AverageExtensionRatio

Computes the average extension ratio on deformed mesh between two sets of points

Description

This PostProcessor computes the average extension ratio between two sets of points specified in two arrays defined with the first_point and last_point parameters. The point positions account for the current displacements, so this distance will evolve over time for a deforming body. If the separation between two specific points is desired, single points rather than a arrays of points can be specified.

This PostProcessor computes average extension ratio between a set of points specified in two array first_point and last_point. The extensions between the points with matching positions in these arrays are computed, and then their average is computed. The lengths of these sets of points must be the same.

Example Input File Syntax

[./avg_extension_raio]
  type = AverageExtensionRatio
  first_point = '60.0 0.0 0.0
                   30.0 0.0 0.0'
  last_point = '30.0 0.0 0.0
                    0.0 0.0 0.0'
  displacements = 'disp_x disp_y disp_z'
[../]

Input Parameters

displacementsThe displacements appropriate for the simulation geometry and coordinate system
C++ Type:std::vector<VariableName>
Unit:(no unit assumed)
Controllable:No
Description:The displacements appropriate for the simulation geometry and coordinate system
first_pointA list of first points in the numerical domain
C++ Type:std::vector<libMesh::Point>
Controllable:No
Description:A list of first points in the numerical domain
last_pointA list of last points in the numerical domain
C++ Type:std::vector<libMesh::Point>
Controllable:No
Description:A list of last points in the numerical domain

Required 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
Controllable:No
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).
execute_onTIMESTEP_ENDThe list of flag(s) indicating when this object should be executed. For a description of each flag, see https://mooseframework.inl.gov/source/interfaces/SetupInterface.html.
Default:TIMESTEP_END
C++ Type:ExecFlagEnum
Options:XFEM_MARK, NONE, INITIAL, LINEAR, LINEAR_CONVERGENCE, NONLINEAR, NONLINEAR_CONVERGENCE, POSTCHECK, TIMESTEP_END, TIMESTEP_BEGIN, MULTIAPP_FIXED_POINT_END, MULTIAPP_FIXED_POINT_BEGIN, MULTIAPP_FIXED_POINT_CONVERGENCE, FINAL, CUSTOM, TRANSFER
Controllable:No
Description:The list of flag(s) indicating when this object should be executed. For a description of each flag, see https://mooseframework.inl.gov/source/interfaces/SetupInterface.html.
execution_order_group0Execution order groups are executed in increasing order (e.g., the lowest number is executed first). Note that negative group numbers may be used to execute groups before the default (0) group. Please refer to the user object documentation for ordering of user object execution within a group.
Default:0
C++ Type:int
Controllable:No
Description:Execution order groups are executed in increasing order (e.g., the lowest number is executed first). Note that negative group numbers may be used to execute groups before the default (0) group. Please refer to the user object documentation for ordering of user object execution within a group.
force_postauxFalseForces the UserObject to be executed in POSTAUX
Default:False
C++ Type:bool
Controllable:No
Description:Forces the UserObject to be executed in POSTAUX
force_preauxFalseForces the UserObject to be executed in PREAUX
Default:False
C++ Type:bool
Controllable:No
Description:Forces the UserObject to be executed in PREAUX
force_preicFalseForces the UserObject to be executed in PREIC during initial setup
Default:False
C++ Type:bool
Controllable:No
Description:Forces the UserObject to be executed in PREIC during initial setup

Execution Scheduling 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.
outputsVector of output names where you would like to restrict the output of variables(s) associated with this object
C++ Type:std::vector<OutputName>
Controllable:No
Description:Vector of output names where you would like to restrict the output of variables(s) associated with this object
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

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
Unit:(no unit assumed)
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.
use_interpolated_stateFalseFor the old and older state use projected material properties interpolated at the quadrature points. To set up projection use the ProjectedStatefulMaterialStorageAction.
Default:False
C++ Type:bool
Controllable:No
Description:For the old and older state use projected material properties interpolated at the quadrature points. To set up projection use the ProjectedStatefulMaterialStorageAction.

Material Property Retrieval Parameters

References

No citations exist within this document.

(blackbear/test/tests/AverageExtensionRatio/AverageExtensionRatio.i)

# Test for small strain Euler beam axial loading in x direction.

# Modeling a pipe with an OD of 10 inches and ID of 8 inches
# The length of the pipe is 5 feet (60 inches) and E = 30e6
# G = 11.5384615385e6 with nu = 0.3
# The applied axial load is 50000 lb which results in a
# displacement of 3.537e-3 inches at the end, i.e,  0.005894697 extension

# delta = PL/AE = 50000 * 60 / pi (5^2 - 4^2) * 30e6 = 3.537e-3

# In this analysis the applied force is used as a BC

[Mesh]
  type = GeneratedMesh
  dim = 1
  nx = 10
  xmin = 0.0
  xmax = 60.0
  displacements = 'disp_x disp_y disp_z'
[]

