The Net Radiation Method System
The GrayDiffuseRadiation syntax invokes the RadiationTransferAction action. It simplifies setting up gray, diffuse radiative exchange problems. It requires the user to provide sideset IDs, emissivities on these sidesets, and the type of sideset.It allows to split the sidesets into radiation patches using the n_patches parameter. Refer to RadiationTransferAction for details.
Available Actions
- Heat Conduction App
- RadiationTransferActionThis action sets up the net radiation calculation between specified sidesets.
Example Input syntax
[Problem]
kernel_coverage_check = false
[]
[Mesh]
type = MeshGeneratorMesh
[./cmg]
type = CartesianMeshGenerator
dim = 2
dx = '1 1.3 1.9'
ix = '3 3 3'
dy = '2 1.2 0.9'
iy = '3 3 3'
subdomain_id = '0 1 0
4 5 2
0 3 0'
[../]
[./inner_bottom]
type = SideSetsBetweenSubdomainsGenerator
input = cmg
master_block = 1
paired_block = 5
new_boundary = 'inner_bottom'
[../]
[./inner_left]
type = SideSetsBetweenSubdomainsGenerator
input = inner_bottom
master_block = 4
paired_block = 5
new_boundary = 'inner_left'
[../]
[./inner_right]
type = SideSetsBetweenSubdomainsGenerator
input = inner_left
master_block = 2
paired_block = 5
new_boundary = 'inner_right'
[../]
[./inner_top]
type = SideSetsBetweenSubdomainsGenerator
input = inner_right
master_block = 3
paired_block = 5
new_boundary = 'inner_top'
[../]
[./rename]
type = RenameBlockGenerator
old_block_id = '1 2 3 4'
new_block_id = '0 0 0 0'
input = inner_top
[../]
[]
[Variables]
[./temperature]
block = 0
[../]
[]
[Kernels]
[./heat_conduction]
type = HeatConduction
variable = temperature
block = 0
diffusion_coefficient = 5
[../]
[]
[GrayDiffuseRadiation]
[./cavity]
sidesets = '4 5 6 7'
emissivity = '0.9 0.8 0.4 1'
n_patches = '2 2 2 3'
partitioners = 'centroid centroid centroid centroid'
centroid_partitioner_directions = 'x y y x'
final_mesh_generator = rename
temperature = temperature
adiabatic_sidesets = '7'
fixed_temperature_sidesets = '4'
fixed_boundary_temperatures = '1200'
[../]
[]
[BCs]
[./left]
type = DirichletBC
variable = temperature
boundary = left
value = 600
[../]
[./right]
type = DirichletBC
variable = temperature
boundary = right
value = 300
[../]
[]
[Postprocessors]
[./average_T_inner_right]
type = SideAverageValue
variable = temperature
boundary = inner_right
[../]
[]
[Executioner]
type = Steady
[]
[Outputs]
exodus = true
[]