( Heat transfer + radiation to environment.
  Three-dimensional.
  The lower four nodes keep temp. 0.
  The upper four nodes radiate to environmental temp. 1.
  The conductivity and radiation coeff. are such that
  the temperature of the upper four nodes should become 0.5 )

echo -no
number_of_space_dimensions 3
condif_temperature
end_initia

node 1  0 0 0
node 2  1 0 0
node 3  1 1 0
node 4  0 1 0
node 5  0 0 1
node 6  1 0 1
node 7  1 1 1
node 8  0 1 1
element 1 -hex8 1 2 4 3 5 6 8 7

geometry_quadrilateral 1  0 0 0  1 0 0  0 1 0  1 1 0  0.01
geometry_quadrilateral 2  0 0 1  1 0 1  0 1 1  1 1 1  0.01

bounda_unknown 0  -geometry_quadrilateral 1 -temp
bounda_time    0  0.0 0.0 100. 0.

group_type 0  -condif
group_condif_density 0  1.0
group_condif_capacity 0  0.1
group_condif_conductivity 0  1.875

condif_radiation 0  1. 1.
condif_radiation_geometry 0  -geometry_quadrilateral 2

print_filter 0  -node_dof -geometry_quadrilateral 2 -temp

control_timestep        0  0.01 0.5
control_options_solver  0  -matrix_iterative_bicg
(control_print          0  -time_current -node_dof)

target_item  0  -node_dof 5 -temp
target_value 0  0.5 1.e-4
end_data
