PrecursorSource

Overview

This object adds the $var element = document.getElementById("moose-equation-24c71713-9f1d-4ed3-9f8a-8043f29a8f47");katex.render("\\sum_{g'= 1}^G \\beta_i \\nu \\Sigma_{g'}^f \\phi_{g'}", element, {displayMode:false,throwOnError:false});$ source term of the delayed neutron precursor equation.

Example Input File Syntax

Input Parameters

group_fluxesAll the variables that hold the group fluxes. These MUST be listed by decreasing energy/increasing group number.
C++ Type:std::vector<VariableName>
Unit:(no unit assumed)
Controllable:No
Description:All the variables that hold the group fluxes. These MUST be listed by decreasing energy/increasing group number.
num_groupsThe total numer of energy groups
C++ Type:unsigned int
Unit:(no unit assumed)
Controllable:No
Description:The total numer of energy groups
variableThe name of the variable that this residual object operates on
C++ Type:NonlinearVariableName
Unit:(no unit assumed)
Controllable:No
Description:The name of the variable that this residual object operates on

Required Parameters

blockThe list of blocks (ids or names) that this object will be applied
C++ Type:std::vector<SubdomainName>
Unit:(no unit assumed)
Controllable:No
Description:The list of blocks (ids or names) that this object will be applied
displacementsThe displacements
C++ Type:std::vector<VariableName>
Unit:(no unit assumed)
Controllable:No
Description:The displacements
eigenvalue_scaling1Artificial scaling factor for the fission source. Primarily for introducing artificial reactivity to make super/subcritical systems exactly critical or to simulate reactivity insertions/withdrawals.
Default:1
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:Artificial scaling factor for the fission source. Primarily for introducing artificial reactivity to make super/subcritical systems exactly critical or to simulate reactivity insertions/withdrawals.
prec_scale1The factor by which the neutron fluxes are scaled.
Default:1
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The factor by which the neutron fluxes are scaled.
precursor_group_numberWhat precursor group this kernel is acting on.
C++ Type:unsigned int
Unit:(no unit assumed)
Controllable:No
Description:What precursor group this kernel is acting on.
prop_getter_suffixAn optional suffix parameter that can be appended to any attempt to retrieve/get material properties. The suffix will be prepended with a '_' character.
C++ Type:MaterialPropertyName
Unit:(no unit assumed)
Controllable:No
Description:An optional suffix parameter that can be appended to any attempt to retrieve/get material properties. The suffix will be prepended with a '_' character.
temperature800.0The temperature used to interpolate material properties.
Default:800.0
C++ Type:std::vector<VariableName>
Unit:(no unit assumed)
Controllable:No
Description:The temperature used to interpolate material properties.
use_exp_formFalseWhether concentrations should be in an expotential/logarithmic format.
Default:False
C++ Type:bool
Unit:(no unit assumed)
Controllable:No
Description:Whether concentrations should be in an expotential/logarithmic format.
use_interpolated_stateFalseFor the old and older state use projected material properties interpolated at the quadrature points. To set up projection use the ProjectedStatefulMaterialStorageAction.
Default:False
C++ Type:bool
Unit:(no unit assumed)
Controllable:No
Description:For the old and older state use projected material properties interpolated at the quadrature points. To set up projection use the ProjectedStatefulMaterialStorageAction.

