CompositeFunction

Multiplies an arbitrary set of functions together

Description

The CompositeFunction type takes an arbitrary set of functions, provided in the functions parameter, evaluates each of them at the appropriate time and position, and multiplies them together. The function can optionally be multiplied by a scale factor, which is specified using the scale_factor parameter.

Example Input Syntax

[Functions]
  [./ff_1]
    type = ParsedFunction
    expression = alpha*alpha*pi
    symbol_names = 'alpha'
    symbol_values = '16'
  [../]

  [./ff_2]
    type = ParsedFunction
    expression = pi*sin(alpha*pi*x)
    symbol_names = 'alpha'
    symbol_values = '16'
  [../]

  [./forcing_func]
    type = CompositeFunction
    functions = 'ff_1 ff_2'
  [../]

  [./bc_func]
    type = ParsedFunction
    expression = sin(alpha*pi*x)
    symbol_names = 'alpha'
    symbol_values = '16'
  [../]
[]

Input Parameters

execute_onLINEARThe list of flag(s) indicating when this object should be executed, the available options include NONE, INITIAL, LINEAR, NONLINEAR, TIMESTEP_END, TIMESTEP_BEGIN, MULTIAPP_FIXED_POINT_END, MULTIAPP_FIXED_POINT_BEGIN, FINAL, CUSTOM, ALWAYS.
Default:LINEAR
C++ Type:ExecFlagEnum
Options:NONE, INITIAL, LINEAR, NONLINEAR, TIMESTEP_END, TIMESTEP_BEGIN, MULTIAPP_FIXED_POINT_END, MULTIAPP_FIXED_POINT_BEGIN, FINAL, CUSTOM, ALWAYS
Controllable:No
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, MULTIAPP_FIXED_POINT_END, MULTIAPP_FIXED_POINT_BEGIN, FINAL, CUSTOM, ALWAYS.
functionsThe functions to be multiplied together.
C++ Type:std::vector<FunctionName>
Controllable:No
Description:The functions to be multiplied together.
scale_factor1Scale factor to be applied to the ordinate values
Default:1
C++ Type:double
Controllable:No
Description:Scale factor to be applied to the ordinate values

Optional 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:No
Description:Set the enabled status of the MooseObject.

Advanced Parameters

(../moose/test/tests/bcs/function_dirichlet_bc/test.i)

###########################################################
# This is a test of Boundary Condition System. The
# FunctionDirichletBC is used to contribute the residuals
# to the boundary term operators in the weak form.
#
# @Requirement F3.40
###########################################################


[Mesh]
  [./square]
    type = GeneratedMeshGenerator
    dim = 2
    nx = 32
    ny = 32
  [../]
[]

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

[Functions]
  [./ff_1]
    type = ParsedFunction
    expression = alpha*alpha*pi
    symbol_names = 'alpha'
    symbol_values = '16'
  [../]

  [./ff_2]
    type = ParsedFunction
    expression = pi*sin(alpha*pi*x)
    symbol_names = 'alpha'
    symbol_values = '16'
  [../]

  [./forcing_func]
    type = CompositeFunction
    functions = 'ff_1 ff_2'
  [../]

  [./bc_func]
    type = ParsedFunction
    expression = sin(alpha*pi*x)
    symbol_names = 'alpha'
    symbol_values = '16'
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./forcing]
    type = BodyForce
    variable = u
    function = forcing_func
  [../]
[]

[BCs]
  [./all]
    type = FunctionDirichletBC
    variable = u
    boundary = 'left right'
    function = bc_func
  [../]
[]

[Executioner]
  type = Steady
  nl_rel_tol = 1e-12
[]

[Outputs]
  execute_on = 'timestep_end'
  exodus = true
[]