WCNSFVInletVelocityBC

Defines a Dirichlet boundary condition for finite volume method.

There are two options for specifying a component of the inlet velocity:

  • specifying a velocity postprocessor

  • specifying a mass flow rate postprocessor and a density functor. The functor is usually a functor material property, defined by a GeneralFunctorFluidProps. The scaling factor can be used to account for projections if the inlet flow and the surface are not aligned.

This boundary condition works with postprocessors, which may be replaced by constant values in the input. The intended use case for this boundary condition is to be receiving its value from a coupled application, using a Receiver postprocessor.

commentnote

Specifying the inlet velocity using a WCNSFVInletVelocityBC will not preserve mass or momentum flow at the boundary in most cases, in part because of the discretization error. Specifying incoming mass and momentum fluxes using a WCNSFVMassFluxBC and a WCNSFVMomentumFluxBC is currently the only conservative approach.

Example input syntax

In this example input, the boundary conditions to the mass conservation equation and the momentum equations are specified using two WCNSFVInletVelocityBC, one for each component of the velocity. The inlet velocity is specified using a mass flow rate postprocessor.

[FVBCs]
  # Inlet
  [inlet_u]
    type = WCNSFVInletVelocityBC
    variable = u
    boundary = 'left'
    mdot_pp = 'inlet_mdot'
    area_pp = 'surface_inlet'
    rho = 'rho'
  []
  [inlet_v]
    type = WCNSFVInletVelocityBC
    variable = v
    boundary = 'left'
    mdot_pp = 0
    area_pp = 'surface_inlet'
    rho = 'rho'
  []
  [inlet_T]
    type = WCNSFVInletTemperatureBC
    variable = T
    boundary = 'left'
    temperature_pp = 'inlet_T'
  []

  [outlet_p]
    type = INSFVOutletPressureBC
    variable = pressure
    boundary = 'right'
    function = ${outlet_pressure}
  []

  # Walls
  [no_slip_x]
    type = INSFVNoSlipWallBC
    variable = u
    boundary = 'top bottom'
    function = 0
  []
  [no_slip_y]
    type = INSFVNoSlipWallBC
    variable = v
    boundary = 'top bottom'
    function = 0
  []
[]
(moose/modules/navier_stokes/test/tests/finite_volume/wcns/boundary_conditions/dirichlet_bcs_mdot.i)

Input Parameters

  • boundaryThe list of boundary IDs from the mesh where this object applies

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

    Controllable:No

    Description:The list of boundary IDs from the mesh where this object applies

  • variableThe name of the variable that this boundary condition applies to

    C++ Type:NonlinearVariableName

    Controllable:No

    Description:The name of the variable that this boundary condition applies to

Required Parameters

  • area_ppInlet area as a postprocessor

    C++ Type:PostprocessorName

    Controllable:No

    Description:Inlet area as a postprocessor

  • displacementsThe displacements

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

    Controllable:No

    Description:The displacements

  • mdot_ppPostprocessor with the inlet mass flow rate

    C++ Type:PostprocessorName

    Controllable:No

    Description:Postprocessor with the inlet mass flow rate

  • rhoDensity functor

    C++ Type:MooseFunctorName

    Controllable:No

    Description:Density functor

  • scaling_factor1To scale the velocity

    Default:1

    C++ Type:double

    Controllable:No

    Description:To scale the velocity

  • velocity_ppPostprocessor with the inlet velocity

    C++ Type:PostprocessorName

    Controllable:No

    Description:Postprocessor with the inlet velocity

Optional Parameters

  • absolute_value_vector_tagsThe tags for the vectors this residual object should fill with the absolute value of the residual contribution

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

    Controllable:No

    Description:The tags for the vectors this residual object should fill with the absolute value of the residual contribution

  • extra_matrix_tagsThe extra tags for the matrices this Kernel should fill

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

    Controllable:No

    Description:The extra tags for the matrices this Kernel should fill

  • extra_vector_tagsThe extra tags for the vectors this Kernel should fill

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

    Controllable:No

    Description:The extra tags for the vectors this Kernel should fill

  • matrix_tagssystemThe tag for the matrices this Kernel should fill

    Default:system

    C++ Type:MultiMooseEnum

    Options:nontime, system

    Controllable:No

    Description:The tag for the matrices this Kernel should fill

  • vector_tagsnontimeThe tag for the vectors this Kernel should fill

    Default:nontime

    C++ Type:MultiMooseEnum

    Options:nontime, time

    Controllable:No

    Description:The tag for the vectors this Kernel should fill

Tagging 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:Yes

    Description:Set the enabled status of the MooseObject.

  • implicitTrueDetermines whether this object is calculated using an implicit or explicit form

    Default:True

    C++ Type:bool

    Controllable:No

    Description:Determines whether this object is calculated using an implicit or explicit form

  • use_displaced_meshFalseWhether or not this object should use the displaced mesh for computation. Note that in the case this is true but no displacements are provided in the Mesh block the undisplaced mesh will still be used.

    Default:False

    C++ Type:bool

    Controllable:No

    Description:Whether or not this object should use the displaced mesh for computation. Note that in the case this is true but no displacements are provided in the Mesh block the undisplaced mesh will still be used.

Advanced Parameters