CoolantAux

Saves either the enthalpy, the coolant temperature, the heat flux, or the coolant fluid qualitys as computed by the coolant channel model, for easy output.

Description

warning:CoolantAux Use Limitations

The CoolantAux can only be used as First Lagrange variable, if the nodal variable settings are used. This object may only be used with the IAWPS95 submodule to calculate quantities with water as the coolant fluid. !alert-end!

CoolantAux is intended as an aid in the use of the BISON coolant channel model and computes four quantities of interest in SI units. The enthalpy is calculated as $var element = document.getElementById("moose-equation-3c4da4bb-e6a4-4bad-b516-cd542fd633cc");katex.render(" H = \\frac{Q}{\\dot{m}_{inlet}\\textrm{ A}} + H_{inlet}", element, {displayMode:true,throwOnError:false});$ where $var element = document.getElementById("moose-equation-24af5a73-e6b5-4d15-a9c0-083d4b25364b");katex.render("Q", element, {displayMode:false,throwOnError:false});$ is the heat input calculated as an integral over the axial height of the fuel rod, $var element = document.getElementById("moose-equation-5717548a-43b2-4e12-a9da-ddc18616d187");katex.render("\\dot{m}_{inlet}", element, {displayMode:false,throwOnError:false});$ is in the mass flux at the coolant inlet, $var element = document.getElementById("moose-equation-fb1e2bee-41ae-4ba3-a964-783419a7667d");katex.render("H_{inlet}", element, {displayMode:false,throwOnError:false});$ is the enthalpy at the inlet. The coolant flow area is defined as $var element = document.getElementById("moose-equation-f41fea72-76ed-4dc1-a2a2-07679c80e48b");katex.render(" A = p^2 - \\frac{\\pi d^2}{4}", element, {displayMode:true,throwOnError:false});$ where $var element = document.getElementById("moose-equation-726ae7b0-024f-4ea2-a92d-5b878510da35");katex.render("p", element, {displayMode:false,throwOnError:false});$ is the pitch and $var element = document.getElementById("moose-equation-98f5bf13-f851-435c-af88-1c386f742c9c");katex.render("d", element, {displayMode:false,throwOnError:false});$ is the rod diameter.

The coolant temperature is given as $var element = document.getElementById("moose-equation-5c02e944-2c0e-4d4a-b629-868c7a5ef27f");katex.render(" T_{coolant} = T_{inlet} + \\frac{Q}{\\dot{m}_{inlet}\\textrm{ A }V_{inlet} E_{inlet}}", element, {displayMode:true,throwOnError:false});$ where $var element = document.getElementById("moose-equation-413688e4-f205-4ab2-8b62-c7e0e2f21ae0");katex.render("V_{inlet}", element, {displayMode:false,throwOnError:false});$ is the inlet specific volume and $var element = document.getElementById("moose-equation-336253ad-bf64-4582-808c-65d9d12564cc");katex.render("E_{inlet}", element, {displayMode:false,throwOnError:false});$ is the internal energy at the inlet.

The quality of the coolant water fluid is determined directly by the IAWPS95 submodule.

The heat flux is calculated in a 1-D manner as a function of the temperature gradient in the radial direction $var element = document.getElementById("moose-equation-4019e4f3-73aa-496c-b570-dd2a58e8e6c9");katex.render(" \\dot{q} = -k \\nabla_r T", element, {displayMode:true,throwOnError:false});$ where $var element = document.getElementById("moose-equation-7cc69b78-718f-42f6-8296-696d81013ba1");katex.render("k", element, {displayMode:false,throwOnError:false});$ is the thermal conductivity.

