PostprocessorDirichletBC

Dirichlet boundary condition with value prescribed by a Postprocessor value.

More information about Dirichlet boundary conditions and their mathematical meaning may be found in the DirichletBC documentation.

A common postprocessor input for the PostprocessorDirichletBC is the Receiver postprocessor, which is populated by a transfer from a MultiApp System. The two simulations are then coupled through this boundary condition, by setting the value of a variable on a boundary.

Example Input Syntax

This example demonstrates the use case outlined above with PostprocessorDirichletBC on the right boundary for variables x and y. The postprocessor input to the boundary conditions are incoming_x and incoming_y respectively.

[Postprocessors]
  [./incoming_x]
    type = Receiver
    execute_on = 'TIMESTEP_BEGIN'
  [../]
  [./incoming_y]
    type = Receiver
    execute_on = 'TIMESTEP_BEGIN'
  [../]
[]

[BCs]
  [./right_x]
    type = PostprocessorDirichletBC
    variable = x
    boundary = 'right'
    postprocessor = incoming_x
  [../]
  [./left_y]
    type = DirichletBC
    variable = y
    boundary = 'left'
    value = 0
  [../]
  [./right_y]
    type = PostprocessorDirichletBC
    variable = y
    boundary = 'right'
    postprocessor = incoming_y
  [../]
  [./left_x]
    type = DirichletBC
    variable = x
    boundary = 'left'
    value = 0
  [../]
[]
(moose/test/tests/multiapps/centroid_multiapp/sub_app.i)

Input Parameters

  • boundaryThe list of boundary IDs from the mesh where this object applies

    C++ Type:std::vector<BoundaryName>

    Unit:(no unit assumed)

    Controllable:No

    Description:The list of boundary IDs from the mesh where this object applies

  • postprocessorThe postprocessor to set the value to on the boundary.

    C++ Type:PostprocessorName

    Unit:(no unit assumed)

    Controllable:No

    Description:The postprocessor to set the value to on the boundary.

  • 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

  • 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>

    Unit:(no unit assumed)

    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.)

  • displacementsThe displacements

    C++ Type:std::vector<VariableName>

    Unit:(no unit assumed)

    Controllable:No

    Description:The displacements

  • 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>

    Unit:(no unit assumed)

    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.)

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_tagssystem timeThe tag for the matrices this Kernel should fill

    Default:system time

    C++ Type:MultiMooseEnum

    Unit:(no unit assumed)

    Options:nontime, system, time

    Controllable:No

    Description:The tag for the matrices this Kernel should fill

  • vector_tagsresidualThe tag for the vectors this Kernel should fill

    Default:residual

    C++ Type:MultiMooseEnum

    Unit:(no unit assumed)

    Options:nontime, time, residual

    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.

  • 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

  • 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