InfiniteCylinderRadiativeBC

Boundary condition for radiative heat exchange with a cylinderwhere the boundary is approximated as a cylinder as well.

This boundary condition computes the radiative heat flux from the boundary to an infinite cylinder completely surrounding it. The boundary itself is assumed to be a cylinder that is concentric to the enclosing cylinder. Geometry information is provided by boundary_radius and cylinder_radius parameters. The mesh is not queried for geometric information.

[./radiative_bc]
  type = InfiniteCylinderRadiativeBC
  boundary = right
  variable = temp
  boundary_radius = 2
  boundary_emissivity = 0.2
  cylinder_radius = 3
  cylinder_emissivity = 0.7
  Tinfinity = 500
[../]

Input Parameters

boundaryThe list of boundary IDs from the mesh where this object applies
C++ Type:std::vector<BoundaryName>
Controllable:No
Description:The list of boundary IDs from the mesh where this object applies
boundary_radiusRadius of the boundary approximated as cylinder.
C++ Type:double
Controllable:No
Description:Radius of the boundary approximated as cylinder.
cylinder_radiusRadius of the cylinder on the outside of the boundary.
C++ Type:double
Controllable:No
Description:Radius of the cylinder on the outside of the boundary.
variableThe name of the variable that this residual object operates on
C++ Type:NonlinearVariableName
Controllable:No
Description:The name of the variable that this residual object operates on

Required Parameters

Tinfinity0Temperature of the body in radiative heat transfer.
Default:0
C++ Type:FunctionName
Controllable:No
Description:Temperature of the body in radiative heat transfer.
boundary_emissivity1Emissivity of the boundary.
Default:1
C++ Type:double
Controllable:No
Description:Emissivity of the boundary.
cylinder_emissivity1Emissivity of the cylinder in radiative heat transfer with the boundary.
Default:1
C++ Type:double
Controllable:No
Description:Emissivity of the cylinder in radiative heat transfer with the boundary.
displacementsThe displacements
C++ Type:std::vector<VariableName>
Controllable:No
Description:The displacements
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
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.
stefan_boltzmann_constant5.67037e-08The Stefan-Boltzmann constant.
Default:5.67037e-08
C++ Type:double
Controllable:No
Description:The Stefan-Boltzmann constant.

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>
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>
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>
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
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
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>
Controllable:No
Description:Adds user-defined labels for accessing object parameters via control logic.
diag_save_inThe name of auxiliary variables to save this BC'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>
Controllable:No
Description:The name of auxiliary variables to save this BC'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
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
Controllable:No
Description:Determines whether this object is calculated using an implicit or explicit form
save_inThe name of auxiliary variables to save this BC'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>
Controllable:No
Description:The name of auxiliary variables to save this BC'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
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

(moose/modules/heat_conduction/test/tests/radiative_bcs/radiative_bc_cyl.i)

#
# Thin cylindrical shell with very high thermal conductivity
# so that temperature is almost uniform at 500 K. Radiative
# boundary conditions is applied. Heat flux out of boundary
# 'right' should be 3723.36; this is approached as the mesh
# is refined
#

[Mesh]
  type = MeshGeneratorMesh
  [./cartesian]
    type = CartesianMeshGenerator
    dim = 2
    dx = '1 1'
    ix = '1 10'
    dy = '1 1'
    subdomain_id = '1 2 1 2'
  [../]

  [./remove_1]
    type = BlockDeletionGenerator
    block = 1
    input = cartesian
  [../]

  [./readd_left]
    type = ParsedGenerateSideset
    combinatorial_geometry = 'abs(x - 1) < 1e-4'
    new_sideset_name = left
    input = remove_1
  [../]
[]

[Problem]
  coord_type = RZ
[]

[Variables]
  [./temp]
    initial_condition = 800.0
  [../]
[]

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

[BCs]
  [./lefttemp]
    type = DirichletBC
    boundary = left
    variable = temp
    value = 800
  [../]

  [./radiative_bc]
    type = InfiniteCylinderRadiativeBC
    boundary = right
    variable = temp
    boundary_radius = 2
    boundary_emissivity = 0.2
    cylinder_radius = 3
    cylinder_emissivity = 0.7
    Tinfinity = 500
  [../]
[]

[Materials]
  [./density]
    type = GenericConstantMaterial
    prop_names = 'density  thermal_conductivity'
    prop_values = '1 1.0e5'
  [../]
[]

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

[Executioner]
  type = Steady
  petsc_options = '-snes_converged_reason'
  line_search = none
  nl_rel_tol = 1e-6
  nl_abs_tol = 1e-7
[]

[Postprocessors]
  [./right]
    type = SideDiffusiveFluxAverage
    variable = temp
    boundary = right
    diffusivity = thermal_conductivity
  [../]

  [./min_temp]
    type = ElementExtremeValue
    variable = temp
    value_type = min
  [../]

  [./max_temp]
    type = ElementExtremeValue
    variable = temp
    value_type = max
  [../]
[]

[Outputs]
  csv = true
[]

Input Parameters