Example Input Syntax

[AuxKernels<<<{"href": "../../syntax/AuxKernels/index.html"}>>>]
  [coolant]
    type = CoolantAux<<<{"description": "Saves either the enthalpy, the coolant temperature, the heat flux, or the coolant fluid qualitys as computed by the coolant channel model, for easy output.", "href": "CoolantAux.html"}>>>
    temperature<<<{"description": "Coupled variable."}>>> = temp
    inlet_temperature<<<{"description": "Inlet temperature in K."}>>> = 559 # K
    inlet_pressure<<<{"description": "Inlet pressure in Pa."}>>> = 15.5E6 # Pa
    inlet_massflux<<<{"description": "Inlet mass flux in kg/m^2-sec."}>>> = 3886 # kg/m^2-sec
    rod_diameter<<<{"description": "Rod diameter in meter"}>>> = 0.95e-2 # m
    rod_pitch<<<{"description": "Rod pitch in meter"}>>> = 1.26e-2 # m
    linear_heat_rate<<<{"description": "Linear heat generation rate in W/m."}>>> = linear_heat_rate
    axial_power_profile<<<{"description": "Axial power profile."}>>> = axial_power_profile
    variable<<<{"description": "The name of the variable that this object applies to"}>>> = coolant_temperature # K
    AuxVarOption<<<{"description": "option for selecting returned aux var: 1 for enthalpy; 2 for coolant temperature."}>>> = 2 # output coolant temperature
    execute_on<<<{"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."}>>> = timestep_end
  []
[]

note:For Use in Conjunction with the CoolantChannel

This object is intended to be used with the CoolantChannel action.

Input Parameters

inlet_massfluxInlet mass flux in kg/m^2-sec.
C++ Type:FunctionName
Unit:(no unit assumed)
Controllable:No
Description:Inlet mass flux in kg/m^2-sec.
inlet_pressureInlet pressure in Pa.
C++ Type:FunctionName
Unit:(no unit assumed)
Controllable:No
Description:Inlet pressure in Pa.
inlet_temperatureInlet temperature in K.
C++ Type:FunctionName
Unit:(no unit assumed)
Controllable:No
Description:Inlet temperature in K.
rod_diameterRod diameter in meter
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:Rod diameter in meter
rod_pitchRod pitch in meter
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:Rod pitch in meter
temperatureCoupled variable.
C++ Type:std::vector<VariableName>
Unit:(no unit assumed)
Controllable:No
Description:Coupled variable.
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

AuxVarOption1option for selecting returned aux var: 1 for enthalpy; 2 for coolant temperature.
Default:1
C++ Type:int
Controllable:No
Description:option for selecting returned aux var: 1 for enthalpy; 2 for coolant temperature.
axial_power_profileAxial power profile.
C++ Type:FunctionName
Unit:(no unit assumed)
Controllable:No
Description:Axial power profile.
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
coolant_materialwaterThe name of the user object with fluid properties.
Default:water
C++ Type:UserObjectName
Controllable:No
Description:The name of the user object with fluid properties.
enthalpy_objectThe CoolantChannelUserObject object for computing enthalpy.
C++ Type:UserObjectName
Controllable:No
Description:The CoolantChannelUserObject object for computing enthalpy.
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.
heat_fluxHeat flux in W/m^2-K.
C++ Type:FunctionName
Unit:(no unit assumed)
Controllable:No
Description:Heat flux in W/m^2-K.
linear_heat_rateLinear heat generation rate in W/m.
C++ Type:FunctionName
Unit:(no unit assumed)
Controllable:No
Description:Linear heat generation rate in W/m.

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/coolant_channel_model/boiling_htc_type_3.i)
(test/tests/coolant_channel_model/boiling_htc_type_2.i)
(test/tests/coolant_channel_model/full_length_clad.i)
(test/tests/coolant_channel_model/thom_correlation.i)
(test/tests/coolant_channel_model/boiling_htc_type_4.i)

(test/tests/coolant_channel_model/full_length_clad.i)

#--------------------------------------------------------------------------------
# Test the input of linear power and axial power profile
#
# Full length PWR cladding tube
# coarse mesh, RxH = 2x10
# Dittus-Boelter correlation
#
# Input linear power and axial power profile to provide the heat source for
# coolant channel enthalpy calculation.
#
#--------------------------------------------------------------------------------
[Mesh]
  coord_type = RZ
  [mesh]
    type = FileMeshGenerator
    file = pwr_clad_rz_coarse.e
  []
[]

