NSFunctionInitialCondition

NSFunctionInitialCondition can be used to initialize variables by evaluating fluid properties, using functions for the pressure, temperature and velocity.

Example input file syntax

In this example, we initialize the density at the desired initial temperature and pressure conditions.

[rho]
  type = NSFunctionInitialCondition
  fluid_properties = 'fp'
  initial_pressure = p_func
  initial_temperature = T_func
  initial_velocity = 'vx vy vz'
  variable = 'rho'
[]

Input Parameters

fluid_propertiesThe name of the user object for fluid properties
C++ Type:UserObjectName
Controllable:No
Description:The name of the user object for fluid properties
initial_pressureThe initial pressure
C++ Type:FunctionName
Controllable:No
Description:The initial pressure
initial_temperatureThe initial temperature
C++ Type:FunctionName
Controllable:No
Description:The initial temperature
initial_velocityThe initial velocity
C++ Type:std::vector<FunctionName>
Controllable:No
Description:The initial velocity
variableThe variable this initial condition is supposed to provide values for.
C++ Type:VariableName
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>
Controllable:No
Description:The list of blocks (ids or names) that this object will be applied
boundaryThe list of boundaries (ids or names) from the mesh where this object applies
C++ Type:std::vector<BoundaryName>
Controllable:No
Description:The list of boundaries (ids or names) from the mesh where this object applies
prop_getter_suffixAn optional suffix parameter that can be appended to any attempt to retrieve/get material properties. The suffix will be prepended with a '_' character.
C++ Type:MaterialPropertyName
Controllable:No
Description:An optional suffix parameter that can be appended to any attempt to retrieve/get material properties. The suffix will be prepended with a '_' character.
variable_typeSpecifies what this variable is in the Navier Stokes namespace of variables
C++ Type:MooseEnum
Options:ht, e, Mach, pressure, rho, rhou, rhov, rhow, rho_et, specific_volume, temperature, vel_x, vel_y, vel_z
Controllable:No
Description:Specifies what this variable is in the Navier Stokes namespace of variables

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.
ignore_uo_dependencyFalseWhen set to true, a UserObject retrieved by this IC will not be executed before the this IC
Default:False
C++ Type:bool
Controllable:No
Description:When set to true, a UserObject retrieved by this IC will not be executed before the this IC

Advanced Parameters

(moose/modules/navier_stokes/test/tests/ics/test_function.i)

[Mesh]
  [cartesian]
    type = GeneratedMeshGenerator
    dim = 2
    xmin = 0
    xmax = 1
    ymin = 1
    ymax = 2
    nx = 3
    ny = 3
  []
[]

[FluidProperties]
  [fp]
    type = IdealGasFluidProperties
  []
[]

[Problem]
  kernel_coverage_check = false
  solve = false
  skip_nl_system_check = true
[]

[AuxVariables]
  [pressure]
    type = MooseVariableFVReal
  []
  [vel_x]
    type = MooseVariableFVReal
  []
  [vel_y]
    type = MooseVariableFVReal
  []
  [vel_z]
    type = MooseVariableFVReal
  []
  [temperature]
    type = MooseVariableFVReal
  []
  [ht]
    type = MooseVariableFVReal
  []
  [e]
    type = MooseVariableFVReal
  []
  [Mach]
    type = MooseVariableFVReal
  []
  [rho]
    type = MooseVariableFVReal
  []
  [rhou]
    type = MooseVariableFVReal
  []
  [rhov]
    type = MooseVariableFVReal
  []
  [rhow]
    type = MooseVariableFVReal
  []
  [rho_et]
    type = MooseVariableFVReal
  []
  [specific_volume]
    type = MooseVariableFVReal
  []
  [pressure_2]
  []
  [vel_x_2]
  []
  [vel_y_2]
  []
  [vel_z_2]
  []
  [temperature_2]
  []
  [ht_2]
  []
  [e_2]
  []
  [Mach_2]
  []
  [rho_2]
  []
  [rhou_2]
  []
  [rhov_2]
  []
  [rhow_2]
  []
  [rho_et_2]
  []
  [specific_volume_2]
  []
[]

