description:The number of grids to use for a grid sequencing algorithm. This includes the final grid, so num_grids = 1 indicates just one solve in a time-step
residual_and_jacobian_togetherFalseWhether to compute the residual and Jacobian together.
Default:False
C++ Type:bool
Controllable:No
Description:Whether to compute the residual and Jacobian together.
snesmf_reuse_baseTrueSpecifies whether or not to reuse the base vector for matrix-free calculation
Default:True
C++ Type:bool
Controllable:No
Description:Specifies whether or not to reuse the base vector for matrix-free calculation
solve_typePJFNK: Preconditioned Jacobian-Free Newton Krylov JFNK: Jacobian-Free Newton Krylov NEWTON: Full Newton Solve FD: Use finite differences to compute Jacobian LINEAR: Solving a linear problem
C++ Type:MooseEnum
Options:PJFNK, JFNK, NEWTON, FD, LINEAR
Controllable:No
Description:PJFNK: Preconditioned Jacobian-Free Newton Krylov JFNK: Jacobian-Free Newton Krylov NEWTON: Full Newton Solve FD: Use finite differences to compute Jacobian LINEAR: Solving a linear problem

Solver Parameters

contact_line_search_allowed_lambda_cuts2The number of times lambda is allowed to be cut in half in the contact line search. We recommend this number be roughly bounded by 0 <= allowed_lambda_cuts <= 3
Default:2
C++ Type:unsigned int
Controllable:No
Description:The number of times lambda is allowed to be cut in half in the contact line search. We recommend this number be roughly bounded by 0 <= allowed_lambda_cuts <= 3
contact_line_search_ltolThe linear relative tolerance to be used while the contact state is changing between non-linear iterations. We recommend that this tolerance be looser than the standard linear tolerance
C++ Type:double
Controllable:No
Description:The linear relative tolerance to be used while the contact state is changing between non-linear iterations. We recommend that this tolerance be looser than the standard linear tolerance
line_searchdefaultSpecifies the line search type (Note: none = basic)
Default:default
C++ Type:MooseEnum
Options:basic, bt, contact, cp, default, l2, none, project, shell
Controllable:No
Description:Specifies the line search type (Note: none = basic)
line_search_packagepetscThe solver package to use to conduct the line-search
Default:petsc
C++ Type:MooseEnum
Options:petsc, moose
Controllable:No
Description:The solver package to use to conduct the line-search

Solver Line Search Parameters

max_xfem_update4294967295Maximum number of times to update XFEM crack topology in a step due to evolving cracks
Default:4294967295
C++ Type:unsigned int
Controllable:No
Description:Maximum number of times to update XFEM crack topology in a step due to evolving cracks
update_xfem_at_timestep_beginFalseShould XFEM update the mesh at the beginning of the timestep
Default:False
C++ Type:bool
Controllable:No
Description:Should XFEM update the mesh at the beginning of the timestep

Xfem Fixed Point Iterations Parameters

mffd_typewpSpecifies the finite differencing type for Jacobian-free solve types. Note that the default is wp (for Walker and Pernice).
Default:wp
C++ Type:MooseEnum
Options:wp, ds
Controllable:No
Description:Specifies the finite differencing type for Jacobian-free solve types. Note that the default is wp (for Walker and Pernice).
petsc_optionsSingleton PETSc options
C++ Type:MultiMooseEnum
Options:-dm_moose_print_embedding, -dm_view, -ksp_converged_reason, -ksp_gmres_modifiedgramschmidt, -ksp_monitor, -ksp_monitor_snes_lg-snes_ksp_ew, -ksp_snes_ew, -snes_converged_reason, -snes_ksp, -snes_ksp_ew, -snes_linesearch_monitor, -snes_mf, -snes_mf_operator, -snes_monitor, -snes_test_display, -snes_view
Controllable:No
Description:Singleton PETSc options
petsc_options_inameNames of PETSc name/value pairs
C++ Type:MultiMooseEnum
Options:-ksp_atol, -ksp_gmres_restart, -ksp_max_it, -ksp_pc_side, -ksp_rtol, -ksp_type, -mat_fd_coloring_err, -mat_fd_type, -mat_mffd_type, -pc_asm_overlap, -pc_factor_levels, -pc_factor_mat_ordering_type, -pc_hypre_boomeramg_grid_sweeps_all, -pc_hypre_boomeramg_max_iter, -pc_hypre_boomeramg_strong_threshold, -pc_hypre_type, -pc_type, -snes_atol, -snes_linesearch_type, -snes_ls, -snes_max_it, -snes_rtol, -snes_divergence_tolerance, -snes_type, -sub_ksp_type, -sub_pc_type
Controllable:No
Description:Names of PETSc name/value pairs
petsc_options_valueValues of PETSc name/value pairs (must correspond with "petsc_options_iname"
C++ Type:std::vector<std::string>
Controllable:No
Description:Values of PETSc name/value pairs (must correspond with "petsc_options_iname"

