Transferring Field Between FEM and FVM in MOOSE MultiApp Structure

[mahdipasaie]

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I’m working on a multi-physics example in MOOSE, where I’m using the Finite Element Method (FEM) to solve the heat equation and the Finite Volume Method (FVM) to solve fluid flow.

So far, I’ve successfully set up and solved:

• Lid-driven cavity problem (in fluid_flow.i using FVM) for fluid flow.
• Heat conduction between a hot left wall and a cold right wall (in heat_conduction.i using FEM).

I was able to transfer the velocity field from the FVM sub-app back to the FEM parent app using MOOSE’s transfer system. This allowed me to compute the advection term in the heat equation accurately.

Now, I’m trying to transfer the temperature field T from the FEM parent app to an auxiliary field in the FVM sub-app, but I encounter an error.

Error Message:

Cannot find variable Tf for Ttrans Transfer

where in the heat_conduction.i I have:

  [./Ttrans]
    type = MultiAppGeometricInterpolationTransfer
    to_multi_app = fluid
    source_variable = T
    variable = Tf 
  [../]

and in the fluid_flow.i (FVM ) file I have :

[AuxVariables]
 [Tf]
   # type = MooseVariableFVReal
 []
[]

To provide more context, here’s the GitHub repository with my setup:

https://github.com/mahdipasaie/moose_coupled_heat_fluid.git.

Any insights on the requirements or additional configurations for transferring fields between FEM and FVM apps in MOOSE would be greatly appreciated!

[mahdipasaie]

I had a syntax issue! I fixed that and now is working.