[DefaultElementQuality]
  aspect_ratio_upper_bound = 1285
[]

[Variables]
  [temp]
    initial_condition = 300
  []
[]
[AuxVariables]
  [coolant_temperature]
    order = CONSTANT
    family = MONOMIAL
  []
[]

[AuxKernels]
  [coolant]
    type = CoolantAux
    temperature = temp
    inlet_temperature = 559       # K
    inlet_pressure    = 15.5E6    # Pa
    inlet_massflux    = 3886      # kg/m^2-sec
    rod_diameter      = 0.95e-2   # m
    rod_pitch         = 1.26e-2   # m
    linear_heat_rate    = linear_heat_rate
    axial_power_profile = axial_power_profile
    variable          = coolant_temperature # K
    AuxVarOption      = 2         # output coolant temperature
    execute_on = timestep_end
  []
[]

[Functions]
     [heat_flux]
       type = PiecewiseBilinear
       data_file = inner_heatflux.csv
       scale_factor = 1
       axis = 1
    []
    [linear_heat_rate]
       type = PiecewiseLinear
       x = ' 0 5     10   '
       y = ' 0 17800 17800'
    []
    [axial_power_profile]
       type = PiecewiseBilinear
       data_file = axial_power_profile.csv
       scale_factor = 1
       axis = 1
    []
[]

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

[BCs]
  [clad_inner_surface]
    type = FunctionNeumannBC
    boundary = 1
    function = heat_flux
    variable = temp
  []
  [top_clad]
    type = NeumannBC
    boundary = 2
    value = 0
    variable = temp
  []
  [bottom_clad]
    type = NeumannBC
    boundary = 4
    value = 0
    variable = temp
  []
[]

[CoolantChannel]
  [clad_outer_surface]
    boundary          = 3
    variable          = temp
    inlet_temperature = 559       # K
    inlet_pressure    = 15.5E6    # Pa
    inlet_massflux    = 3886      # kg/m^2-sec
    rod_diameter      = 0.95e-2   # m
    rod_pitch         = 1.26e-2   # m
    linear_heat_rate    = linear_heat_rate
    axial_power_profile = axial_power_profile
    heat_transfer_mode = 2        # D-B correlation
  []
[]

[Materials]
  [clad_thermal]
    type = HeatConductionMaterial
    thermal_conductivity = 16.0  # W/m-K
    specific_heat = 330.0        # J/kg-K
  []
  [density]
    type = ParsedMaterial
    property_name = density
    expression = 6551.0 # kg/m^3
  []
[]

[Executioner]
  type = Transient

  petsc_options_iname = '-pc_type -pc_hypre_type '
  petsc_options_value = 'hypre    boomeramg      '
  line_search = 'none'

  l_max_its  = 200
  l_tol      = 1e-5
  nl_max_its = 15
  nl_rel_tol = 1e-7
  nl_abs_tol = 1e-9

  dt         = 1.0
  end_time   = 10.0
[]

[Postprocessors]
  [clad_inner_surface_flux]  # area integrated heat flux at clad inner surface
    type = HeatFluxIntegral
    variable = temp
    boundary = 1
    axial_length = 3.66
    thermal_conductivity = thermal_conductivity
  []
  [clad_outer_surface_flux]  # area integrated heat flux at clad outer surface
    type = HeatFluxIntegral
    variable = temp
    boundary = 3
    axial_length = 3.66
    thermal_conductivity = thermal_conductivity
  []
[]

[Outputs]
  exodus = true
[]

(test/tests/coolant_channel_model/boiling_htc_type_3.i)

################################################################################
#
# This case is prepared for testing boiling heat transfer calculation
# evaluated at the cladding outer surface for RZ geometry.
#
# Test case geometry clad_rz_short_rev2.e has:
#
#  Number of dimensions     = 2
#  Number of sidesets       = 4
#  Number of nodesets       = 0
#  Number of bc sets        = 1
#  Number of elements       = 10
#  Number of nodes          = 18
#
#  Tin  = 550    K
#  Tsat = 558.98 K
#
#  qin  = 636619.77 W/m^2-K
#  qout = 578745.25 W/m^2-K
#
#  Last update on 3/15/2012
#
#  heat transfer mode determined internally ( D-B, Thom, and Chen)
#--------------------------------------------------------------------------------
[Mesh]
  coord_type = RZ
  [mesh]
    type = FileMeshGenerator
    file = clad_rz_short_rev2.e
  []
[]