Petsc Parameters

Restart Parameters

time_period_endsThe end times of time periods
C++ Type:std::vector<double>
Controllable:No
Description:The end times of time periods
time_period_startsThe start times of time periods
C++ Type:std::vector<double>
Controllable:No
Description:The start times of time periods
time_periodsThe names of periods
C++ Type:std::vector<std::string>
Controllable:No
Description:The names of periods

Time Periods Parameters

Input Files

(test/tests/thermal-mech/openmc_mech.i)
(unit/aurora_app_inputs/openmc-refine.i)
(openmc/unit/openmc_app_inputs/executioner.i)
(openmc/unit/openmc_app_inputs/executioner-many-scores.i)
(test/tests/thermal/openmc.i)
(openmc/unit/openmc_app_inputs/executioner-second.i)
(openmc/test/tests/standalone-run/openmc_example.i)
(unit/aurora_app_inputs/openmc.i)
(unit/aurora_app_inputs/openmc-thermal-expansion.i)
(openmc/perf_test.i)

(test/tests/thermal-mech/openmc_mech.i)

[Mesh]
  type = GeneratedMesh
  dim = 1
  nx = 1
[]

[Problem]
  type = OpenMCProblem
[]

[Executioner]
  type = OpenMCExecutioner
  variables = 'heating-local flux'
  err_variables = 'heating-local-err flux-err'
  score_names = 'heating-local flux'
  tally_ids = '1 1'
  neutron_source = 1.0e18
  launch_threads=false
[]

[UserObjects]
  [moab]
    type = MoabUserObject
    bin_varname = "temp"
    density_name = "density_local"
    material_names = 'copper_density air_density'
    material_openmc_names = 'copper air'
    output_skins = false
    length_scale = 1.0
  []
[]

#  Uncomment these lines to disable output to screen
#[Outputs]
#  console = false
#  [my_console]
#    type = Console
#    output_screen = false
#  []
#[]

(unit/aurora_app_inputs/openmc-refine.i)

[Mesh]
  type = GeneratedMesh
  dim = 1
  nx = 1
[]

[Problem]
  type = OpenMCProblem
[]

[Executioner]
  type = OpenMCExecutioner
  variables = 'heating-local'
  err_variables = ''
  score_names = 'heating-local'
  tally_ids = '1'
  neutron_source = 1.0e18
  launch_threads=false
  n_threads=1
  no_scaling = true
[]

[UserObjects]
  [moab]
    type = MoabUserObject
    bin_varname = "temp"
    material_names = 'copper'
    material_openmc_names = 'copper'
    length_scale = 1.0
    graveyard_scale_inner = 1.05
    n_bins = 1
    var_max = 500.
  []
[]

[Outputs]
  console = false
[]

(openmc/unit/openmc_app_inputs/executioner.i)

[Mesh]
  [meshcm]
    type = FileMeshGenerator
    file = copper_air_bcs_tetmesh.e
  []
[]

[Problem]
  type = OpenMCProblem
[]

[Executioner]
  type = OpenMCExecutioner
[]

[Variables]
  [heating-local]
      order = CONSTANT
      family = MONOMIAL
  []
[]

[UserObjects]
  [moab]
    type = MoabUserObject
  []
[]

# Worryingly this is needed when multiple app tests are run in sequence
# presumably the console object does not get properly destroyed...
[Outputs]
  console=false
[]

(openmc/unit/openmc_app_inputs/executioner-many-scores.i)

[Mesh]
  [meshcm]
    type = FileMeshGenerator
    file = copper_air_bcs_tetmesh.e
  []
[]

[Problem]
  type = OpenMCProblem
[]

[Executioner]
  type = OpenMCExecutioner
  variables = 'heating-local flux'
  score_names = 'heating-local flux'
  tally_ids = '1 1'
  err_variables = 'heating-local-err flux-err'
[]

[Variables]
  [heating-local]
      order = CONSTANT
      family = MONOMIAL
  []
  [heating-local-err]
      order = CONSTANT
      family = MONOMIAL
  []
  [flux]
      order = CONSTANT
      family = MONOMIAL
  []
  [flux-err]
      order = CONSTANT
      family = MONOMIAL
  []
[]

[UserObjects]
  [moab]
    type = MoabUserObject
  []
[]

# Worryingly this is needed when multiple app tests are run in sequence
# presumably the console object does not get properly destroyed...
[Outputs]
  console=false
[]

(test/tests/thermal/openmc.i)

[Mesh]
  type = GeneratedMesh
  dim = 1
  nx = 1
[]

[Problem]
  type = OpenMCProblem
[]

[Executioner]
  type = OpenMCExecutioner
  variables = 'heating-local flux'
  score_names = 'heating-local flux'
  tally_ids = '1 1'
  err_variables = 'heating-local-err flux-err'
  neutron_source = 1.0e18
  launch_threads=false
[]

[UserObjects]
  [moab]
    type = MoabUserObject
    bin_varname = "temperature"
    material_names = 'copper_props air_props'
    material_openmc_names = 'copper air'
    output_skins = false
    length_scale = 1.0
  []
[]

(openmc/unit/openmc_app_inputs/executioner-second.i)

