sn-induction_3D

sn-induction_3D

3D simulation of CsI Czochralski growth with induction heating using a coupling between a global Elmer model and a melt flow OpenFOAM model.

Overview

An overview of the simulation setup can be found here. The following result was obtained using a graphite crucible:

Configuration, setup, and execution

This model is based on the 2D model provided here.

• The configuration of the simulation is stored in the yaml-files:
  • Geometry parameters are defined in config_geo.yml and setup_run_elmer.py. Note, that some parameters of the meshing are directly set in setup_run_elmer.py and setup_openfoam.py.
  • The global Elmer simulation is configured in config_sim.yml.
  • The material properties used in the global Elmer simulation are configured in config_mat.yml.
• The mesh of the global model is set up in setup_run_elmer.py, which contains also the setup of the global simulation.
• The mesh of the flow model is set up in setup_openfoam.py.
• The flow model is configured in the corresponding templates in openfoam_template_steady_3D or openfoam_template_transient_3D. The most important settings can be found in constant/transportProperties (material parameters), system/controlDict (simulation time, output), system/changeDictionaryDict (coupling with heat fluxes or fixed temperatures) and 0.orig/U (crystal rotation).
• The flow model is set up using setup_openfoam_3D.py with the path to the results of the global model defined in the script.
• The simulation is executed in the following way:
  • The global model is executed with Python using setup_run_elmer.py.
  • The flow model is executed using the Allrun script.
• Feedback from the flow model to the global model is possible, but not implemented in an automatized way. Manual coupling by modifying the Elmer sif-file was performed in the reference.

It should be noted that mesh generation for the global 3D model requires a significant amount of memory and was performed on a simulation cluster for the example shown above.

Additional details

For a more detailed description including simulation results see:

A. Wintzer, Validation of multiphysical models for Czochralski crystal growth. PhD thesis, Technische Universität Berlin, Berlin, 2024.