CFEM Diffusion Test-cases as Tutorials

The following CFEM diffusion test-cases are built on the same 2D square geometry:

1. CFEM_Diffusion_2D_1a_linear
   • description: pure scatterer, no volumetric source, boundary source, solution is linear
   • feature of potential interest:
     • material properties a Lua functions of position and material ID,
     • use of chiLogicalVolume to define boundaries,
     • field function and export of FF line to python.
2. CFEM_Diffusion_2D_2a_DirichletBCs
   • description: diffusion-reaction on a 2-region domain, with Dirichlet BCs
   • feature of potential interest:
     • use of chiLogicalVolume to define material regions,
     • material properties a Lua functions of position and material ID.
3. CFEM_Diffusion_2D_3b_analytical_coef2
   • description: diffusion-reaction problem with space-dependent material properties
   • feature of potential interest:
     • use of chiLogicalVolume to define material regions,
     • material properties a Lua functions of position and material ID.