The functions object holds all function objects, identified by user defined identifiers. A function must be one of the specified types. Functions are used to describe mathematical behavior.

Example Usage:

functions: [ { label: "constant_1", constant: { value: 1 } }, { label: "linear_ramp", piecewise_linear: { abscissa: [ 0, 1 ], ordinate: [ 0, 1 ] } } ]

This object is used to define a piecewise linear function which will linearly interpolate between the given values.

Example Usage:

piecewise_linear: { abscissa: [ 0, 1 ], ordinate: [ 0, 1 ] }

One of the given keywords must be defined to specify the function ordinate dimension

This object defines constant function properties.

Example Usage:

constant: { value: 1 }

One of the given keywords must be defined to specify the dimension of the functions return value.

A custom function specified with Julia. A separate Julia file can be referenced with the julia-file object, or the function can be written inline with the julia-function object. The function takes in a three-dimensional point as the first argument and a scalar time as the second argument, and must return a vector or a scalar. The solver adds to and modifies this function. As such, it should not be defined within a module. DO NOT repeat function names. Julia allows functions to be redefined without error or warning. We do have some rudimentary guards in place that will save the simulation if names are shared across very simple files or functions. However, in more complicated situations these guards can fail. The guards mainly protect against typical quick copy and paste errors.

Example Usage:

custom_julia: { return_type: "vector", julia_file: { function_name: "stresscontour", file_name: "plate_with_hole_stress.jl" } }

This object points to a separate Julia file for use in the function.

Example Usage:

julia_file: { function_name: "stresscontour", file_name: "plate_with_hole_stress.jl" }

This object holds a Julia function, written inline, for use in the function.

Import an exodus file that describes the function evaluation. This function type is currently only supported for temperature distribution load conditions for solid mechanics procedures.

Julia function that will operate on the exodus function output. The function must take a scalar value and a time argument and return a single scalar. This field is optional, and if omittied the exodus function value will be used unaltered.