[Mesh]
  type = FileMesh
  file = copper_air_bcs_tetmesh.e
  second_order = true
[]

[Problem]
  type = OpenMCProblem
[]

[Executioner]
  type = OpenMCExecutioner
  variables = 'heating-local'
  score_names = 'heating-local'
  tally_ids = '1'
  err_variables = 'heating-local-err'
[]

[Variables]
  [heating-local]
    order = CONSTANT
    family = MONOMIAL
  []
  [heating-local-err]
    order = CONSTANT
    family = MONOMIAL
  []
[]

[UserObjects]
  [moab]
    type = MoabUserObject
  []
[]

# Worryingly this is needed when multiple app tests are run in sequence
# presumably the console object does not get properly destroyed...
[Outputs]
  console=false
[]

(openmc/test/tests/standalone-run/openmc_example.i)

[Mesh]
  type = FileMesh
  file = copper_air_tetmesh.e
[]

[Problem]
  type = OpenMCProblem
[]

[Executioner]
  type = OpenMCExecutioner
  variables = 'heating-local flux'
  score_names = 'heating-local flux'
  tally_ids = '1 1'
  err_variables = 'heating-local-err flux-err'
  launch_threads=false
[]

[AuxVariables]
  [heating-local]
      order = CONSTANT
      family = MONOMIAL
  []
  [heating-local-err]
      order = CONSTANT
      family = MONOMIAL
  []
  [flux]
      order = CONSTANT
      family = MONOMIAL
  []
  [flux-err]
      order = CONSTANT
      family = MONOMIAL
  []
[]

[UserObjects]
  [moab]
    type = MoabUserObject
    length_scale = 1.0
  []
[]

[Outputs]
  exodus = true
  execute_on = "final"
[]

(unit/aurora_app_inputs/openmc.i)

[Mesh]
  type = GeneratedMesh
  dim = 1
  nx = 1
[]
  
[Problem]
  type = OpenMCProblem
[]

[Executioner]
  type = OpenMCExecutioner
[]

[UserObjects]
  [moab]
    type = MoabUserObject
    bin_varname = "temperature"
    material_names = 'copper air'
    faceting_tol = 10
  []
[]

[Outputs]
  console=false
[]

(unit/aurora_app_inputs/openmc-thermal-expansion.i)

[Mesh]
  type = GeneratedMesh
  dim = 1
  nx = 1
[]

[Problem]
  type = OpenMCProblem
[]

[Executioner]
  type = OpenMCExecutioner
  variables = 'heating-local'
  err_variables = ''
  score_names = 'heating-local'
  tally_ids = '1'
  neutron_source = 1.0e18
  launch_threads=false
  n_threads=1
  no_scaling = true
[]

[UserObjects]
  [moab]
    type = MoabUserObject
    bin_varname = "temp"
    material_names = 'copper'
    material_openmc_names = 'copper'
    #output_skins = true
    length_scale = 1.0
    graveyard_scale_inner = 1.05
    n_bins = 1
    var_max = 1200.
  []
[]

[Outputs]
  console=false
[]

(openmc/perf_test.i)

[Mesh]
  [meshcm]
    type = FileMeshGenerator
    file = copper_air_tetmesh.e
  []
[]

[Problem]
  type = OpenMCProblem
[]

[Executioner]
  type = OpenMCExecutioner
  variable = 'heating-local'
[]

[Variables]
  [heating-local]
      order = CONSTANT
      family = MONOMIAL
  []
[]

[UserObjects]
  [moab]
    type = MoabUserObject
    length_scale = 1.0
  []
[]

[VectorPostprocessors]
  [./element_value_sampler]
    type = ElementValueSampler
    variable = 'heating-local'
    sort_by = id
    execute_on = 'final'
  [../]
[]

[Postprocessors]
  [./main_total_time]
    type = PerfGraphData
    section_name = "Root"
    data_type = total
    execute_on = 'final'
  [../]
  [./execute_total_time]
    type = PerfGraphData
    section_name = "MooseApp::execute"
    data_type = total
    execute_on = 'final'
  [../]
  [./executioner_total_time]
    type = PerfGraphData
    section_name = "OpenMCExecutioner::execute"
    data_type = total
    execute_on = 'final'
  [../]
  [./executioner_init_time]
    type = PerfGraphData
    section_name = "OpenMCExecutioner::init"
    data_type = total
    execute_on = 'final'
  [../]
  [./executioner_initopenmc_time]
    type = PerfGraphData
    section_name = "OpenMCExecutioner::initopenmc"
    data_type = total
    execute_on = 'final'
  [../]
  [./executioner_run_time]
    type = PerfGraphData
    section_name = "OpenMCExecutioner::run"
    data_type = total
    execute_on = 'final'
  [../]
[]

[Outputs]
  [csv]
    type = CSV
    execute_on = 'final'
    file_base = "perf_test"
  []
  [pgraph]
    type = PerfGraphOutput
    execute_on = 'final'  # Default is "final"
    level = 2 # Default is 1
  []
[]

Overview
Example Input File Syntax
Input Parameters
Input Files