BoundingValueNodalDamper

under construction:Undocumented Class

The BoundingValueNodalDamper has not been documented. The content listed below should be used as a starting point for documenting the class, which includes the typical automatic documentation associated with a MooseObject; however, what is contained is ultimately determined by what is necessary to make the documentation clear for users.


# BoundingValueNodalDamper

!syntax description /Dampers/BoundingValueNodalDamper

## Overview

!! Replace these lines with information regarding the BoundingValueNodalDamper object.

## Example Input File Syntax

!! Describe and include an example of how to use the BoundingValueNodalDamper object.

!syntax parameters /Dampers/BoundingValueNodalDamper

!syntax inputs /Dampers/BoundingValueNodalDamper

!syntax children /Dampers/BoundingValueNodalDamper

!syntax description /Dampers/BoundingValueNodalDamper

Input Parameters

variableThe name of the variable that this damper operates on
C++ Type:NonlinearVariableName
Options:
Description:The name of the variable that this damper operates on

Required Parameters

max_value1.79769e+308The maximum permissible iterative value for the variable.
Default:1.79769e+308
C++ Type:double
Options:
Description:The maximum permissible iterative value for the variable.
min_damping0Minimum value of computed damping. Damping lower than this will result in an exception being thrown and cutting the time step
Default:0
C++ Type:double
Options:
Description:Minimum value of computed damping. Damping lower than this will result in an exception being thrown and cutting the time step
min_value-1.79769e+308The minimum permissible iterative value for the variable.
Default:-1.79769e+308
C++ Type:double
Options:
Description:The minimum permissible iterative value for the variable.

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.

Advanced Parameters

Input Files

test/tests/dampers/min_damping/min_nodal_damping.i
test/tests/dampers/bounding_value_nodal_damper/bounding_value_max_test.i
test/tests/dampers/interactions/interacting_node_elem_dampers.i

test/tests/dampers/min_damping/min_nodal_damping.i

[Mesh]
  type = GeneratedMesh
  dim = 1
  nx = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./u_dt]
    type = TimeDerivative
    variable = u
  [../]
  [./u_source]
    type = BodyForce
    variable = u
    value = 1
  [../]
[]

[BCs]
  [./u_left]
    type = DirichletBC
    boundary = left
    variable = u
    value = 0.0
  [../]
[]

[Dampers]
  [./limit]
    type = BoundingValueNodalDamper
    variable = u
    max_value = 1.5
    min_value = -1.5
    min_damping = 0.001
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 2
[]

[Postprocessors]
  [./u_avg]
    type = ElementAverageValue
    variable = u
  [../]
  [./dt]
    type = TimestepSize
  [../]
[]

test/tests/dampers/bounding_value_nodal_damper/bounding_value_max_test.i

# This model tests the BoundingValueNodalDamper. The converged solution
# for u starts out in the range from 0 to 1, but after several steps,
# a volumetric source drives it to a value greater than 1, which is
# outside the range of the damper. At that point, the solution can
# no longer converge, and the model errors out with a failure to converge.
# The test verifies that the damper computes the correct value in the first
# nonlinear iteration when the solution exceeds the bounds.

[Mesh]
  type = GeneratedMesh
  dim = 2
  xmin = 0
  xmax = 1
  ymin = 0
  ymax = 1
  nx = 2
  ny = 2
  elem_type = QUAD9
[]

[Variables]
  [./u]
    order = SECOND
    family = LAGRANGE
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]

  [./source]
    type = BodyForce
    variable = u
    function = 't'
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]

  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Dampers]
  [./bounding_value_damp]
    type = BoundingValueNodalDamper
    min_value = 0.0
    max_value = 1.0
    variable = u
  [../]
[]

[Executioner]
  type = Transient
  solve_type = 'PJFNK'
  end_time = 3.0
  dt = 0.5
  dtmin = 0.5
  nl_max_its = 5
[]

test/tests/dampers/interactions/interacting_node_elem_dampers.i

# This model tests interactions between nodal and element dampers.
# The test verifies that the minimum of the value of a nodal and
# element damper is always used.
# If run with the nodal1 and elem1 dampers active, the element damper
# will govern.  With nodal2 and elem2 dampers, the nodal damper governs.

[Mesh]
  type = GeneratedMesh
  dim = 2
  xmin = 0
  xmax = 1
  ymin = 0
  ymax = 1
  nx = 2
  ny = 2
  elem_type = QUAD9
[]

[Variables]
  [./u]
    order = SECOND
    family = LAGRANGE
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]

  [./source]
    type = BodyForce
    variable = u
    function = 't'
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]

  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Dampers]
  active = 'nodal1 elem1'
  [./nodal1]
    #gives a damping of 0.3333 on step 6
    type = BoundingValueNodalDamper
    min_value = 0.0
    max_value = 1.0
    variable = u
  [../]
  [./elem1]
    #gives a damping of 0.141536 on step 6
    type = BoundingValueElementDamper
    min_value = 0.0
    max_value = 1.012
    variable = u
  [../]
  [./nodal2]
    #gives a damping of 0.3333 on step 6
    type = BoundingValueNodalDamper
    min_value = 0.0
    max_value = 1.0
    variable = u
  [../]
  [./elem2]
    #gives a damping of 0.743318 on step 6
    type = BoundingValueElementDamper
    min_value = 0.0
    max_value = 1.02
    variable = u
  [../]
[]

[Executioner]
  type = Transient
  solve_type = 'PJFNK'
  end_time = 3.0
  dt = 0.5
  dtmin = 0.5
  nl_max_its = 5
[]

Input Parameters
Input Files

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