PiecewiseLinearFromVectorPostprocessor

Description

The PiecewiseLinearFromVectorPostprocessor function performs linear interpolations between pairs of data generated by a vector post-processor object. The abscissa ("argument_column") and the ordinate ("value_column") values should correspond to the names of member vectors of the object specified for the "vectorpostprocessor_name" parameter. By default, the abscissa values correspond to time, and the data will be interpolated at the actual simulation time-step values. However, it is possible to interpolate over spatial (x, y, or z) coordinates by specifying a direction with the "component" parameter, where the inputs, 0, 1, and 2, correspond to the x, y, and z directions, respectively.

Example Input Syntax

In this example, three PiecewiseLinearFromVectorPostprocessors are created and take data from three distinct vector postprocessors. All three functions use a "component" parameter, which is set so they are functions of space rather than time (y for first two, x for the last one).

[Functions<<<{"href": "../../syntax/Functions/index.html"}>>>]
  [ramp_u]
    type = ParsedFunction<<<{"description": "Function created by parsing a string", "href": "MooseParsedFunction.html"}>>>
    expression<<<{"description": "The user defined function."}>>> = 't'
  []
  [point_value_function_u]
    type = VectorPostprocessorFunction<<<{"description": "Provides piecewise linear interpolation of from two columns of a VectorPostprocessor", "href": "PiecewiseLinearFromVectorPostprocessor.html"}>>>
    component<<<{"description": "Component of the function evaluation point used to sample the VectorPostprocessor"}>>> = y
    argument_column<<<{"description": "VectorPostprocessor column tabulating the abscissa of the sampled function"}>>> = y
    value_column<<<{"description": "VectorPostprocessor column tabulating the ordinate (function values) of the sampled function"}>>> = u
    vectorpostprocessor_name<<<{"description": "The name of the VectorPostprocessor that you want to use"}>>> = point_value_vector_postprocessor_u
  []
  [line_value_function_v]
    type = VectorPostprocessorFunction<<<{"description": "Provides piecewise linear interpolation of from two columns of a VectorPostprocessor", "href": "PiecewiseLinearFromVectorPostprocessor.html"}>>>
    component<<<{"description": "Component of the function evaluation point used to sample the VectorPostprocessor"}>>> = y
    argument_column<<<{"description": "VectorPostprocessor column tabulating the abscissa of the sampled function"}>>> = y
    value_column<<<{"description": "VectorPostprocessor column tabulating the ordinate (function values) of the sampled function"}>>> = v
    vectorpostprocessor_name<<<{"description": "The name of the VectorPostprocessor that you want to use"}>>> = line_value_vector_postprocessor_v
  []
  [test_parallel_func]
    type = VectorPostprocessorFunction<<<{"description": "Provides piecewise linear interpolation of from two columns of a VectorPostprocessor", "href": "PiecewiseLinearFromVectorPostprocessor.html"}>>>
    component<<<{"description": "Component of the function evaluation point used to sample the VectorPostprocessor"}>>> = x
    argument_column<<<{"description": "VectorPostprocessor column tabulating the abscissa of the sampled function"}>>> = xx
    value_column<<<{"description": "VectorPostprocessor column tabulating the ordinate (function values) of the sampled function"}>>> = qq
    vectorpostprocessor_name<<<{"description": "The name of the VectorPostprocessor that you want to use"}>>> = test_parallel_vpp
  []
  [function_v]
    type = PiecewiseLinear<<<{"description": "Linearly interpolates between pairs of x-y data", "href": "PiecewiseLinear.html"}>>>
    x<<<{"description": "The abscissa values"}>>> = '0 0.008'
    y<<<{"description": "The ordinate values"}>>> = '1 2'
    axis<<<{"description": "The axis used (x, y, or z) if this is to be a function of position"}>>> = y
  []
[]

[VectorPostprocessors<<<{"href": "../../syntax/VectorPostprocessors/index.html"}>>>]
  [point_value_vector_postprocessor_u]
    type = PointValueSampler<<<{"description": "Sample a variable at specific points.", "href": "../vectorpostprocessors/PointValueSampler.html"}>>>
    variable<<<{"description": "The names of the variables that this VectorPostprocessor operates on"}>>> = u
    points<<<{"description": "The points where you want to evaluate the variables"}>>> = '0 0.001 0 0 0.004 0 0 0.008 0'
    #points = '0.001 0 0 0.002 0 0'
    sort_by<<<{"description": "What to sort the samples by"}>>> = y
    execute_on<<<{"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."}>>> = linear
  []
  [line_value_vector_postprocessor_v]
    type = LineValueSampler<<<{"description": "Samples variable(s) along a specified line", "href": "../vectorpostprocessors/LineValueSampler.html"}>>>
    variable<<<{"description": "The names of the variables that this VectorPostprocessor operates on"}>>> = v
    start_point<<<{"description": "The beginning of the line"}>>> = '0 0.001 0'
    end_point<<<{"description": "The ending of the line"}>>> = '0 0.008 0'
    num_points<<<{"description": "The number of points to sample along the line"}>>> = 5
    sort_by<<<{"description": "What to sort the samples by"}>>> = y
    execute_on<<<{"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."}>>> = linear
  []
  [test_parallel_vpp]
    type = ConstantVectorPostprocessor<<<{"description": "Populate constant VectorPostprocessorValue directly from input file.", "href": "../vectorpostprocessors/ConstantVectorPostprocessor.html"}>>>
    vector_names<<<{"description": "Names of the column vectors in this object"}>>> = 'xx qq'
    value<<<{"description": "Vector values this object will have. Leading dimension must be equal to leading dimension of vector_names parameter."}>>> = '0    1;
             1000 1000'
    execute_on<<<{"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."}>>> = 'initial timestep_begin'
  []
[]

Input Parameters