FVFunctorConvectiveHeatFluxBC

Convective heat transfer boundary condition with temperature and heat transfer coefficient given by functors.

Description

This boundary condition computes convective heat flux , where is the convective heat transfer coefficient, is the temperature, and is the far-field temperature. Both and are functors, which enables various spatial, variable and other dependences. The domain of the variable can be specified as either a fluid or a solid using the is_solid parameter. For a solid domain, the equation above is applied. For a fluid domain, the negative of the heat flux is applied. This allows for easier implementation of a double Robin boundary condition.

Similar objects: - CoupledConvectiveHeatFluxBC for a similar boundary condition coupled to variables, for finite elements - FunctorThermalResistanceBC for a combined conduction, convection, and radiative boundary condition, with a constant outside ambient temperature

Example syntax

In this example, the FVFunctorConvectiveHeatFluxBC boundary condition forms a convective boundary condition between the fluid and the solid.

[Mesh<<<{"href": "../../syntax/Mesh/index.html"}>>>]
  [gen]
    type = GeneratedMeshGenerator<<<{"description": "Create a line, square, or cube mesh with uniformly spaced or biased elements.", "href": "../meshgenerators/GeneratedMeshGenerator.html"}>>>
    dim<<<{"description": "The dimension of the mesh to be generated"}>>> = 2
    nx<<<{"description": "Number of elements in the X direction"}>>> = 6
    ny<<<{"description": "Number of elements in the Y direction"}>>> = 5
    xmax<<<{"description": "Upper X Coordinate of the generated mesh"}>>> = 2
    subdomain_ids<<<{"description": "Subdomain IDs for each element, default to all zero. If a single number is specified, that subdomain id is used for all element."}>>> = '0 0 0 1 1 1
                     0 0 0 1 1 1
                     0 0 0 1 1 1
                     0 0 0 1 1 1
                     0 0 0 1 1 1'
  []
  [interface]
    type = SideSetsBetweenSubdomainsGenerator<<<{"description": "MeshGenerator that creates a sideset composed of the nodes located between two or more subdomains.", "href": "../meshgenerators/SideSetsBetweenSubdomainsGenerator.html"}>>>
    input<<<{"description": "The mesh we want to modify"}>>> = gen
    primary_block<<<{"description": "The primary set of blocks for which to draw a sideset between"}>>> = 0
    paired_block<<<{"description": "The paired set of blocks for which to draw a sideset between"}>>> = 1
    new_boundary<<<{"description": "The list of boundary names to create on the supplied subdomain"}>>> = interface
  []
[]

[FVBCs<<<{"href": "../../syntax/FVBCs/index.html"}>>>]
  [interface_fluid_to_solid]
    type = FVFunctorConvectiveHeatFluxBC<<<{"description": "Convective heat transfer boundary condition with temperature and heat transfer coefficient given by functors.", "href": "FVFunctorConvectiveHeatFluxBC.html"}>>>
    boundary<<<{"description": "The list of boundary IDs from the mesh where this object applies"}>>> = 'interface'
    variable<<<{"description": "The name of the variable that this boundary condition applies to"}>>> = T_solid
    T_bulk<<<{"description": "Functor for far-field temperature. A functor is any of the following: a variable, a functor material property, a function, a post-processor, or a number."}>>> = T_fluid
    T_solid<<<{"description": "Functor for wall temperature. A functor is any of the following: a variable, a functor material property, a function, a post-processor, or a number."}>>> = T_solid
    is_solid<<<{"description": "Whether this kernel acts on the solid temperature"}>>> = true
    heat_transfer_coefficient<<<{"description": "Functor for heat transfer coefficient. A functor is any of the following: a variable, a functor material property, a function, a post-processor, or a number."}>>> = 'htc'
  []
  [left]
    type = FVDirichletBC<<<{"description": "Defines a Dirichlet boundary condition for finite volume method.", "href": "FVDirichletBC.html"}>>>
    boundary<<<{"description": "The list of boundary IDs from the mesh where this object applies"}>>> = 'left'
    variable<<<{"description": "The name of the variable that this boundary condition applies to"}>>> = T_solid
    value<<<{"description": "value to enforce at the boundary face"}>>> = 1
  []

  [interface_solid_to_fluid]
    type = FVFunctorConvectiveHeatFluxBC<<<{"description": "Convective heat transfer boundary condition with temperature and heat transfer coefficient given by functors.", "href": "FVFunctorConvectiveHeatFluxBC.html"}>>>
    boundary<<<{"description": "The list of boundary IDs from the mesh where this object applies"}>>> = 'interface'
    variable<<<{"description": "The name of the variable that this boundary condition applies to"}>>> = T_fluid
    T_bulk<<<{"description": "Functor for far-field temperature. A functor is any of the following: a variable, a functor material property, a function, a post-processor, or a number."}>>> = T_fluid
    T_solid<<<{"description": "Functor for wall temperature. A functor is any of the following: a variable, a functor material property, a function, a post-processor, or a number."}>>> = T_solid
    is_solid<<<{"description": "Whether this kernel acts on the solid temperature"}>>> = false
    heat_transfer_coefficient<<<{"description": "Functor for heat transfer coefficient. A functor is any of the following: a variable, a functor material property, a function, a post-processor, or a number."}>>> = 'htc'
  []
  [right]
    type = FVDirichletBC<<<{"description": "Defines a Dirichlet boundary condition for finite volume method.", "href": "FVDirichletBC.html"}>>>
    boundary<<<{"description": "The list of boundary IDs from the mesh where this object applies"}>>> = 'right'
    variable<<<{"description": "The name of the variable that this boundary condition applies to"}>>> = T_fluid
    value<<<{"description": "value to enforce at the boundary face"}>>> = 0
  []
[]