[DefaultElementQuality]
  aspect_ratio_upper_bound = 241
[]

[Variables]
  [temp]
    initial_condition = 550
  []
[]

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

[Functions]
  [outer_heat_flux] # clad outer surface heat flux
     type = PiecewiseLinear
     x = '0  50'
     y = '0  578745.25'
  []
  [inner_heat_flux] # clad inner surface heat flux
     type = PiecewiseLinear
     x = '0  50'
     y = '0  636619.77'
  []
[]

[AuxVariables]
   [coolant_quality]
     order = CONSTANT
     family = MONOMIAL
   []
[]

[AuxKernels]
   [coolant]
      type = CoolantAux
      temperature = temp
      inlet_temperature = 550       # K
      inlet_pressure    = 7.0E6    # Pa
      inlet_massflux    = 1000      # kg/m^2-sec
      rod_diameter      = 1.10e-2   # m
      rod_pitch         = 1.26e-2   # m
      heat_flux         = outer_heat_flux # W/m^2
      variable          = coolant_quality #
      execute_on = timestep_end
      AuxVarOption      = 4
   []
[]

[BCs]
  [clad_inner_surface]
    type = FunctionNeumannBC
    boundary = 1
    function = inner_heat_flux
    variable = temp
  []
  [top_clad]
    type = NeumannBC
    boundary = 2
    value = 0
    variable = temp
  []
  [bottom_clad]
    type = NeumannBC
    boundary = 4
    value = 0
    variable = temp
  []
[]

[CoolantChannel]
  [clad_outer_surface]
    boundary          = 3
    variable          = temp
    inlet_temperature = 550       # K
    inlet_pressure    = 7.0E6     # Pa
    inlet_massflux    = 1000      # kg/m^2-sec
    rod_diameter      = 1.10e-2   # m
    rod_pitch         = 1.26e-2   # m
    heat_flux         = outer_heat_flux # W/m^2
    htc_correlation_type = 3      #
  []
[]

[Materials]
  [clad_thermal]
    type = HeatConductionMaterial
    thermal_conductivity = 16.0  # W/m-K
    specific_heat = 330.0        # J/kg-K
  []
  [density]
    type = ParsedMaterial
    property_name = density
    expression = 6551.0 # kg/m^3
  []
[]

[Executioner]
   type = Transient

   l_max_its  = 200
   l_tol      = 8e-3
   nl_max_its = 15
   nl_rel_tol = 1e-5
   nl_abs_tol = 1e-10

   dt         = 5.0
   end_time   = 50.0
[]


[Postprocessors]
  [clad_inner_surface_flux]  # area integrated heat flux at clad inner surface
    type = SideDiffusiveFluxIntegral
    variable = temp
    boundary = 1
    diffusivity = thermal_conductivity
  []
  [clad_outer_surface_flux]  # area integrated heat flux at clad outer surface
    type = SideDiffusiveFluxIntegral
    variable = temp
    boundary = 3
    diffusivity = thermal_conductivity
  []
[]

[Outputs]
  exodus = true
[]

(test/tests/coolant_channel_model/boiling_htc_type_2.i)

################################################################################
#
# This case is prepared for testing boiling heat transfer calculation
# evaluated at the cladding outer surface for RZ geometry.
#
# Test case geometry clad_rz_short_rev2.e has:
#
#  Number of dimensions     = 2
#  Number of sidesets       = 4
#  Number of nodesets       = 0
#  Number of bc sets        = 1
#  Number of elements       = 10
#  Number of nodes          = 18
#
#  Tin  = 550    K
#  Tsat = 558.98 K
#
#  qin  = 636619.77 W/m^2-K
#  qout = 578745.25 W/m^2-K
#
#
#  heat transfer mode determined internally ( D-B, J-L, and S-G)
#
#  Single phase liquid,            Dittus-Boelter
#  Sub-cooled nucleate boiling,    Jen-Lottes
#  Saturated boiling,              Jen-Lottes
#  Forced convection vaporization, Shrock-Grossman
#
#  CHF type = GE
#--------------------------------------------------------------------------------

