FissionRateAxialAux

Computes the amount of fission rate based on relative axial position from the ends of the fuel stack.

Description

The model in FissionRateAxialAux calculates the fission rate from the user defined fuel stack top and bottom with a normalized sixth order polynomial function. $var element = document.getElementById("moose-equation-95233502-9514-4293-aaa4-98b7e452bdda");katex.render(" \\dot{f} = -120.9 \\bar{z}^6 + 362.9 \\bar{z}^5 - 430.0 \\bar{z}^4 + 255.1 \\bar{z}^3 - 79.26 \\bar{z}^2 + 12.17 \\bar{z} + 0.336", element, {displayMode:true,throwOnError:false});$ where $var element = document.getElementById("moose-equation-0a0b009c-d004-49da-b792-3886c7d6bb06");katex.render("\\bar{z}", element, {displayMode:false,throwOnError:false});$ is the normalized current node location, defined as $var element = document.getElementById("moose-equation-63b5d27b-53fb-442b-ac07-0ed397997dd6");katex.render(" \\bar{z} = \\frac{z_{current} - z_{fuel-bottom}}{z_{fuel-top} - z_{fuel-bottom}}", element, {displayMode:true,throwOnError:false});$

Example Input Syntax

[AuxKernels<<<{"href": "../../syntax/AuxKernels/index.html"}>>>]
  [fissionrate]
    type = FissionRateAxialAux<<<{"description": "Computes the amount of fission rate based on relative axial position from the ends of the fuel stack.", "href": "FissionRateAxialAux.html"}>>>
    axis<<<{"description": "The axis used (0, 1, or 2 for x, y, or z)."}>>> = 1
    block<<<{"description": "The list of blocks (ids or names) that this object will be applied"}>>> = 1
    variable<<<{"description": "The name of the variable that this object applies to"}>>> = fission_rate
    value<<<{"description": "The average volumetric fission rate."}>>> = 1.183e19 # corrected average power to 200 W/cm
    fuel_bottom<<<{"description": "The coordinate at the bottom of the fuel stack."}>>> = -2.5
    fuel_top<<<{"description": "The coordinate at the top of the fuel stack."}>>> = 2.5
    function<<<{"description": "The function that describes the fission rate."}>>> = axial_power_ramp
  []
[]

Input Parameters

axisThe axis used (0, 1, or 2 for x, y, or z).
C++ Type:int
Controllable:No
Description:The axis used (0, 1, or 2 for x, y, or z).
valueThe average volumetric fission rate.
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The average volumetric fission rate.
variableThe name of the variable that this object applies to
C++ Type:AuxVariableName
Unit:(no unit assumed)
Controllable:No
Description:The name of the variable that this object applies to

