flow123d_version: 4.0.0a01
problem: !Coupling_Sequential
  description: Test1 - Steady flow with multidimensional connections 1D-2D-3D
  mesh:
    mesh_file: ../00_mesh/cube_1x1x1_frac21.msh
    regions:
      - !Union
        name: fractures
        regions:
          - 2d_fracture_1
          - 2d_fracture_2
      - !Union
        name: dirichlet_boundary
        regions:
          - .1d_channel
          - .2d_fracture_1
          - .2d_fracture_2
          - .3d_cube
  flow_equation: !Flow_Darcy_LMH
    output_specific:
      raw_flow_output: ./raw_output.txt
    nonlinear_solver:
      linear_solver: !Petsc
        r_tol: 1.0e-10
        a_tol: 1.0e-10
    input_fields:
      - region: 1d_channel
        anisotropy: 10
        sigma: 0.05
      # using region set
      - region: 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
      - region: dirichlet_boundary
        bc_type: dirichlet
        bc_pressure: !FieldFormula
          value: X[0]-X[2]
    output:
      fields:
        - piezo_head_p0
        - pressure_p0
        - velocity_p0
    output_stream:
      file: ./flow.msh
      format: !gmsh
