INSFVMixingLengthScalarDiffusion

This kernel uses a mixing-length model to compute the turbulent diffusion of a passive scalar, $\nabla \cdot \overline{ c' \vec u'}$ , which appears in Reynolds-averaged conservation equations.

Example passive scalars include energy and trace chemicals. In the case of energy, the turbulent Schmidt number parameter is actually referred to as the turbulent Prandtl number.

Input Parameters

mixing_lengthThe turbulent mixing length.
C++ Type:std::vector<VariableName>
Controllable:No
Description:The turbulent mixing length.
schmidt_numberThe turbulent Schmidt number (or turbulent Prandtl number if the passive scalar is energy) that relates the turbulent scalar diffusivity to the turbulent momentum diffusivity.
C++ Type:double
Controllable:No
Description:The turbulent Schmidt number (or turbulent Prandtl number if the passive scalar is energy) that relates the turbulent scalar diffusivity to the turbulent momentum diffusivity.
uThe velocity in the x direction.
C++ Type:std::vector<VariableName>
Controllable:No
Description:The velocity in the x direction.
variableThe name of the finite volume variable this kernel applies to
C++ Type:NonlinearVariableName
Controllable:No
Description:The name of the finite volume variable this kernel applies to

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
boundaries_to_forceThe set of boundaries to force execution of this FVFluxKernel on.
C++ Type:std::vector<BoundaryName>
Controllable:No
Description:The set of boundaries to force execution of this FVFluxKernel on.
boundaries_to_not_forceThe set of boundaries to not force execution of this FVFluxKernel on.
C++ Type:std::vector<BoundaryName>
Controllable:No
Description:The set of boundaries to not force execution of this FVFluxKernel on.
force_boundary_executionFalseWhether to force execution of this object on the boundary.
Default:False
C++ Type:bool
Controllable:No
Description:Whether to force execution of this object on the boundary.
ghost_layers2The number of layers of elements to ghost.
Default:2
C++ Type:unsigned short
Controllable:No
Description:The number of layers of elements to ghost.
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.
use_point_neighborsFalseWhether to use point neighbors, which introduces additional ghosting to that used for simple face neighbors.
Default:False
C++ Type:bool
Controllable:No
Description:Whether to use point neighbors, which introduces additional ghosting to that used for simple face neighbors.
vThe velocity in the y direction.
C++ Type:std::vector<VariableName>
Controllable:No
Description:The velocity in the y direction.
wThe velocity in the z direction.
C++ Type:std::vector<VariableName>
Controllable:No
Description:The velocity in the z direction.

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: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

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

Input Files

(modules/navier_stokes/test/tests/finite_volume/ins/channel-flow/2d-mixing-length.i)

(modules/navier_stokes/test/tests/finite_volume/ins/channel-flow/2d-mixing-length.i)

Re = 1e4
von_karman_const = 0.2

D = 1
rho = 1
bulk_u = 1
mu = ${fparse rho * bulk_u * D / Re}

advected_interp_method='upwind'
velocity_interp_method='rc'

[GlobalParams]
  rhie_chow_user_object = 'rc'
[]

[UserObjects]
  [rc]
    type = INSFVRhieChowInterpolator
    u = vel_x
    v = vel_y
    pressure = pressure
  []
[]

[Mesh]
  [gen]
    type = GeneratedMeshGenerator
    dim = 2
    xmin = 0
    xmax = 5
    ymin = 0
    ymax = ${fparse 0.5 * D}
    nx = 20
    ny = 10
    bias_y = ${fparse 1 / 1.2}
  []
[]

[Problem]
  fv_bcs_integrity_check = true
[]

[Variables]
  [vel_x]
    type = INSFVVelocityVariable
    initial_condition = 1
  []
  [vel_y]
    type = INSFVVelocityVariable
    initial_condition = 1
  []
  [pressure]
    type = INSFVPressureVariable
  []
  [scalar]
    type = INSFVScalarFieldVariable
  []
[]

[AuxVariables]
  [mixing_length]
    order = CONSTANT
    family = MONOMIAL
    fv = true
  []
[]

[FVKernels]
  [mass]
    type = INSFVMassAdvection
    variable = pressure
    advected_interp_method = ${advected_interp_method}
    velocity_interp_method = ${velocity_interp_method}
    rho = ${rho}
  []

