FVBoundaryIntegralValueConstraint

This object implements the residuals that enforce the constraint

using a Lagrange multiplier approach. E.g. this object enforces the constraint that the average value of match on the prescribed boundary (denoted by in the equation above). This object is the boundary version of the volumetric object FVIntegralValueConstraint.

warningwarning

The contribution to the diagonal of the system of this kernel is null, which introduces a saddle point. Make sure to use a NONZERO shift in your preconditioner.

Example input syntax

In this example, the average value of the variable v is set on the right boundary using a FVBoundaryIntegralValueConstraint. In combination with a single Dirichlet boundary condition on the left boundary, this makes the numerical problem accept a single numerical solution, and be well-posed.

[FVBCs]
  [left]
    type = FVDirichletBC
    variable = v
    boundary = left
    value = 7
  []
  [right]
    type = FVBoundaryIntegralValueConstraint
    variable = v
    boundary = right
    phi0 = 42
    lambda = lambda
  []
[]
(../moose/test/tests/fvkernels/fv_simple_diffusion/dirichlet-constrained-average-value.i)

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

  • lambdaLagrange multiplier variable

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

    Controllable:No

    Description:Lagrange multiplier variable

  • variableThe name of the variable that this boundary condition applies to

    C++ Type:NonlinearVariableName

    Controllable:No

    Description:The name of the variable that this boundary condition applies to

Required Parameters

  • displacementsThe displacements

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

    Controllable:No

    Description:The displacements

  • phi00The value that the constraint will enforce.

    Default:0

    C++ Type:PostprocessorName

    Controllable:No

    Description:The value that the constraint will enforce.

  • 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.

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.

  • 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

  • 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