[Mesh]
  coord_type = RZ
  [mesh]
    type = FileMeshGenerator
    file = clad_rz_short_rev2.e
  []
[]

[DefaultElementQuality]
  aspect_ratio_upper_bound = 241
[]

[Variables]
  [temp]
    initial_condition = 550
  []
[]

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

[Functions]
  [outer_heat_flux] # clad outer surface heat flux
     type = PiecewiseLinear
     x = '0  50'
     y = '0  578745.25'
  []
  [inner_heat_flux] # clad inner surface heat flux
     type = PiecewiseLinear
     x = '0  50'
     y = '0  636619.77'
  []
[]

[AuxVariables]
   [coolant_quality]
     order = CONSTANT
     family = MONOMIAL
   []
   [hmode]
     order = CONSTANT
     family = MONOMIAL
   []
   [htype]
     order = CONSTANT
     family = MONOMIAL
   []
[]

[AuxKernels]
  [coolant]
    type = CoolantAux
    temperature = temp
    inlet_temperature = 550       # K
    inlet_pressure    = 7.0E6    # Pa
    inlet_massflux    = 1000      # kg/m^2-sec
    rod_diameter      = 1.10e-2   # m
    rod_pitch         = 1.26e-2   # m
    heat_flux         = outer_heat_flux # W/m^2
    variable          = coolant_quality #
    execute_on = timestep_end
    AuxVarOption      = 4
  []
  [hmode]
    type = MaterialRealAux
    property = coolant_channel_hmode
    variable = hmode
    boundary = 3
    execute_on = 'initial timestep_end'
  []
  [htype]
    type = MaterialRealAux
    property = coolant_channel_htype
    variable = htype
    boundary = 3
  []
[]

[BCs]
  [clad_inner_surface]
    type = FunctionNeumannBC
    boundary = 1
    function = inner_heat_flux
    variable = temp
  []
  [top_clad]
    type = NeumannBC
    boundary = 2
    value = 0
    variable = temp
  []
  [bottom_clad]
    type = NeumannBC
    boundary = 4
    value = 0
    variable = temp
  []
[]

[CoolantChannel]
  [clad_outer_surface]
    boundary          = 3
    variable          = temp
    inlet_temperature = 550       # K
    inlet_pressure    = 7.0E6     # Pa
    inlet_massflux    = 1000      # kg/m^2-sec
    rod_diameter      = 1.10e-2   # m
    rod_pitch         = 1.26e-2   # m
    heat_flux         = outer_heat_flux # W/m^2
    chf_correlation_type = 2      # GE
    htc_correlation_type = 2      # DB -- J-L -- SG
    model_post_chf    = false
  []
[]

[Materials]
  [clad_thermal]
    type = HeatConductionMaterial
    thermal_conductivity = 16.0  # W/m-K
    specific_heat = 330.0        # J/kg-K
  []
  [density]
    type = ParsedMaterial
    property_name = density
    expression = 6551.0 # kg/m^3
  []
[]

[Executioner]
  type = Transient

  line_search = 'bt'

  l_max_its  = 200
  l_tol      = 8e-3
  nl_max_its = 15
  nl_rel_tol = 1e-5
  nl_abs_tol = 1e-10

  dt         = 5.0
  end_time   = 50.0
[]

[Postprocessors]
  [clad_inner_surface_flux]  # area integrated heat flux at clad inner surface
    type = SideDiffusiveFluxIntegral
    variable = temp
    boundary = 1
    diffusivity = thermal_conductivity
  []
  [clad_outer_surface_flux]  # area integrated heat flux at clad outer surface
    type = SideDiffusiveFluxIntegral
    variable = temp
    boundary = 3
    diffusivity = thermal_conductivity
  []
[]

