ElementAverageSecondTimeDerivative

Computes the element averaged second derivative of variable

Description

This class computes the average value of the variable's second time derivative for each element.

Input Parameters

variableThe name of the variable that this object operates on
C++ Type:std::vector
Options:
Description:The name of the variable that this object operates on

Required Parameters

blockThe list of block ids (SubdomainID) that this object will be applied
C++ Type:std::vector
Options:
Description:The list of block ids (SubdomainID) that this object will be applied
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 TRANSFER
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.

Optional Parameters

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).
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.
implicitTrueDetermines whether this object is calculated using an implicit or explicit form
Default:True
C++ Type:bool
Options:
Description:Determines whether this object is calculated using an implicit or explicit form
outputsVector of output names were you would like to restrict the output of variables(s) associated with this object
C++ Type:std::vector
Options:
Description:Vector of output names were you would like to restrict the output of variables(s) associated with this object
seed0The seed for the master random number generator
Default:0
C++ Type:unsigned int
Options:
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
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.

Advanced Parameters

Input Files

test/tests/time_integrators/newmark-beta/newmark_beta_default_parameters.i
test/tests/time_integrators/newmark-beta/newmark_beta_prescribed_parameters.i

test/tests/time_integrators/newmark-beta/newmark_beta_default_parameters.i

###########################################################
# This is a simple test with a time-dependent problem
# demonstrating the use of the TimeIntegrator system.
#
# Testing that the first and second time derivatives
# are calculated correctly using the Newmark-Beta method
#
# @Requirement F1.30
###########################################################

[Mesh]
  type = GeneratedMesh
  dim = 2
  xmin = -1
  xmax = 1
  ymin = -1
  ymax = 1
  nx = 1
  ny = 1
[]

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

[Functions]
  [./forcing_fn]
    type = PiecewiseLinear
    x = '0.0 0.1 0.2    0.3  0.4    0.5  0.6'
    y = '0.0 0.0 0.0025 0.01 0.0175 0.02 0.02'
  [../]
[]

[Kernels]
  [./ie]
    type = TimeDerivative
    variable = u
  [../]

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

[BCs]
  [./left]
    type = FunctionDirichletBC
    variable = u
    preset = false
    boundary = 'left'
    function = forcing_fn
  [../]
  [./right]
    type = FunctionDirichletBC
    variable = u
    preset = false
    boundary = 'right'
    function = forcing_fn
  [../]
[]

[Executioner]
  type = Transient

  # Time integrator scheme
  scheme = "newmark-beta"

  start_time = 0.0
  num_steps = 6
  dt = 0.1
[]

[Postprocessors]
  [./udot]
    type = ElementAverageTimeDerivative
    variable = u
  [../]
  [./udotdot]
    type = ElementAverageSecondTimeDerivative
    variable = u
  [../]
  [./u]
    type = ElementAverageValue
    variable = u
  [../]
[]

[Outputs]
  csv = true
[]

test/tests/time_integrators/newmark-beta/newmark_beta_prescribed_parameters.i

###########################################################
# This is a simple test with a time-dependent problem
# demonstrating the use of the TimeIntegrator system.
#
# Testing that the first and second time derivatives
# are calculated correctly using the Newmark-Beta method
#
# @Requirement F1.30
###########################################################

[Mesh]
  type = GeneratedMesh
  dim = 2
  xmin = -1
  xmax = 1
  ymin = -1
  ymax = 1
  nx = 1
  ny = 1
[]

[Variables]
  [u]
  []
[]

[Functions]
  [forcing_fn]
    type = PiecewiseLinear
    x = '0.0 0.1 0.2    0.3  0.4    0.5  0.6'
    y = '0.0 0.0 0.0025 0.01 0.0175 0.02 0.02'
  []
[]

[Kernels]
  [ie]
    type = TimeDerivative
    variable = u
  []

  [diff]
    type = Diffusion
    variable = u
  []
[]

[BCs]
  [left]
    type = FunctionDirichletBC
    variable = u
    boundary = 'left'
    function = forcing_fn
  []
  [right]
    type = FunctionDirichletBC
    variable = u
    boundary = 'right'
    function = forcing_fn
  []
[]

[Executioner]
  type = Transient
  start_time = 0.0
  num_steps = 6
  dt = 0.1
  [TimeIntegrator]
    type = NewmarkBeta
    beta = 0.4225
    gamma = 0.8
  []
[]

[Postprocessors]
  [udot]
    type = ElementAverageTimeDerivative
    variable = u
  []
  [udotdot]
    type = ElementAverageSecondTimeDerivative
    variable = u
  []
  [u]
    type = ElementAverageValue
    variable = u
  []
[]

[Outputs]
  csv = true
[]

Description
Input Parameters
Input Files

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ElementAverageSecondTimeDerivative

Description

Input Parameters

Required Parameters

Optional Parameters

Advanced Parameters

Input Files