problem: !SequentialCoupling
  description: Test6 - Coupling between dimension 2D-3D - influence of sigma and cross
    section parameters.
  mesh:
    mesh_file: ${INPUT}/test6_32d.msh
  primary_equation: !Steady_MH
    n_schurs: 2
    input_fields:
      - region: 2d_fraction
        conductivity: 16
        # K_2d
        sigma: 0.3125
        # sigma
        cross_section: 10
        # delta_2d
        # f_2d
        water_source_density: !FieldFormula
          value: -2/10
          # f_2d:- q / delta_2d
      - region: 3d_cube
        conductivity: 2
        # K_3d
      - region: .2d_fraction
        bc_type: neumann
        bc_flux: !FieldFormula
          value: '0'
      - region: .3d_cube
        bc_type: dirichlet
        bc_piezo_head: !FieldFormula
          value: z
          # p_3d
    output:
      output_stream:
        file: test6_32d.pvd
        format: !vtk
          variant: ascii
        name: flow_output_stream
      output_fields:
        - piezo_head_p0
        - pressure_p0
        - pressure_p1
        - velocity_p0
    balance: true
    solver: !Petsc
      a_tol: 1.0e-07