[Outputs]
  exodus = true
[]

(test/tests/coolant_channel_model/full_length_clad.i)

#--------------------------------------------------------------------------------
# Test the input of linear power and axial power profile
#
# Full length PWR cladding tube
# coarse mesh, RxH = 2x10
# Dittus-Boelter correlation
#
# Input linear power and axial power profile to provide the heat source for
# coolant channel enthalpy calculation.
#
#--------------------------------------------------------------------------------
[Mesh]
  coord_type = RZ
  [mesh]
    type = FileMeshGenerator
    file = pwr_clad_rz_coarse.e
  []
[]

[DefaultElementQuality]
  aspect_ratio_upper_bound = 1285
[]

[Variables]
  [temp]
    initial_condition = 300
  []
[]
[AuxVariables]
  [coolant_temperature]
    order = CONSTANT
    family = MONOMIAL
  []
[]

[AuxKernels]
  [coolant]
    type = CoolantAux
    temperature = temp
    inlet_temperature = 559       # K
    inlet_pressure    = 15.5E6    # Pa
    inlet_massflux    = 3886      # kg/m^2-sec
    rod_diameter      = 0.95e-2   # m
    rod_pitch         = 1.26e-2   # m
    linear_heat_rate    = linear_heat_rate
    axial_power_profile = axial_power_profile
    variable          = coolant_temperature # K
    AuxVarOption      = 2         # output coolant temperature
    execute_on = timestep_end
  []
[]

[Functions]
     [heat_flux]
       type = PiecewiseBilinear
       data_file = inner_heatflux.csv
       scale_factor = 1
       axis = 1
    []
    [linear_heat_rate]
       type = PiecewiseLinear
       x = ' 0 5     10   '
       y = ' 0 17800 17800'
    []
    [axial_power_profile]
       type = PiecewiseBilinear
       data_file = axial_power_profile.csv
       scale_factor = 1
       axis = 1
    []
[]

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

[BCs]
  [clad_inner_surface]
    type = FunctionNeumannBC
    boundary = 1
    function = heat_flux
    variable = temp
  []
  [top_clad]
    type = NeumannBC
    boundary = 2
    value = 0
    variable = temp
  []
  [bottom_clad]
    type = NeumannBC
    boundary = 4
    value = 0
    variable = temp
  []
[]

[CoolantChannel]
  [clad_outer_surface]
    boundary          = 3
    variable          = temp
    inlet_temperature = 559       # K
    inlet_pressure    = 15.5E6    # Pa
    inlet_massflux    = 3886      # kg/m^2-sec
    rod_diameter      = 0.95e-2   # m
    rod_pitch         = 1.26e-2   # m
    linear_heat_rate    = linear_heat_rate
    axial_power_profile = axial_power_profile
    heat_transfer_mode = 2        # D-B correlation
  []
[]

[Materials]
  [clad_thermal]
    type = HeatConductionMaterial
    thermal_conductivity = 16.0  # W/m-K
    specific_heat = 330.0        # J/kg-K
  []
  [density]
    type = ParsedMaterial
    property_name = density
    expression = 6551.0 # kg/m^3
  []
[]

[Executioner]
  type = Transient

  petsc_options_iname = '-pc_type -pc_hypre_type '
  petsc_options_value = 'hypre    boomeramg      '
  line_search = 'none'

  l_max_its  = 200
  l_tol      = 1e-5
  nl_max_its = 15
  nl_rel_tol = 1e-7
  nl_abs_tol = 1e-9

  dt         = 1.0
  end_time   = 10.0
[]

[Postprocessors]
  [clad_inner_surface_flux]  # area integrated heat flux at clad inner surface
    type = HeatFluxIntegral
    variable = temp
    boundary = 1
    axial_length = 3.66
    thermal_conductivity = thermal_conductivity
  []
  [clad_outer_surface_flux]  # area integrated heat flux at clad outer surface
    type = HeatFluxIntegral
    variable = temp
    boundary = 3
    axial_length = 3.66
    thermal_conductivity = thermal_conductivity
  []
[]

