*HEADING
FILE NAME: 
FEATURES TESTED: THREE DIMENSIONAL INTERFACE
               : GAP CONDUCTIVITY
                 FIELD VARIABLE DEPENDENCY
*NODE,NSET=NALL
1,   10.0,     0.0
2,   11.0,     0.0
3,   11.0,     0.5
4,   10.0,     0.5
5,   10.0,     0.0,   -1.
6,   11.0,     0.0,   -1.
7,   11.0,     0.5,   -1.
8,   10.0,     0.5,   -1.
9,   10.0,     0.55
10,  11.0,     0.55
11,  11.0,     1.00
12,  10.0,     1.00
13,   10.0,     0.55,   -1.0
14,   11.0,     0.55,   -1.0
15,   11.0,     1.00,   -1.0
16,   10.0,     1.00,   -1.0
*NSET,NSET=MID
1,2,3,4,5,6,7,8
*NSET, NSET=TOP
9,10,11,12,13,14,15,16
*ELEMENT,TYPE=DC3D8,ELSET=MID
1, 1,2,6,5,4,3,7,8
*ELEMENT,TYPE=DC3D8,ELSET=TOP
2,9,10,14,13,12,11,15,16
*ELSET, ELSET=SOLID
1,2
*surface, NAME=SURF1
TOP, S1
*surface, NAME=SURF2
MID,S2
*CONTACT PAIR, INTERACTION=GAPS
SURF1, SURF2
*SURFACE INTERACTION,NAME=GAPS
*GAP CONDUCTANCE,DEPENDENCIES=1
10.,,,,1.
10.,1.,,,1.
15.,,,,2.
15.,1.,,,2.
20.,,,,3.
20.,1.,,,3.
*SOLID SECTION,ELSET=SOLID,MATERIAL=SOLMAT
*AMPLITUDE, NAME=RAMP
0.0, 0.0, 0.0001,1.0
*MATERIAL,NAME=SOLMAT
*CONDUCTIVITY
1., 
*STEP
*HEAT TRANSFER, STEADY STATE
*OUTPUT,FIELD
*NODE OUTPUT
NT,
RFL,
*FIELD, VARIABLE=1, AMP=RAMP
NALL, 1.5
*EL PRINT,FREQ=0
*NODE PRINT
 NT,
 RFL,
*BOUNDARY,OP=NEW
TOP,11,,100.
MID,11,,50.
*CONTACT PRINT
*OUTPUT,FIELD
*CONTACT OUTPUT,VARIABLE=PRESELECT
*END STEP