Required Parameters

blockThe list of blocks (ids or names) that this object will be applied
C++ Type:std::vector<SubdomainName>
Controllable:No
Description:The list of blocks (ids or names) that this object will be applied
boundaryThe list of boundaries (ids or names) from the mesh where this object applies
C++ Type:std::vector<BoundaryName>
Controllable:No
Description:The list of boundaries (ids or names) from the mesh where this object applies
check_boundary_restrictedTrueWhether to check for multiple element sides on the boundary in the case of a boundary restricted, element aux variable. Setting this to false will allow contribution to a single element's elemental value(s) from multiple boundary sides on the same element (example: when the restricted boundary exists on two or more sides of an element, such as at a corner of a mesh
Default:True
C++ Type:bool
Controllable:No
Description:Whether to check for multiple element sides on the boundary in the case of a boundary restricted, element aux variable. Setting this to false will allow contribution to a single element's elemental value(s) from multiple boundary sides on the same element (example: when the restricted boundary exists on two or more sides of an element, such as at a corner of a mesh
execute_onLINEAR TIMESTEP_ENDThe list of flag(s) indicating when this object should be executed. For a description of each flag, see https://mooseframework.inl.gov/source/interfaces/SetupInterface.html.
Default:LINEAR TIMESTEP_END
C++ Type:ExecFlagEnum
Options:XFEM_MARK, NONE, INITIAL, LINEAR, NONLINEAR_CONVERGENCE, NONLINEAR, POSTCHECK, TIMESTEP_END, TIMESTEP_BEGIN, MULTIAPP_FIXED_POINT_END, MULTIAPP_FIXED_POINT_BEGIN, FINAL, CUSTOM, PRE_DISPLACE
Controllable:No
Description:The list of flag(s) indicating when this object should be executed. For a description of each flag, see https://mooseframework.inl.gov/source/interfaces/SetupInterface.html.
fuel_bottomThe coordinate at the bottom of the fuel stack.
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The coordinate at the bottom of the fuel stack.
fuel_bottom_boundaryThe bottom boundary of the pellet stack.
C++ Type:unsigned int
Controllable:No
Description:The bottom boundary of the pellet stack.
fuel_topThe coordinate at the top of the fuel stack.
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The coordinate at the top of the fuel stack.
fuel_top_boundaryThe top boundary of the pellet stack.
C++ Type:unsigned int
Controllable:No
Description:The top boundary of the pellet stack.
functionThe function that describes the fission rate.
C++ Type:FunctionName
Unit:(no unit assumed)
Controllable:No
Description:The function that describes the fission rate.

Optional Parameters

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.
enableTrueSet the enabled status of the MooseObject.
Default:True
C++ Type:bool
Controllable:Yes
Description:Set the enabled status of the MooseObject.
seed0The seed for the master random number generator
Default:0
C++ Type:unsigned int
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
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

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.
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
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.

Material Property Retrieval Parameters

Input Files

(test/tests/fission_rate_axial/ssets_deprecated.i)
(test/tests/fission_rate_axial/coords_deprecated.i)

(test/tests/fission_rate_axial/coords_deprecated.i)

[Mesh]
  [mesh]
    type = FileMeshGenerator
    file = 1x5x1.e
  []
[]


[Variables]
  [temp]
    order = FIRST
    family = LAGRANGE
    initial_condition = 1373.15
  []
[]


[AuxVariables]
  [fission_rate]
    order = FIRST
    family = LAGRANGE
  []
[]


[Functions]
  [axial_power_ramp]
    type = PiecewiseLinear
    x = '0 1e4'
    y = '0 1'
  []
[]

[Kernels]
  [heat]
    type = HeatConduction
    variable = temp
  []
[]

[AuxKernels]
  [fissionrate]
    type = FissionRateAxialAux
    axis = 1
    block = 1
    variable = fission_rate
    value = 1.183e19         # corrected average power to 200 W/cm
    fuel_bottom = -2.5
    fuel_top = 2.5
    function = axial_power_ramp
  []
[]

[BCs]
  [bottom_temp]
    type = DirichletBC
    variable = temp
    boundary = 1
    value = 1373.15
  []

  [top_temp]
    type = DirichletBC
    variable = temp
    boundary = 2
    value = 1373.15
  []
[]


[Materials]
  [thermal]
    type = HeatConductionMaterial
    block = 1
    thermal_conductivity = 1.e4
    specific_heat = 1.
  []
[]

[Executioner]
   type = Transient

  solve_type = 'PJFNK'


   petsc_options = '-snes_ksp_ew '
   petsc_options_iname = '-ksp_gmres_restart -pc_type -pc_hypre_type'
   petsc_options_value = '70 hypre boomeramg'
   l_max_its = 60
   nl_rel_tol = 1e-8
   nl_abs_tol = 1e-8
   l_tol = 1e-5
   start_time = 0.0
   end_time   = 1e+4
   dt = 1e+3
   num_steps = 10
[]

[Outputs]
  exodus = true
[]

(test/tests/fission_rate_axial/ssets_deprecated.i)