Optional Parameters

absolute_value_vector_tagsThe tags for the vectors this residual object should fill with the absolute value of the residual contribution
C++ Type:std::vector<TagName>
Unit:(no unit assumed)
Controllable:No
Description:The tags for the vectors this residual object should fill with the absolute value of the residual contribution
extra_matrix_tagsThe extra tags for the matrices this Kernel should fill
C++ Type:std::vector<TagName>
Unit:(no unit assumed)
Controllable:No
Description:The extra tags for the matrices this Kernel should fill
extra_vector_tagsThe extra tags for the vectors this Kernel should fill
C++ Type:std::vector<TagName>
Unit:(no unit assumed)
Controllable:No
Description:The extra tags for the vectors this Kernel should fill
matrix_tagssystemThe tag for the matrices this Kernel should fill
Default:system
C++ Type:MultiMooseEnum
Unit:(no unit assumed)
Options:nontime, system
Controllable:No
Description:The tag for the matrices this Kernel should fill
vector_tagsnontimeThe tag for the vectors this Kernel should fill
Default:nontime
C++ Type:MultiMooseEnum
Unit:(no unit assumed)
Options:nontime, time
Controllable:No
Description:The tag for the vectors this Kernel should fill

Tagging Parameters

control_tagsAdds user-defined labels for accessing object parameters via control logic.
C++ Type:std::vector<std::string>
Unit:(no unit assumed)
Controllable:No
Description:Adds user-defined labels for accessing object parameters via control logic.
diag_save_inThe name of auxiliary variables to save this Kernel's diagonal Jacobian contributions to. Everything about that variable must match everything about this variable (the type, what blocks it's on, etc.)
C++ Type:std::vector<AuxVariableName>
Unit:(no unit assumed)
Controllable:No
Description:The name of auxiliary variables to save this Kernel's diagonal Jacobian contributions to. Everything about that variable must match everything about this variable (the type, what blocks it's on, etc.)
enableTrueSet the enabled status of the MooseObject.
Default:True
C++ Type:bool
Unit:(no unit assumed)
Controllable:Yes
Description:Set the enabled status of the MooseObject.
implicitTrueDetermines whether this object is calculated using an implicit or explicit form
Default:True
C++ Type:bool
Unit:(no unit assumed)
Controllable:No
Description:Determines whether this object is calculated using an implicit or explicit form
save_inThe name of auxiliary variables to save this Kernel's residual contributions to. Everything about that variable must match everything about this variable (the type, what blocks it's on, etc.)
C++ Type:std::vector<AuxVariableName>
Unit:(no unit assumed)
Controllable:No
Description:The name of auxiliary variables to save this Kernel's residual contributions to. Everything about that variable must match everything about this variable (the type, what blocks it's on, etc.)
seed0The seed for the master random number generator
Default:0
C++ Type:unsigned int
Unit:(no unit assumed)
Controllable:No
Description:The seed for the master random number generator
use_displaced_meshFalseWhether or not this object should use the displaced mesh for computation. Note that in the case this is true but no displacements are provided in the Mesh block the undisplaced mesh will still be used.
Default:False
C++ Type:bool
Unit:(no unit assumed)
Controllable:No
Description:Whether or not this object should use the displaced mesh for computation. Note that in the case this is true but no displacements are provided in the Mesh block the undisplaced mesh will still be used.

Advanced Parameters

Input Files

(problems/debug-precursor-action.i)

(problems/debug-precursor-action.i)

flow_velocity = 147 # Cammi 147 cm/s

[GlobalParams]
  num_groups = 2
  num_precursor_groups = 1
  group_fluxes = 'group1 group2'
  # MSRE full power = 10 MW; core volume 90 ft3
  power = 200000
[]

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 2
  ny = 2
  block_id = 0
  block_name = 'fuel'
[]

[MeshModifiers]
  [mod]
    type = SubdomainBoundingBox
    bottom_left = '0.5 0 0'
    top_right = '1 1 0'
    block_id = 1
    block_name = 'moder'
  []
[]

[Variables]
  # [./pre1]
  # [../]
  [group1]
    order = FIRST
    family = LAGRANGE
  []
  [group2]
    order = FIRST
    family = LAGRANGE
  []
  [temp]
    order = FIRST
    family = LAGRANGE
    scaling = 1e-3
  []
[]

