Voronoi tessellation

[sidharthsarmah]

Hi @GiudGiud ,

I want to create a voronoi tessellation of a steel sample and perform diffusion modelling. It has different types of grains and grain boundaries, I dont find lot of text related to VT in MOOSE, can you please suggest.

[GiudGiud]

Hello

There are plenty of options. See the PropertyReadFile to be able to load data using a voronoi distribution. Then once this data is in a FUnction you can use it to assign subdomains, (through FunctionAux + CoupledVarSubdomainModifier), to assign material properties (using the same PropertyReadFile) etc

[sidharthsarmah]

Thanks @GiudGiud

[sidharthsarmah]

Hi @GiudGiud , I am using both triangular and quadratic elements in MOOSE using TRI3 and QUAD4, but does MOOSE not support using both together?

Error: Exodus requires all elements with a given subdomain ID to be the same type.
Can't write both QUAD4 and TRI3 in the same block!

[GiudGiud]

they just need to be in different subdomains. The MeshRepairGenerator will separate them for you

[sidharthsarmah]

hi @GiudGiud , I could not file the source files, please suggest:

[Mesh]
  
  [./mesh]
    type = FileMeshGenerator
    file = PBf.inp
  [../]

  [./combine]
    type = MeshRepairGenerator
    input = 'mesh'
    separate_blocks_by_element_types = true
  [../]
  
[]

*** ERROR ***
A 'MeshRepairGenerator' is not a registered object.

If you are trying to find this object in a dynamically linked library, make sure that
the library can be found either in your "Problem/library_path" parameter or in the
MOOSE_LIBRARY_PATH environment variable.

[GiudGiud]

you are using an old version of moose, it exists:

https://mooseframework.inl.gov/source/meshgenerators/MeshRepairGenerator.html

[sidharthsarmah]

Hi @GiudGiud , should I just update using this?

conda activate moose
conda update --all

cd ~/projects/moose
git fetch origin
git rebase origin/master

[GiudGiud]

Depends on the kernels as well.
You can check the conservation / balance of flux & sources to be sure.

[sidharthsarmah]

Thanks, can you please tell me how do I do it?

[GiudGiud]

you add postprocessing for computing the sources, sinks and fluxes on each surface.
You have one such postprocessor in your first snippet

[sidharthsarmah]

Hi @GiudGiud
I want to have a different value of CL in the grain boundary, say Sgb*CL, how to define it in the block (say DL is Dgb in grain boundary):

[Variables]
  [./cL]
    initial_condition = 0.0
  [../]
[]

[Kernels]
  [./cL]
    type = ADMatDiffusion
    variable = 'cL'
    diffusivity = 'DL' 
   block = 0
  [../]

  [./cgb]
    type = ADMatDiffusion
    variable = 'Sgb*cL'
    diffusivity = 'DL' 
   block = 1
  [../]
[]

[Materials]

  [./D_GB]
    type = ADGenericConstantMaterial
    block = 0
    prop_names = 'DL' #DGB
    prop_values = '4987.5e-2'
    outputs = 'exodus'
  [../]

  [./D_matrix]
    type = ADGenericConstantMaterial
    block = 1
    prop_names = 'DL'
    prop_values = '4987.5e-6'
    outputs = 'exodus'
  [../]
[]

[GiudGiud]

in the grain boundary, say Sgb*CL,

what is a grain boundary in your simulation / mesh? It is a different block? Is it a sideset?