FVFunctionDirichletBC

Imposes the essential boundary condition $var element = document.getElementById("moose-equation-f8eeda91-5e99-4a0f-b970-ff574302d6e6");katex.render("u=g(t,\\vec{x})", element, {displayMode:false,throwOnError:false});$ , where $var element = document.getElementById("moose-equation-275ea97e-28e3-4652-86c5-ca6137e1b39c");katex.render("g", element, {displayMode:false,throwOnError:false});$ is a (possibly) time and space-dependent MOOSE Function.

Overview

FVFunctionDirichletBC is very similar to FVDirichletBC except the parameter value is replaced by the function parameter, where the latter is a FunctionName or alternatively a direct input of a parsed function. FVFunctionDirichletBC is generally useful; it's critical for implementing MMS studies.

Example Input File Syntax

[FVBCs]
  [boundary]
    type = FVFunctionDirichletBC
    boundary = 'left right'
    function = 'exact'
    variable = v
  []
[]

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
functionThe exact solution function.
C++ Type:FunctionName
Unit:(no unit assumed)
Controllable:No
Description:The exact solution function.
variableThe name of the variable that this boundary condition applies to
C++ Type:NonlinearVariableName
Unit:(no unit assumed)
Controllable:No
Description:The name of the variable that this boundary condition applies to

Required Parameters

displacementsThe displacements
C++ Type:std::vector<VariableName>
Unit:(no unit assumed)
Controllable:No
Description:The displacements

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_tagssystemThe tag for the matrices this Kernel should fill
Default:system
C++ Type:MultiMooseEnum
Unit:(no unit assumed)
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
Unit:(no unit assumed)
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>
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
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

(moose/test/tests/fvkernels/mms/advection-diffusion.i)

diff=1.1
a=1.1

[GlobalParams]
  advected_interp_method = 'average'
[]

[Mesh]
  [./gen_mesh]
    type = GeneratedMeshGenerator
    dim = 1
    xmin = -0.6
    xmax = 0.6
    nx = 64
  [../]
[]

[Variables]
  [./v]
    family = MONOMIAL
    order = CONSTANT
    fv = true
  [../]
[]

[FVKernels]
  [./advection]
    type = FVAdvection
    variable = v
    velocity = '${a} 0 0'
  [../]
  [./diffusion]
    type = FVDiffusion
    variable = v
    coeff = coeff
  [../]
  [body_v]
    type = FVBodyForce
    variable = v
    function = 'forcing'
  []
[]

[FVBCs]
  [boundary]
    type = FVFunctionDirichletBC
    boundary = 'left right'
    function = 'exact'
    variable = v
  []
[]

[Materials]
  [diff]
    type = ADGenericFunctorMaterial
    prop_names = 'coeff'
    prop_values = '${diff}'
  []
[]

[Functions]
  [exact]
    type = ParsedFunction
    expression = '3*x^2 + 2*x + 1'
  []
  [forcing]
    type = ParsedFunction
    expression = '-${diff}*6 + ${a} * (6*x + 2)'
    # expression = '-${diff}*6'
  []
[]

[Executioner]
  type = Steady
  solve_type = 'NEWTON'
[]

[Outputs]
  exodus = true
  csv = true
[]

[Postprocessors]
  [./error]
    type = ElementL2Error
    variable = v
    function = exact
    outputs = 'console csv'
    execute_on = 'timestep_end'
  [../]
  [h]
    type = AverageElementSize
    outputs = 'console csv'
    execute_on = 'timestep_end'
  []
[]

Overview
Example Input File Syntax
Input Parameters