Multiple Cubes with Mesh Generation

[AryGP]

Hello,
I am trying to simulate the thermal expansion of two copper wafers using MOOSE and visualizing on Paraview. I am struggling to create 2 objects in moose. I am using the solid_mechanics/thermal_expansion/constant_expansion_stress_free_temp.i
This is what I have, I just want to make 2 cubes and see both of them expand and come in contact.

[Mesh]
  type = GeneratedMesh
  dim = 3
  nx = 2
  ny = 2
  nz = 2
[]

[GlobalParams]
  displacements = 'disp_x disp_y disp_z'
[]

[AuxVariables]
  [./temp]
  [../]
[]

[Functions]
  [./temperature_load]
    type = ParsedFunction
    expression = t*(500.0)+300.0
  [../]
[]

[Physics]
  [SolidMechanics]
    [QuasiStatic]
      [./all]
        strain = SMALL
        incremental = true
        add_variables = true
        eigenstrain_names = eigenstrain
        generate_output = 'strain_xx strain_yy strain_zz'
      [../]
    [../]
  [../]
[]

[AuxKernels]
  [./tempfuncaux]
    type = FunctionAux
    variable = temp
    function = temperature_load
  [../]
[]

[BCs]
  [./x_bot]
    type = DirichletBC
    variable = disp_x
    boundary = left
    value = 0.0
  [../]
  [./y_bot]
    type = DirichletBC
    variable = disp_y
    boundary = bottom
    value = 0.0
  [../]
  [./z_bot]
    type = DirichletBC
    variable = disp_z
    boundary = back
    value = 0.0
  [../]
[]

[Materials]
  [./elasticity_tensor]
    type = ComputeIsotropicElasticityTensor
    youngs_modulus = 2.1e5
    poissons_ratio = 0.3
  [../]
  [./small_stress]
    type = ComputeFiniteStrainElasticStress
  [../]
  [./thermal_expansion_strain]
    type = ComputeThermalExpansionEigenstrain
    stress_free_temperature = 298
    thermal_expansion_coeff = 1.3e-5
    temperature = temp
    eigenstrain_name = eigenstrain
  [../]
[]

[Executioner]
  type = Transient
  solve_type = 'PJFNK'

  l_max_its = 50
  nl_max_its = 50
  nl_rel_tol = 1e-12
  nl_abs_tol = 1e-10
  l_tol = 1e-9

  start_time = 0.0
  end_time = 0.075
  dt = 0.0125
  dtmin = 0.0001
[]

[Outputs]
  exodus = true
  checkpoint = true
[]

[Postprocessors]
  [./strain_xx]
    type = ElementAverageValue
    variable = strain_xx
  [../]
  [./strain_yy]
    type = ElementAverageValue
    variable = strain_yy
  [../]
  [./strain_zz]
    type = ElementAverageValue
    variable = strain_zz
  [../]
  [./temperature]
    type = AverageNodalVariableValue
    variable = temp
  [../]
[]

[GiudGiud]

Hello

Try this to make two cubes

[Mesh]
  [cube1]
    type = GeneratedMeshGenerator
    dim = 3
    nx = 2
    ny = 2
    nz = 2
    subdomain_name = 'cube1'
  []
  [cube2]
    type = GeneratedMeshGenerator
    dim = 3
    xmin = 1
    xmax = 2
    nx = 2
    ny = 2
    nz = 2
    subdomain_ids = '1'
    subdomain_name = 'cube2'
  []
  [stitch]
    type = StitchedMeshGenerator
    inputs = 'cube1 cube2'
    stitch_boundaries_pairs = 'right left'
[]
[]

The two meshes will have different subdomains so you can define different materials on them for example

[AryGP]

I tried this
[]
[cylinder]
type = GeneratedMeshGenerator
dim = 3
shape = 'cylinder'
radius = 1.0
height = 2.0
num_rings = 2
num_segments = 8
num_axial = 2
subdomain_name = 'cylinder'
[]

but it seems like none of these are able to be recognized in moose

[GiudGiud]

shape = 'cylinder'

this is not a parameter

[AryGP]

ok.
[Mesh]
[cube1]
type = GeneratedMeshGenerator
dim = 3
nx = 2
ny = 2
nz = 2
subdomain_name = 'cube1'
[]
[cylinder]
type = GeneratedMeshGenerator
dim = 3
radius = 1.0
height = 2.0
num_rings = 2
num_segments = 8
num_axial = 2
subdomain_name = 'cylinder'
[]
[stitch]
type = StitchedMeshGenerator
prevent_boundary_ids_overlap = False
inputs = 'cube1 cylinder'
stitch_boundaries_pairs = 'right left'
[]
[]

It's still saying I have unused parameters

[AryGP]

None of the examples MOOSE provides has a solid cylinder mesh

[GiudGiud]

use these two to build a cylinder from a circle
https://mooseframework.inl.gov/source/meshgenerators/ConcentricCircleMeshGenerator.html
https://mooseframework.inl.gov/source/meshgenerators/AdvancedExtruderGenerator.html

[AryGP]

I was able to create the Concentric circle but I can't get the extrude generator to work.
[Mesh]
[cube1]
type = GeneratedMeshGenerator
dim = 3
nx = 2
ny = 2
nz = 2
subdomain_name = 'cube1'
[]
[circle]
type = ConcentricCircleMeshGenerator
num_sectors = 6
radii = '0.2546 0.3368 0.3600 0.3818 0.3923 0.4025 0.4110 0.4750'
rings = '5 3 2 1 1 1 1 3 5'
has_outer_square = on
pitch = 1.42063
#portion = left_half
preserve_volumes = off
smoothing_max_it = 3
[]
[extrude]
type = AdvancedExtruderGenerator
input = cylinder
heights = '1 2 3'
num_layers = '1 2 3'
direction = '0 0 1'
bottom_sideset = '4'
top_sideset = '5'
subdomain_swaps = '0 1;
0 2;
0 3'
[]
[stitch]
type = StitchedMeshGenerator
prevent_boundary_ids_overlap = False
inputs = 'cube1 cylinder'
stitch_boundaries_pairs = 'right left'
[]
[]

*** ERROR ***
Your MeshGenerator tree contains multiple possible generator outputs :
"stitch and one or more of the following from an independent set: "extrude"

This may be due to a missing dependency or may be intentional. Please either

• check that all the mesh generators are connected as a tree and culminate in a single final mesh. Having one wrong 'input=mg' parameter is the most common error
• add additional dependencies to remove the ambiguity if you are using a user-built MeshGenerator
• if you intend to execute a subset of the defined generators (uncommon), select the final MeshGenerator in the [Mesh] block with the "final_generator" parameter.

[GiudGiud]

the error message explains what is happening.
you need every mesh generator to form a connected graph with a single output mesh (the tree)