PointValueAtXFEMInterface

Obtain field values and gradients on the interface.

Description

The values of field variables on either side of a moving interface are often needed to define the interface velocity. These variables and their gradients might be discontinuous across the interface. The fact that the interface does not lie on the standard quadrature points makes it difficult to get the quantities on the interface using existing functions in MOOSE.

PointValueAtXFEMInterface provides functions to return the value of a field variable and its gradient on the positive and negative sides of the interface. The PointValueAtXFEMInterface object is used by the XFEMMovingInterfaceVelocityBase derived class to calculate the velocity of the interface for moving interface problems.

Example Input File Syntax


[./value_uo]
  type = PointValueAtXFEMInterface
  variable = 'u'
  geometric_cut_userobject = 'moving_line_segments'
  execute_on = 'nonlinear'
  level_set_var = ls
[../]
(modules/xfem/test/tests/moving_interface/phase_transition.i)

Input Parameters

  • level_set_varThe name of level set variable used to represent the interface

    C++ Type:VariableName

    Options:

    Description:The name of level set variable used to represent the interface

  • variableThe name of the variable that this UserObject operates on

    C++ Type:VariableName

    Options:

    Description:The name of the variable that this UserObject operates on

Required Parameters

  • execute_onTIMESTEP_ENDThe list of flag(s) indicating when this object should be executed, the available options include NONE, INITIAL, LINEAR, NONLINEAR, TIMESTEP_END, TIMESTEP_BEGIN, FINAL, CUSTOM.

    Default:TIMESTEP_END

    C++ Type:ExecFlagEnum

    Options:NONE INITIAL LINEAR NONLINEAR TIMESTEP_END TIMESTEP_BEGIN FINAL CUSTOM

    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, FINAL, CUSTOM.

  • geometric_cut_userobjectName of GeometricCutUserObject that provides the points to this UserObject.

    C++ Type:UserObjectName

    Options:

    Description:Name of GeometricCutUserObject that provides the points to this UserObject.

Optional Parameters

  • control_tagsAdds user-defined labels for accessing object parameters via control logic.

    C++ Type:std::vector

    Options:

    Description:Adds user-defined labels for accessing object parameters via control logic.

  • enableTrueSet the enabled status of the MooseObject.

    Default:True

    C++ Type:bool

    Options:

    Description:Set the enabled status of the MooseObject.

  • allow_duplicate_execution_on_initialFalseIn the case where this UserObject is depended upon by an initial condition, allow it to be executed twice during the initial setup (once before the IC and again after mesh adaptivity (if applicable).

    Default:False

    C++ Type:bool

    Options:

    Description:In the case where this UserObject is depended upon by an initial condition, allow it to be executed twice during the initial setup (once before the IC and again after mesh adaptivity (if applicable).

  • 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

    Options:

    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.

  • force_preauxFalseForces the GeneralUserObject to be executed in PREAUX

    Default:False

    C++ Type:bool

    Options:

    Description:Forces the GeneralUserObject to be executed in PREAUX

Advanced Parameters

Input Files

References