  [u_advection]
    type = INSFVMomentumAdvection
    variable = vel_x
    advected_interp_method = ${advected_interp_method}
    velocity_interp_method = ${velocity_interp_method}
    rho = ${rho}
    momentum_component = 'x'
  []
  [u_viscosity]
    type = INSFVMomentumDiffusion
    variable = vel_x
    mu = ${mu}
    momentum_component = 'x'
  []
  [u_viscosity_rans]
    type = INSFVMixingLengthReynoldsStress
    variable = vel_x
    rho = ${rho}
    mixing_length = 'mixing_length'
    momentum_component = 'x'
    u = vel_x
    v = vel_y
  []
  [u_pressure]
    type = INSFVMomentumPressure
    variable = vel_x
    momentum_component = 'x'
    pressure = pressure
  []

  [v_advection]
    type = INSFVMomentumAdvection
    variable = vel_y
    advected_interp_method = ${advected_interp_method}
    velocity_interp_method = ${velocity_interp_method}
    rho = ${rho}
    momentum_component = 'y'
  []
  [v_viscosity]
    type = INSFVMomentumDiffusion
    variable = vel_y
    mu = ${mu}
    momentum_component = 'y'
  []
  [v_viscosity_rans]
    type = INSFVMixingLengthReynoldsStress
    variable = vel_y
    rho = ${rho}
    mixing_length = 'mixing_length'
    momentum_component = 'y'
    u = vel_x
    v = vel_y
  []
  [v_pressure]
    type = INSFVMomentumPressure
    variable = vel_y
    momentum_component = 'y'
    pressure = pressure
  []

  [scalar_advection]
    type = INSFVScalarFieldAdvection
    variable = scalar
    velocity_interp_method = ${velocity_interp_method}
    advected_interp_method = ${advected_interp_method}
  []
  [scalar_diffusion_rans]
    type = INSFVMixingLengthScalarDiffusion
    variable = scalar
    mixing_length = 'mixing_length'
    u = vel_x
    v = vel_y
    schmidt_number = 1.0
  []
  [scalar_src]
    type = FVBodyForce
    variable = scalar
    value = 0.1
  []
[]

[AuxKernels]
  [mixing_len]
    type = WallDistanceMixingLengthAux
    walls = 'top bottom'
    variable = 'mixing_length'
    execute_on = 'initial'
    von_karman_const = ${von_karman_const}
  []
[]

[FVBCs]
  [inlet-u]
    type = INSFVInletVelocityBC
    boundary = 'left'
    variable = vel_x
    function = '1'
  []
  [inlet-v]
    type = INSFVInletVelocityBC
    boundary = 'left'
    variable = vel_y
    function = '0'
  []
  [inlet_scalar]
    type = FVDirichletBC
    boundary = 'left'
    variable = scalar
    value = 1
  []
  [wall-u]
    type = INSFVNoSlipWallBC
    boundary = 'top'
    variable = vel_x
    function = 0
  []
  [wall-v]
    type = INSFVNoSlipWallBC
    boundary = 'top'
    variable = vel_y
    function = 0
  []
  [sym-u]
    type = INSFVSymmetryVelocityBC
    boundary = 'bottom'
    variable = vel_x
    u = vel_x
    v = vel_y
    mu = 'total_viscosity'
    momentum_component = x
  []
  [sym-v]
    type = INSFVSymmetryVelocityBC
    boundary = 'bottom'
    variable = vel_y
    u = vel_x
    v = vel_y
    mu = 'total_viscosity'
    momentum_component = y
  []
  [outlet_p]
    type = INSFVOutletPressureBC
    boundary = 'right'
    variable = pressure
    function = '0'
  []
[]

[Materials]
  [total_viscosity]
    type = MixingLengthTurbulentViscosityMaterial
    u = 'vel_x'                             #computes total viscosity = mu_t + mu
    v = 'vel_y'                             #property is called total_viscosity
    mixing_length = 'mixing_length'
    mu = ${mu}
    rho = ${rho}
  []
[]

[Executioner]
  type = Steady
  solve_type = 'NEWTON'
  petsc_options_iname = '-pc_type -ksp_gmres_restart -sub_pc_type -sub_pc_factor_shift_type'
  petsc_options_value = 'asm      200                lu           NONZERO'
  line_search = 'none'
  nl_rel_tol = 1e-12
[]

[Outputs]
  exodus = true
[]Copy

Input Parameters
Input Files

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