[GlobalParams]
  fluid_properties = 'fp'
  initial_pressure = p_func
  initial_temperature = T_func
  initial_velocity = 'vx vy vz'
[]

[Functions]
  [p_func]
    type = ParsedFunction
    expression = '3+3+1e5 - x'
  []
  [T_func]
    type = ParsedFunction
    expression = '273.15 + x*y*2'
  []
  [vx]
    type = ParsedFunction
    expression = '14'
  []
  [vy]
    type = ParsedFunction
    expression = '10 + x'
  []
  [vz]
    type = ParsedFunction
    expression = '12 -7*y'
  []
[]

[ICs]
  [p]
    type = NSFunctionInitialCondition
    variable = 'pressure'
  []
  [vel_x]
    type = NSFunctionInitialCondition
    variable = 'vel_x'
  []
  [vel_y]
    type = NSFunctionInitialCondition
    variable = 'vel_y'
  []
  [vel_z]
    type = NSFunctionInitialCondition
    variable = 'vel_z'
  []
  [temperature]
    type = NSFunctionInitialCondition
    variable = 'temperature'
  []
  [ht]
    type = NSFunctionInitialCondition
    variable = 'ht'
  []
  [e]
    type = NSFunctionInitialCondition
    variable = 'e'
  []
  [Mach]
    type = NSFunctionInitialCondition
    variable = 'Mach'
  []
  [rho]
    type = NSFunctionInitialCondition
    fluid_properties = 'fp'
    initial_pressure = p_func
    initial_temperature = T_func
    initial_velocity = 'vx vy vz'
    variable = 'rho'
  []
  [rhou]
    type = NSFunctionInitialCondition
    variable = 'rhou'
  []
  [rhov]
    type = NSFunctionInitialCondition
    variable = 'rhov'
  []
  [rhow]
    type = NSFunctionInitialCondition
    variable = 'rhow'
  []
  [rho_et]
    type = NSFunctionInitialCondition
    variable = 'rho_et'
  []
  [specific_volume]
    type = NSFunctionInitialCondition
    variable = 'specific_volume'
  []
  [p_2]
    type = NSFunctionInitialCondition
    variable = 'pressure_2'
    variable_type = 'pressure'
  []
  [vel_x_2]
    type = NSFunctionInitialCondition
    variable = 'vel_x_2'
    variable_type = 'vel_x'
  []
  [vel_y_2]
    type = NSFunctionInitialCondition
    variable = 'vel_y_2'
      variable_type = 'vel_y'
  []
  [vel_z_2]
    type = NSFunctionInitialCondition
    variable = 'vel_z_2'
      variable_type = 'vel_z'
  []
  [temperature_2]
    type = NSFunctionInitialCondition
    variable = 'temperature_2'
    variable_type = 'temperature'
  []
  [ht_2]
    type = NSFunctionInitialCondition
    variable = 'ht_2'
    variable_type = 'ht'
  []
  [e_2]
    type = NSFunctionInitialCondition
    variable = 'e_2'
    variable_type = 'e'
  []
  [Mach_2]
    type = NSFunctionInitialCondition
    variable = 'Mach_2'
    variable_type = 'Mach'
  []
  [rho_2]
    type = NSFunctionInitialCondition
    variable = 'rho_2'
    variable_type = 'rho'
  []
  [rhou_2]
    type = NSFunctionInitialCondition
    variable = 'rhou_2'
    variable_type = 'rhou'
  []
  [rhov_2]
    type = NSFunctionInitialCondition
    variable = 'rhov_2'
    variable_type = 'rhov'
  []
  [rhow_2]
    type = NSFunctionInitialCondition
    variable = 'rhow_2'
    variable_type = 'rhow'
  []
  [rho_et_2]
    type = NSFunctionInitialCondition
    variable = 'rho_et_2'
    variable_type = 'rho_et'
  []
  [specific_volume_2]
    type = NSFunctionInitialCondition
    variable = 'specific_volume_2'
    variable_type = 'specific_volume'
  []
[]

[Executioner]
  type = Steady
[]

[Debug]
  show_actions = true
[]

[Outputs]
  exodus = true
[]

Example input file syntax
Input Parameters