FVFunctionIC

An initial condition that uses a normal function of x, y, z to produce values (and optionally gradients) for a field variable.

Sets an initial condition via a Function described by parameter "function". It can be restricted to particular blocks using the "block" parameter.

Example input syntax

In this example, we set the initial value of variable u using a ParsedFunction.

[FVICs]
  [u_ic]
    type = FVFunctionIC
    variable = 'u'
    function = parsed_function
  []
[]

[Functions]
  [parsed_function]
    type = ParsedFunction
    expression = 'sin(x)-cos(y/2)'
  []
[]
(moose/test/tests/fvics/function_ic/parsed_function.i)

Input Parameters

  • functionThe initial condition function.

    C++ Type:FunctionName

    Unit:(no unit assumed)

    Controllable:No

    Description:The initial condition function.

  • variableThe variable this initial condition is supposed to provide values for.

    C++ Type:VariableName

    Unit:(no unit assumed)

    Controllable:No

    Description:The variable this initial condition is supposed to provide values for.

Required Parameters

  • blockThe list of blocks (ids or names) that this object will be applied

    C++ Type:std::vector<SubdomainName>

    Unit:(no unit assumed)

    Controllable:No

    Description:The list of blocks (ids or names) that this object will be applied

  • scaling_factor1Scaling factor to apply on the function

    Default:1

    C++ Type:double

    Unit:(no unit assumed)

    Controllable:No

    Description:Scaling factor to apply on the function

  • stateCURRENTThis parameter is used to set old state solutions at the start of simulation. If specifying multiple states at the start of simulation, use one IC object for each state being specified. The states are CURRENT=0 OLD=1 OLDER=2. States older than 2 are not currently supported. When the user only specifies current state, the solution is copied to the old and older states, as expected. This functionality is mainly used for dynamic simulations with explicit time integration schemes, where old solution states are used in the velocity and acceleration approximations.

    Default:CURRENT

    C++ Type:MooseEnum

    Unit:(no unit assumed)

    Options:CURRENT, OLD, OLDER

    Controllable:No

    Description:This parameter is used to set old state solutions at the start of simulation. If specifying multiple states at the start of simulation, use one IC object for each state being specified. The states are CURRENT=0 OLD=1 OLDER=2. States older than 2 are not currently supported. When the user only specifies current state, the solution is copied to the old and older states, as expected. This functionality is mainly used for dynamic simulations with explicit time integration schemes, where old solution states are used in the velocity and acceleration approximations.

Optional Parameters

  • control_tagsAdds user-defined labels for accessing object parameters via control logic.

    C++ Type:std::vector<std::string>

    Unit:(no unit assumed)

    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

    Unit:(no unit assumed)

    Controllable:No

    Description:Set the enabled status of the MooseObject.

Advanced Parameters