LinearFVRobinCHTBC

Description

This object is a boundary condition used in the Navier-Stokes module that can be used for conjugate heat transfer (CHT) problems. Its role is to enforce a Robin-type boundary condition at an interface where heat is exchanged between solid and fluid regions. It is similar in behavior to LinearFVAdvectionDiffusionFunctorRobinBC with the coefficients in the expression aligned with the thermal-hydraulics fields. For more information on the design of CHT, see the CHT capability page.

This boundary condition needs an incoming flux which is typically provided by the SIMPLE-type executioner when conjugate heat transfer is enabled. The automatically created functors within SIMPLE are:

  • heat_flux_to_solid_* (where * is the interface boundary name)

  • heat_flux_to_fluid_* (where * is the interface boundary name)

When this boundary condition is action on the fluid side the user is recommended to set "incoming_flux" parameter to the heat_flux_to_fluid functor. The same logic applies to the solid side. Furthermore, this boundary condition also requires a surface temperature which is typically the surface temperature on the other side of the interface. The interface temperatures are also tracked in fuctors and are created within the SIMPLE executioner. The following surface termperatures are created automatically:

  • interface_temperature_solid_* (where * is the interface boundary name)

  • interface_temperature_fluid_* (where * is the interface boundary name)

The element side to use for the incoming-flux and surface-temperature functor is inferred.

[LinearFVBCs<<<{"href": "../../syntax/LinearFVBCs/index.html"}>>>]
  [fluid_solid]
    type = LinearFVRobinCHTBC<<<{"description": "Conjugate heat transfer BC for Robin boundary condition-based coupling.", "href": "LinearFVRobinCHTBC.html"}>>>
    variable<<<{"description": "The name of the variable that this boundary condition applies to"}>>> = T_fluid
    boundary<<<{"description": "The list of boundary IDs from the mesh where this object applies"}>>> = interface
    h<<<{"description": "The convective heat transfer coefficient. A functor is any of the following: a variable, a functor material property, a function, a postprocessor or a number."}>>> = ${h_f}
    incoming_flux<<<{"description": "The incoming diffusive flux on the interface. A functor is any of the following: a variable, a functor material property, a function, a postprocessor or a number."}>>> = heat_flux_to_fluid_interface
    surface_temperature<<<{"description": "The prescribed temperature on the interface. A functor is any of the following: a variable, a functor material property, a function, a postprocessor or a number."}>>> = interface_temperature_to_fluid_interface
    thermal_conductivity<<<{"description": "The thermal conductivity of the material. Only used to compute the pure normal gradient of the variable on the boundary. A functor is any of the following: a variable, a functor material property, a function, a postprocessor or a number."}>>> = ${k}
  []

  [solid_fluid]
    type = LinearFVRobinCHTBC<<<{"description": "Conjugate heat transfer BC for Robin boundary condition-based coupling.", "href": "LinearFVRobinCHTBC.html"}>>>
    variable<<<{"description": "The name of the variable that this boundary condition applies to"}>>> = T_solid
    boundary<<<{"description": "The list of boundary IDs from the mesh where this object applies"}>>> = interface
    h<<<{"description": "The convective heat transfer coefficient. A functor is any of the following: a variable, a functor material property, a function, a postprocessor or a number."}>>> = ${h_s}
    incoming_flux<<<{"description": "The incoming diffusive flux on the interface. A functor is any of the following: a variable, a functor material property, a function, a postprocessor or a number."}>>> = heat_flux_to_solid_interface
    surface_temperature<<<{"description": "The prescribed temperature on the interface. A functor is any of the following: a variable, a functor material property, a function, a postprocessor or a number."}>>> = interface_temperature_to_solid_interface
    thermal_conductivity<<<{"description": "The thermal conductivity of the material. Only used to compute the pure normal gradient of the variable on the boundary. A functor is any of the following: a variable, a functor material property, a function, a postprocessor or a number."}>>> = ${k_s}
  []
[]
(modules/navier_stokes/test/tests/finite_volume/ins/cht/conjugate_heat_transfer/cht_rob-rob.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

  • hThe convective heat transfer coefficient. A functor is any of the following: a variable, a functor material property, a function, a postprocessor or a number.

    C++ Type:MooseFunctorName

    Unit:(no unit assumed)

    Controllable:No

    Description:The convective heat transfer coefficient. A functor is any of the following: a variable, a functor material property, a function, a postprocessor or a number.

  • incoming_fluxThe incoming diffusive flux on the interface. A functor is any of the following: a variable, a functor material property, a function, a postprocessor or a number.

    C++ Type:MooseFunctorName

    Unit:(no unit assumed)

    Controllable:No

    Description:The incoming diffusive flux on the interface. A functor is any of the following: a variable, a functor material property, a function, a postprocessor or a number.

  • surface_temperatureThe prescribed temperature on the interface. A functor is any of the following: a variable, a functor material property, a function, a postprocessor or a number.

    C++ Type:MooseFunctorName

    Unit:(no unit assumed)

    Controllable:No

    Description:The prescribed temperature on the interface. A functor is any of the following: a variable, a functor material property, a function, a postprocessor or a number.

  • thermal_conductivityThe thermal conductivity of the material. Only used to compute the pure normal gradient of the variable on the boundary. A functor is any of the following: a variable, a functor material property, a function, a postprocessor or a number.

    C++ Type:MooseFunctorName

    Unit:(no unit assumed)

    Controllable:No

    Description:The thermal conductivity of the material. Only used to compute the pure normal gradient of the variable on the boundary. A functor is any of the following: a variable, a functor material property, a function, a postprocessor or a number.

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

    C++ Type:LinearVariableName

    Unit:(no unit assumed)

    Controllable:No

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

Required 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_onlyFalseWhether this object is only doing assembly to matrices (no vectors)

    Default:False

    C++ Type:bool

    Controllable:No

    Description:Whether this object is only doing assembly to matrices (no vectors)

  • 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_tagsrhsThe tag for the vectors this Kernel should fill

    Default:rhs

    C++ Type:MultiMooseEnum

    Options:rhs, time

    Controllable:No

    Description:The tag for the vectors this Kernel should fill

Contribution To Tagged Field Data 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

  • search_methodnearest_node_connected_sidesChoice of search algorithm. All options begin by finding the nearest node in the primary boundary to a query point in the secondary boundary. In the default nearest_node_connected_sides algorithm, primary boundary elements are searched iff that nearest node is one of their nodes. This is fast to determine via a pregenerated node-to-elem map and is robust on conforming meshes. In the optional all_proximate_sides algorithm, primary boundary elements are searched iff they touch that nearest node, even if they are not topologically connected to it. This is more CPU-intensive but is necessary for robustness on any boundary surfaces which has disconnections (such as Flex IGA meshes) or non-conformity (such as hanging nodes in adaptively h-refined meshes).

    Default:nearest_node_connected_sides

    C++ Type:MooseEnum

    Options:nearest_node_connected_sides, all_proximate_sides

    Controllable:No

    Description:Choice of search algorithm. All options begin by finding the nearest node in the primary boundary to a query point in the secondary boundary. In the default nearest_node_connected_sides algorithm, primary boundary elements are searched iff that nearest node is one of their nodes. This is fast to determine via a pregenerated node-to-elem map and is robust on conforming meshes. In the optional all_proximate_sides algorithm, primary boundary elements are searched iff they touch that nearest node, even if they are not topologically connected to it. This is more CPU-intensive but is necessary for robustness on any boundary surfaces which has disconnections (such as Flex IGA meshes) or non-conformity (such as hanging nodes in adaptively h-refined meshes).

Advanced Parameters

Input Files