problem: !SequentialCoupling
  description: Test8 - Steady flow with sources
  mesh:
    mesh_file: ${INPUT}/test08.msh
  primary_equation: !Unsteady_LMH
    output_specific:
    solver: !Petsc
      r_tol: 1.0e-10
      a_tol: 1.0e-10
    input_fields:
      - r_set: .plane_boundary
        bc_type:  # :dirichlet  # Select either 'robin' or 'neumann' according to the value of 'bc_flux', 'bc_pressure', 'bc_sigma'.
        bc_pressure: 0
    balance: true
    output:
      output_stream:
        file: ./flow.pvd
        format: !vtk
          variant: ascii
        name: flow_output_stream
      output_fields:
        - pressure_p0
        - pressure_p1
        - velocity_p0
