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Functions System

Overview

Functions are used to define functions depending only on spatial position and time: . These objects can serve a wide variety of purposes, including (but not limited to) the following:

  • defining initial conditions,

  • defining residual contributions (sources, boundary conditions, etc.), and

  • defining post-processing quantities.

Available Objects

  • Moose App
  • Axisymmetric2D3DSolutionFunctionFunction for reading a 2D axisymmetric solution from file and mapping it to a 3D Cartesian model
  • BicubicSplineFunction
  • CoarsenedPiecewiseLinearPerform a point reduction of the tabulated data upon initialization, then evaluate using a linear interpolation.
  • CompositeFunctionMultiplies an arbitrary set of functions together
  • ConstantFunction
  • ImageFunctionFunction with values sampled from a given image stack
  • LinearCombinationFunctionReturns the linear combination of the functions
  • ParsedFunctionFunction created by parsing a string
  • ParsedGradFunction
  • ParsedVectorFunction
  • PiecewiseBilinearInterpolates values from a csv file
  • PiecewiseConstantDefines data using a set of x-y data pairs
  • PiecewiseLinearLinearly interpolates between pairs of x-y data
  • PiecewiseMulticonstantPiecewiseMulticonstant performs constant interpolation on 1D, 2D, 3D or 4D data. The data_file specifies the axes directions and the function values. If a point lies outside the data range, the appropriate end value is used.
  • PiecewiseMultilinearPiecewiseMultilinear performs linear interpolation on 1D, 2D, 3D or 4D data. The data_file specifies the axes directions and the function values. If a point lies outside the data range, the appropriate end value is used.
  • SolutionFunction
  • SplineFunction
  • TestSetupPostprocessorDataActionFunction
  • VectorPostprocessorFunctionProvides piecewise linear interpolation of from two columns of a VectorPostprocessor
  • Navier Stokes App
  • WedgeFunctionFunction which computes the exact solution for Jeffery-Hamel flow in a wedge.
  • Functional Expansion Tools App
  • FunctionSeriesThis function uses a convolution of functional series (functional expansion or FX) to create a 1D, 2D, or 3D function
  • Phase Field App
  • FourierNoiseGenerate noise from a fourier series
  • Porous Flow App
  • MovingPlanarFrontThis function defines the position of a moving front. The front is an infinite plane with normal pointing from start_posn to end_posn. The front's distance from start_posn is defined by 'distance', so if the 'distance' function is time dependent, the front's position will change with time. Roughly speaking, the function returns true_value for points lying in between start_posn and start_posn + distance. Precisely speaking, two planes are constructed, both with normal pointing from start_posn to end_posn. The first plane passes through start_posn; the second plane passes through end_posn. Given a point p and time t, this function returns false_value if ANY of the following are true: (a) t<activation_time; (b) t>=deactivation_time; (c) p is 'behind' start_posn (ie, p lies on one side of the start_posn plane and end_posn lies on the other side); (d) p is 'ahead' of the front (ie, p lies one one side of the front and start_posn lies on the other side); (e) the distance between p and the front is greater than active_length. Otherwise, the point is 'in the active zone' and the function returns true_value.
  • Level Set App
  • LevelSetOlssonBubbleImplementation of 'bubble' ranging from 0 to 1.
  • LevelSetOlssonVortexA function for creating vortex velocity fields for level set equation benchmark problems.

Available Actions