[Outputs]
  exodus = true
[]

(test/tests/coolant_channel_model/thom_correlation.i)

################################################################################
#
# This case is prepared for testing boiling heat transfer calculation
# evaluated at the cladding outer surface for RZ geometry.
#
#
#
#
#  Tin  = 600.0 K
#  Tsat = 617.9 K
#
#  qin max   = 636619.77 W/m^2-K
#  qout max  = 578745.25 W/m^2-K
#
#  Created on 2/15/13
#
#  heat transfer mode 3 (Thom)
#--------------------------------------------------------------------------------
[Mesh]
  coord_type = RZ
  [mesh]
    type = FileMeshGenerator
    file = clad_rz_short_rev2.e
  []
[]

[DefaultElementQuality]
  aspect_ratio_upper_bound = 241
[]

[Variables]
  [temp]
    initial_condition = 600
  []
[]

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

[Functions]
  [outer_heat_flux] # clad outer surface heat flux
     type = PiecewiseLinear
     x = '0  50'
     y = '0  578745.25'
  []
  [inner_heat_flux] # clad inner surface heat flux
     type = PiecewiseLinear
     x = '0  50'
     y = '0  636619.77'
  []
[]

[AuxVariables]
   [coolant_enthalpy]
     order = CONSTANT
     family = MONOMIAL
   []
[]

[AuxKernels]
  [coolant]
    type = CoolantAux
    temperature = temp
    inlet_temperature = 553       # K
    inlet_pressure    = 15.5E6    # Pa
    inlet_massflux    = 1000      # kg/m^2-sec
    rod_diameter      = 1.10e-2   # m
    rod_pitch         = 1.26e-2   # m
    heat_flux         = outer_heat_flux # W/m^2
    variable          = coolant_enthalpy # J/kg
    execute_on = timestep_end
  []
[]

[BCs]
  [clad_inner_surface]
    type = FunctionNeumannBC
    boundary = 1
    function = inner_heat_flux
    variable = temp
  []
  [top_clad]
    type = NeumannBC
    boundary = 2
    value = 0
    variable = temp
  []
  [bottom_clad]
    type = NeumannBC
    boundary = 4
    value = 0
    variable = temp
  []
[]

[CoolantChannel]
  [clad_outer_surface]
    boundary          = 3
    variable          = temp
    inlet_temperature = 600       # K
    inlet_pressure    = 15.5E6    # Pa
    inlet_massflux    = 1000      # kg/m^2-sec
    rod_diameter      = 1.10e-2   # m
    rod_pitch         = 1.26e-2   # m
    heat_flux         = outer_heat_flux # W/m^2
    heat_transfer_mode = 3
    htc_correlation_type = 1      # Thom
  []
[]

[Materials]
  [clad_thermal]
    type = HeatConductionMaterial
    thermal_conductivity = 16.0  # W/m-K
    specific_heat = 330.0        # J/kg-K
  []
  [density]
    type = ParsedMaterial
    property_name = density
    expression = 6551.0 # kg/m^3
  []
[]

[Executioner]
  type = Transient

  petsc_options_iname = '-pc_type -pc_factor_mat_solver_package -ksp_gmres_restart'
  petsc_options_value = 'lu       superlu_dist                  101'
  line_search = 'none'

  l_max_its = 200
  l_tol = 8e-3
  nl_max_its = 15
  nl_rel_tol = 1e-5
  nl_abs_tol = 1e-10

  dt = 5.0
  end_time = 50.0
[]


[Postprocessors]
  [clad_inner_surface_flux]  # area integrated heat flux at clad inner surface
    type = SideDiffusiveFluxIntegral
    variable = temp
    boundary = 1
    diffusivity = thermal_conductivity
  []
  [clad_outer_surface_flux]  # area integrated heat flux at clad outer surface
    type = SideDiffusiveFluxIntegral
    variable = temp
    boundary = 3
    diffusivity = thermal_conductivity
  []
[]

[Outputs]
  exodus = true
[]

