VariableOldValueBoundsAux

Uses the old variable values as the bounds for the new solve.

Description

VariableOldValueBoundsAux is used to set the bound for bounded_variable to be its old value. The bound type of upper or lower is set with bound_type parameter. VariableOldValueBoundsAux expects a variable parameter to be set (as do all AuxKernels). This can be a dummy AuxVariable; the VariableOldValueBoundsAux actually operates on NumericVectors held by the nonlinear system and does nothing but return 0 for the value of the specified variable.

Note that in order for these bounds to have an effect, the user has to specify the PETSc options -snes_type vinewtonssls or -snes_type vinewtonrsls. A warning will be generated if neither options are specified. MOOSE users can also specify bound with a constant using ConstantBoundsAux.

Example Syntax

[Bounds]
  [u_upper_bound]
    type = ConstantBoundsAux
    variable = bounds_dummy
    bounded_variable = u
    bound_type = upper
    bound_value = 1
  []
  [u_lower_bound]
    type = VariableOldValueBoundsAux
    variable = bounds_dummy
    bounded_variable = u
    bound_type = lower
  []

  [v_upper_bound]
    type = ConstantBoundsAux
    variable = bounds_dummy
    bounded_variable = v
    bound_type = upper
    bound_value = 3
  []
  [v_lower_bound]
    type = VariableOldValueBoundsAux
    variable = bounds_dummy
    bounded_variable = v
    bound_type = lower
  []
[]
(../moose/test/tests/auxkernels/bounds/old_value_bounds.i)

Input Parameters

  • bounded_variableThe variable to be bounded

    C++ Type:NonlinearVariableName

    Controllable:No

    Description:The variable to be bounded

  • variableThe name of the variable that this object applies to

    C++ Type:AuxVariableName

    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

  • bound_typeupperType of bound. 'upper' refers to the upper bound. 'lower' refers to the lower value.

    Default:upper

    C++ Type:MooseEnum

    Options:upper, lower

    Controllable:No

    Description:Type of bound. 'upper' refers to the upper bound. 'lower' refers to the lower value.

  • 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, the available options include NONE, INITIAL, LINEAR, NONLINEAR, TIMESTEP_END, TIMESTEP_BEGIN, MULTIAPP_FIXED_POINT_END, MULTIAPP_FIXED_POINT_BEGIN, FINAL, CUSTOM, ALWAYS, PRE_DISPLACE.

    Default:LINEAR TIMESTEP_END

    C++ Type:ExecFlagEnum

    Options:NONE, INITIAL, LINEAR, NONLINEAR, TIMESTEP_END, TIMESTEP_BEGIN, MULTIAPP_FIXED_POINT_END, MULTIAPP_FIXED_POINT_BEGIN, FINAL, CUSTOM, ALWAYS, PRE_DISPLACE

    Controllable:No

    Description:The list of flag(s) indicating when this object should be executed, the available options include NONE, INITIAL, LINEAR, NONLINEAR, TIMESTEP_END, TIMESTEP_BEGIN, MULTIAPP_FIXED_POINT_END, MULTIAPP_FIXED_POINT_BEGIN, FINAL, CUSTOM, ALWAYS, PRE_DISPLACE.

  • 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

  • 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