[Variables]
  [./disp_x]
    order = FIRST
    family = LAGRANGE
  [../]
  [./disp_y]
    order = FIRST
    family = LAGRANGE
  [../]
  [./disp_z]
    order = FIRST
    family = LAGRANGE
  [../]
  [./rot_x]
    order = FIRST
    family = LAGRANGE
  [../]
  [./rot_y]
    order = FIRST
    family = LAGRANGE
  [../]
  [./rot_z]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[BCs]
  [./fixx1]
    type = DirichletBC
    variable = disp_x
    boundary = left
    value = 0.0
  [../]
  [./fixy1]
    type = DirichletBC
    variable = disp_y
    boundary = left
    value = 0.0
  [../]
  [./fixz1]
    type = DirichletBC
    variable = disp_z
    boundary = left
    value = 0.0
  [../]
  [./fixr1]
    type = DirichletBC
    variable = rot_x
    boundary = left
    value = 0.0
  [../]
  [./fixr2]
    type = DirichletBC
    variable = rot_y
    boundary = left
    value = 0.0
  [../]
  [./fixr3]
    type = DirichletBC
    variable = rot_z
    boundary = left
    value = 0.0
  [../]
[]

[NodalKernels]
  [./force_x2]
    type = ConstantRate
    variable = disp_x
    boundary = right
    rate = 50000.0
  [../]
[]

[Preconditioning]
  [./smp]
    type = SMP
    full = true
  [../]
[]
[Executioner]
  type = Transient
  solve_type = PJFNK
  line_search = 'none'
  nl_max_its = 15
  nl_rel_tol = 1e-10
  nl_abs_tol = 1e-8

  dt = 1
  dtmin = 1
  end_time = 1
[]

[Kernels]
  [./solid_disp_x]
    type = StressDivergenceBeam
    block = '0'
    displacements = 'disp_x disp_y disp_z'
    rotations = 'rot_x rot_y rot_z'
    component = 0
    variable = disp_x
  [../]
  [./solid_disp_y]
    type = StressDivergenceBeam
    block = '0'
    displacements = 'disp_x disp_y disp_z'
    rotations = 'rot_x rot_y rot_z'
    component = 1
    variable = disp_y
  [../]
  [./solid_disp_z]
    type = StressDivergenceBeam
    block = '0'
    displacements = 'disp_x disp_y disp_z'
    rotations = 'rot_x rot_y rot_z'
    component = 2
    variable = disp_z
  [../]
  [./solid_rot_x]
    type = StressDivergenceBeam
    block = '0'
    displacements = 'disp_x disp_y disp_z'
    rotations = 'rot_x rot_y rot_z'
    component = 3
    variable = rot_x
  [../]
  [./solid_rot_y]
    type = StressDivergenceBeam
    block = '0'
    displacements = 'disp_x disp_y disp_z'
    rotations = 'rot_x rot_y rot_z'
    component = 4
    variable = rot_y
  [../]
  [./solid_rot_z]
    type = StressDivergenceBeam
    block = '0'
    displacements = 'disp_x disp_y disp_z'
    rotations = 'rot_x rot_y rot_z'
    component = 5
    variable = rot_z
  [../]
[]

[AuxVariables]
  [forces_x]
    order = CONSTANT
    family = MONOMIAL
  []
[]

[AuxKernels]
  [forces_x]
    type = MaterialRealVectorValueAux
    property = forces
    variable = forces_x
    execute_on = timestep_end
  []
[]

[Materials]
  [./elasticity]
    type = ComputeElasticityBeam
    shear_coefficient = 1.0
    youngs_modulus = 30e6
    poissons_ratio = 0.3
    block = 0
  [../]
  [./strain]
    type = ComputeIncrementalBeamStrain
    block = '0'
    displacements = 'disp_x disp_y disp_z'
    rotations = 'rot_x rot_y rot_z'
    area = 28.274
    Ay = 0.0
    Az = 0.0
    Iy = 1.0
    Iz = 1.0
    y_orientation = '0.0 1.0 0.0'
  [../]
  [./stress]
    type = ComputeBeamResultants
    block = 0
  [../]
[]

[Postprocessors]
  [./disp_x60]
    type = PointValue
    point = '60.0 0.0 0.0'
    variable = disp_x
  [../]
  [./disp_y60]
    type = PointValue
    point = '60.0 0.0 0.0'
    variable = disp_y
  [../]
  [./disp_x30]
    type = PointValue
    point = '30.0 0.0 0.0'
    variable = disp_x
  [../]
  [./disp_y30]
    type = PointValue
    point = '30.0 0.0 0.0'
    variable = disp_y
  [../]
  [./disp_x0]
    type = PointValue
    point = '0.0 0.0 0.0'
    variable = disp_x
  [../]
  [./disp_y0]
    type = PointValue
    point = '0.0 0.0 0.0'
    variable = disp_y
  [../]
  [./avg_extension_raio]
    type = AverageExtensionRatio
    first_point = '60.0 0.0 0.0
                   30.0 0.0 0.0'
    last_point  = '30.0 0.0 0.0
                    0.0 0.0 0.0'
    displacements = 'disp_x disp_y disp_z'
  [../]
  [./forces_x]
    type = PointValue
    point = '60.0 0.0 0.0'
    variable = forces_x
  [../]
[]

[Outputs]
  csv = true
[]

Description
Example Input File Syntax
Input Parameters
References

Usage

Development

Demonstration