(test/tests/coolant_channel_model/boiling_htc_type_4.i)

################################################################################
#
# This case is prepared for testing boiling heat transfer calculation
# evaluated at the cladding outer surface for RZ geometry.
#
# Test case geometry clad_rz_short_rev2.e has:
#
#  Number of dimensions     = 2
#  Number of sidesets       = 4
#  Number of nodesets       = 0
#  Number of bc sets        = 1
#  Number of elements       = 10
#  Number of nodes          = 18
#
#  Tin  = 550    K
#  Tsat = 558.98 K
#
#  qin  = 636619.77 W/m^2-K
#  qout = 578745.25 W/m^2-K
#
#  Last update on 3/15/2012
#
#  heat transfer mode determined internally ( D-B, Thom, and S-G)
#--------------------------------------------------------------------------------
[Mesh]
  coord_type = RZ
  [mesh]
    type = FileMeshGenerator
    file = clad_rz_short_rev2.e
  []
[]

[DefaultElementQuality]
  aspect_ratio_upper_bound = 241
[]

[Variables]
  [temp]
    initial_condition = 550
  []
[]

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

[Functions]
  [outer_heat_flux] # clad outer surface heat flux
     type = PiecewiseLinear
     x = '0  50'
     y = '0  578745.25'
  []
  [inner_heat_flux] # clad inner surface heat flux
     type = PiecewiseLinear
     x = '0  50'
     y = '0  636619.77'
  []
[]

[AuxVariables]
  [coolant_quality]
    order = CONSTANT
    family = MONOMIAL
  []
[]

[AuxKernels]
  [coolant]
    type = CoolantAux
    temperature = temp
    inlet_temperature = 550       # K
    inlet_pressure    = 7.0E6    # Pa
    inlet_massflux    = 1000      # kg/m^2-sec
    rod_diameter      = 1.10e-2   # m
    rod_pitch         = 1.26e-2   # m
    heat_flux         = outer_heat_flux # W/m^2
    variable          = coolant_quality #
    execute_on = timestep_end
    AuxVarOption      = 4
  []
[]

[BCs]
  [clad_inner_surface]
    type = FunctionNeumannBC
    boundary = 1
    function = inner_heat_flux
    variable = temp
  []
  [top_clad]
    type = NeumannBC
    boundary = 2
    value = 0
    variable = temp
  []
  [bottom_clad]
    type = NeumannBC
    boundary = 4
    value = 0
    variable = temp
  []
[]

[CoolantChannel]
  [clad_outer_surface]
    boundary          = 3
    variable          = temp
    inlet_temperature = 550       # K
    inlet_pressure    = 7.0E6     # Pa
    inlet_massflux    = 1000      # kg/m^2-sec
    rod_diameter      = 1.10e-2   # m
    rod_pitch         = 1.26e-2   # m
    heat_flux         = outer_heat_flux # W/m^2
    htc_correlation_type = 4      #
  []
[]

[Materials]
  [clad_thermal]
    type = HeatConductionMaterial
    thermal_conductivity = 16.0  # W/m-K
    specific_heat = 330.0        # J/kg-K
  []
  [density]
    type = ParsedMaterial
    property_name = density
    expression = 6551.0 # kg/m^3
  []
[]

[Executioner]
  type = Transient

  line_search = 'bt'

  l_max_its = 200
  l_tol = 8e-3
  nl_max_its = 15
  nl_rel_tol = 1e-5
  nl_abs_tol = 1e-10

  dt = 5.0
  end_time = 50.0
[]

[Postprocessors]
  [clad_inner_surface_flux]  # area integrated heat flux at clad inner surface
    type = SideDiffusiveFluxIntegral
    variable = temp
    boundary = 1
    diffusivity = thermal_conductivity
  []
  [clad_outer_surface_flux]  # area integrated heat flux at clad outer surface
    type = SideDiffusiveFluxIntegral
    variable = temp
    boundary = 3
    diffusivity = thermal_conductivity
  []
[]

[Outputs]
  exodus = true
[]

Description
Example Input Syntax
Input Parameters
Input Files