*HEADING
 FILE NAME : 
 FEATURES TESTED : THREE DIMENTIONAL HEAT TRANSFER INTERFACE
                   GAP CONDUCTANCE
*NODE,NSET=TOP_NOD
 1, 10.0,  0.0, 0.5
 3, 11.0,  0.0, 0.5
 7, 10.0, -1.0, 0.5
 9, 11.0, -1.0, 0.5
*NCOPY,CHANGE NUMBER=10,OLD SET=TOP_NOD,NEW SET=BOT_NOD,SHIFT
0.0,0.0,-1.1

*ELEMENT,TYPE=DS4,ELSET=TOP_EL
1,1,3,9,7
*ELEMENT,TYPE=DS4,ELSET=BOTT_EL
2,11,13,19,17
*ELSET,ELSET=BOTH
TOP_EL,BOTT_EL,
*SHELL SECTION,ELSET=BOTH,MATERIAL=SOLMAT
1.0,5
*MATERIAL,NAME=SOLMAT
*CONDUCTIVITY
1.0, 
*surface,NAME=SURF_01
TOP_EL,SNEG
*surface,NAME=SURF_02
BOTT_EL,SPOS
*CONTACT PAIR,INTERACTION=GAP
SURF_01,SURF_02
*SURFACE INTERACTION,NAME=GAP
*GAP CONDUCTANCE
10.0,0.0
10.0,0.1
10.0,1.0
*STEP
*HEAT TRANSFER, STEADY STATE
*NODE FILE
NT,
RFL,
*EL PRINT,FREQ=0
*NODE PRINT
NT,
RFL, 
*BOUNDARY,OP=NEW
TOP_NOD,15,,100.0
BOT_NOD,11,15,50.0
*CONTACT PRINT
*CONTACT FILE
*END STEP