[Kernels]
  # Neutronics
  # [./time_group1]
  #   type = NtTimeDerivative
  #   grou_number = 1
  #   variable = group1
  # [../]
  # [./time_group2]
  #   type = NtTimeDerivative
  #   grou_number = 2
  #   variable = group2
  # [../]
  [diff_group1]
    type = GroupDiffusion
    variable = group1
    group_number = 1
    temperature = temp
  []
  [diff_group2]
    type = GroupDiffusion
    variable = group2
    group_number = 2
    temperature = temp
  []
  [sigma_r_group1]
    type = SigmaR
    variable = group1
    group_number = 1
    temperature = temp
  []
  [sigma_r_group2]
    type = SigmaR
    variable = group2
    group_number = 2
    temperature = temp
  []
  [inscatter_group1]
    type = InScatter
    variable = group1
    group_number = 1
    num_groups = 2
    group_fluxes = 'group1 group2'
    temperature = temp
  []
  [inscatter_group2]
    type = InScatter
    variable = group2
    group_number = 2
    num_groups = 2
    group_fluxes = 'group1 group2'
    temperature = temp
  []
  [fission_source_group1]
    type = CoupledFissionEigenKernel
    variable = group1
    group_number = 1
    num_groups = 2
    group_fluxes = 'group1 group2'
    temperature = temp
  []
  [fission_source_group2]
    type = CoupledFissionEigenKernel
    variable = group2
    group_number = 2
    num_groups = 2
    group_fluxes = 'group1 group2'
    temperature = temp
  []
  # [./fission_source_group1]
  #   type = CoupledFissionKernel
  #   variable = group1
  #   group_number = 1
  #   num_groups = 2
  #   group_fluxes = 'group1 group2'
  # temperature = temp
  # [../]
  # [./fission_source_group2]
  #   type = CoupledFissionKernel
  #   variable = group2
  #   group_number = 2
  #   num_groups = 2
  #   group_fluxes = 'group1 group2'
  # temperature = temp
  # [../]

  # Temperature
  # [./temp_cond]
  #   type = MatDiffusion
  #   variable = temp
  #   prop_name = 'k'
  # [../]
  [temp_flow_fuel]
    block = 'fuel'
    type = MatINSTemperatureRZ
    variable = temp
    rho = 'rho'
    k = 'k'
    cp = 'cp'
    uz = ${flow_velocity}
  []
  [temp_flow_moder]
    block = 'moder'
    type = MatINSTemperatureRZ
    variable = temp
    rho = 'rho'
    k = 'k'
    cp = 'cp'
  []
  [temp_source]
    type = FissionHeatSource
    tot_fissions = tot_fissions
    variable = temp
  []

  #   # Delayed neutron precursors
  # [./pre1_source]
  #   type = PrecursorSource
  #   variable = pre1
  #   precursor_group_number = 1
  #   temperature = temp
  # [../]
  # [./pre1_decay]
  #   type = PrecursorDecay
  #   variable = pre1
  #   precursor_group_number = 2
  #   temperature = temp
  # [../]
[]

[Precursors]
  var_name_base = pre
  # v_def = ${flow_velocity}
  # block = 'fuel'
  inlet_boundary = 'bottom'
  inlet_boundary_condition = 'DirichletBC'
  inlet_dirichlet_value = 0
  outlet_boundary = 'top'
  T = temp
[]

[AuxVariables]
  [Qf]
    family = MONOMIAL
    order = CONSTANT
  []
  # [./diffus_temp]
  #   family = MONOMIAL
  #   order = CONSTANT
  # [../]
  # [./diffus_resid]
  #   family = LAGRANGE
  #   order = FIRST
  # [../]
  # [./src_resid]
  #   family = LAGRANGE
  #   order = FIRST
  # [../]
  # [./bc_resid]
  #   family = LAGRANGE
  #   order = FIRST
  # [../]
  # [./tot_resid]
  #   family = LAGRANGE
  #   order = FIRST
  # [../]
[]

