SOLUTION
  transient
    # Run 50 time steps out to time 5.0e-3
    time_step 1.0e-4
    nsteps 50
    # Output every time step
    nskip 1
    # Numerical damping used in time integrator
    rho 0.9
    # Use lumped mass rather than consistent mass matrix
    lumped_consistent
END

FILE
   geometry_file 'acoustic_nodeset_distribution_factors.exo'
END

LOADS
  # Lighthill is an acoustic source term due to airflow
  nodeset 1
    Lighthill = 1.0
    function = 1
END

LINESAMPLE
  # Output data long the defined line
  samples per line 100
  endpoint 0. 0. 0. -1 0. 0.
  format exodus
END


FUNCTION 1
  # The nodal variable 'divT_' must exist on the input mesh, and this function
  # will use its value to define the boundary condition
  type exodusread
  nodeset 1
  name "divT_"
  exo_var vector divT_
  interp = linear
END

BOUNDARY
  # Absorbing boundary condition
  sideset 6
     infinite_element
     use block 111
END

OUTPUTS
END

ECHO
END

BLOCK 1
  tet4
  material 1
END

BLOCK 2
 material 1
END

# Additional parameters for the non-reflecting boundary condition
Block 111
infinite_element
     ellipsoid_dimensions 1 1 1
     order = 8
     source_origin = 0.05 0 0
     neglect_mass = yes
END


MATERIAL 1
	acoustic
	density 1.1
	c0 343 # This is the fluid wave speed
END

Tied Data
  # Tie fluid domains together.  Acoustic pressure will be the same
  # on both sides of the interface
  surface 2, 5
End