[Mesh]
  [mesh]
    type = FileMeshGenerator
    file = 1x5x1.e
  []
[]


[Variables]
  [temp]
    order = FIRST
    family = LAGRANGE
    initial_condition = 1373.15
  []
[]


[AuxVariables]
  [fission_rate]
    order = FIRST
    family = LAGRANGE
  []
[]


[Functions]
  [axial_power_ramp]
    type = PiecewiseLinear
    x = '0 1e4'
    y = '0 1'
  []
[]

[Kernels]
  [heat]
    type = HeatConduction
    variable = temp
  []
[]

[AuxKernels]
  [fissionrate]
    type = FissionRateAxialAux
    axis = 1
    block = 1
    variable = fission_rate
    value = 1.183e19         # corrected average power to 200 W/cm
    fuel_bottom_boundary = 1
    fuel_top_boundary = 2
    function = axial_power_ramp
  []
[]

[BCs]
  [bottom_temp]
    type = DirichletBC
    variable = temp
    boundary = 1
    value = 1373.15
  []

  [top_temp]
    type = DirichletBC
    variable = temp
    boundary = 2
    value = 1373.15
  []
[]


[Materials]
  [thermal]
    type = HeatConductionMaterial
    block = 1
    thermal_conductivity = 1.e4
    specific_heat = 1.
  []
[]

[Executioner]
   type = Transient

  solve_type = 'PJFNK'


   petsc_options = '-snes_ksp_ew '
   petsc_options_iname = '-ksp_gmres_restart -pc_type -pc_hypre_type'
   petsc_options_value = '70 hypre boomeramg'
   l_max_its = 60
   nl_rel_tol = 1e-8
   nl_abs_tol = 1e-8
   l_tol = 1e-5
   start_time = 0.0
   end_time   = 1e+4
   dt = 1e+3
   num_steps = 10
[]

[Outputs]
  exodus = true
[]

(test/tests/fission_rate_axial/coords_deprecated.i)

[Mesh]
  [mesh]
    type = FileMeshGenerator
    file = 1x5x1.e
  []
[]


[Variables]
  [temp]
    order = FIRST
    family = LAGRANGE
    initial_condition = 1373.15
  []
[]


[AuxVariables]
  [fission_rate]
    order = FIRST
    family = LAGRANGE
  []
[]


[Functions]
  [axial_power_ramp]
    type = PiecewiseLinear
    x = '0 1e4'
    y = '0 1'
  []
[]

[Kernels]
  [heat]
    type = HeatConduction
    variable = temp
  []
[]

[AuxKernels]
  [fissionrate]
    type = FissionRateAxialAux
    axis = 1
    block = 1
    variable = fission_rate
    value = 1.183e19         # corrected average power to 200 W/cm
    fuel_bottom = -2.5
    fuel_top = 2.5
    function = axial_power_ramp
  []
[]

[BCs]
  [bottom_temp]
    type = DirichletBC
    variable = temp
    boundary = 1
    value = 1373.15
  []

  [top_temp]
    type = DirichletBC
    variable = temp
    boundary = 2
    value = 1373.15
  []
[]


[Materials]
  [thermal]
    type = HeatConductionMaterial
    block = 1
    thermal_conductivity = 1.e4
    specific_heat = 1.
  []
[]

[Executioner]
   type = Transient

  solve_type = 'PJFNK'


   petsc_options = '-snes_ksp_ew '
   petsc_options_iname = '-ksp_gmres_restart -pc_type -pc_hypre_type'
   petsc_options_value = '70 hypre boomeramg'
   l_max_its = 60
   nl_rel_tol = 1e-8
   nl_abs_tol = 1e-8
   l_tol = 1e-5
   start_time = 0.0
   end_time   = 1e+4
   dt = 1e+3
   num_steps = 10
[]

[Outputs]
  exodus = true
[]

Description
Example Input Syntax
Input Parameters
Input Files