problem: !SequentialCoupling
  description: Test1 - Steady flow with multidimensional connections 1D-2D-3D
  mesh:
    mesh_file: ./input/test1_new.msh
    sets:
      - name: fractures
        region_labels:
          - 2d_fracture_1
          - 2d_fracture_2
      - name: dirichlet_boundary
        region_labels:
          - .1d_channel
          - .2d_fracture_1
          - .2d_fracture_2
          - .3d_cube
  primary_equation: !Steady_MH
    n_schurs: 2
    input_fields:
      - region: 1d_channel
        anisotropy: 10
        sigma: 0.05
      # using region set
      - r_set: fractures
        anisotropy: 1
        sigma: 0.5
      #         { region:"2d_fracture_1",
      #           anisotropy:1,
      #           sigma:0.5
      #         },
      #         { region:"2d_fracture_2",
      #           anisotropy:1,
      #           sigma:0.5
      #         },
      - region: 3d_cube
        anisotropy: 0.1
      # using region set
      - r_set: dirichlet_boundary
        bc_type: dirichlet
        bc_pressure: !FieldFormula
          value: x-z
    balance: true
    output:
      output_stream: 
        file: ./test1.msh
        format: !gmsh
          variant: ascii
        name: flow_output_stream
      output_fields:
        - piezo_head_p0
        - pressure_p0
        - pressure_p1
        - velocity_p0
      raw_flow_output: ./raw_output.txt
    solver: !Petsc
      r_tol: 1.0e-10
      a_tol: 1.0e-10