[AuxKernels]
  [Qf]
    type = FissionHeatSourceAux
    variable = Qf
    tot_fissions = tot_fissions
  []
  # [./diffus_temp]
  #   type = MatDiffusionAux
  #   variable = diffus_temp
  #   diffuse_var = temp
  #   prop_name = 'k'
  # [../]
[]

[Materials]
  [fuel]
    type = GenericMoltresMaterial
    block = 'fuel'
    property_tables_root = 'msr2g_enrU_mod_953_fuel_interp_'
    num_groups = 2
    num_precursor_groups = 8
    prop_names = 'k rho cp'
    prop_values = '.0123 3.327e-3 1357' # Cammi 2011 at 908 K
    temperature = temp
  []
  [moder]
    type = GenericMoltresMaterial
    block = 'moder'
    property_tables_root = 'msr2g_enrU_fuel_922_mod_interp_'
    num_groups = 2
    num_precursor_groups = 8
    prop_names = 'k rho cp'
    prop_values = '.312 1.843e-3 1760' # Cammi 2011 at 908 K
    temperature = temp
  []
[]

[BCs]
  [temp_inlet]
    boundary = 'bottom'
    type = DirichletBC
    variable = temp
    value = 900
  []
  [temp_outlet]
    boundary = 'top'
    type = MatINSTemperatureNoBCBC
    variable = temp
    k = 'k'
  []
  [group1_vacuum]
    type = VacuumBC
    variable = group1
    boundary = 'top bottom'
  []
  [group2_vacuum]
    type = VacuumBC
    variable = group2
    boundary = 'top bottom'
  []
[]

[Problem]
  type = FEProblem
  coord_type = RZ
[]

[Executioner]
  type = NonlinearEigen
  free_power_iterations = 2
  source_abs_tol = 1e-12
  source_rel_tol = 1e-8
  output_after_power_iterations = false

  # type = InversePowerMethod
  # max_power_iterations = 50
  # xdiff = 'group1diff'

  bx_norm = 'bnorm'
  k0 = 1.7
  pfactor = 1e-2
  l_max_its = 100

  line_search = none
  # solve_type = 'PJFNK'
  solve_type = 'NEWTON'
  petsc_options = '-snes_converged_reason -ksp_converged_reason -snes_linesearch_monitor -snes_test_display'
  # This system will not converge with default preconditioning; need to use asm
  petsc_options_iname = '-pc_type -sub_pc_type -sub_ksp_type -pc_asm_overlap -ksp_gmres_restart'
  petsc_options_value = 'asm lu preonly 2 31'
  # petsc_options_iname = '-snes_type'
  # petsc_options_value = 'test'
[]

[Preconditioning]
  [SMP]
    type = SMP
    full = true
  []
[]

[Postprocessors]
  [bnorm]
    type = ElmIntegTotFissNtsPostprocessor
    group_fluxes = 'group1 group2'
    execute_on = linear
  []
  [tot_fissions]
    type = ElmIntegTotFissPostprocessor
    execute_on = linear
  []
  [group1norm]
    type = ElementIntegralVariablePostprocessor
    variable = group1
    execute_on = linear
  []
  [group2norm]
    type = ElementIntegralVariablePostprocessor
    variable = group2
    execute_on = linear
  []
  [group1max]
    type = NodalExtremeValue
    value_type = max
    variable = group1
    execute_on = timestep_end
  []
  [group2max]
    type = NodalExtremeValue
    value_type = max
    variable = group2
    execute_on = timestep_end
  []
  [group1diff]
    type = ElementL2Diff
    variable = group1
    execute_on = 'linear timestep_end'
    use_displaced_mesh = false
  []
[]

[Outputs]
  [out]
    type = Exodus
    execute_on = 'timestep_end'
  []
[]

[Debug]
  show_var_residual_norms = true
[]

[ICs]
  [temp_ic]
    type = ConstantIC
    variable = temp
    value = 900
  []
[]

Overview
Example Input File Syntax
Input Parameters
Input Files