*HEADING
 FILE NAME : 
 FEATURES TESTED : THREE DIMENTIONAL HEAT TRANSFER INTERFACE
                   GAP CONDUCTANCE
*NODE
 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
*NGEN,NSET=SIDE_01
1,7,3
*NGEN,NSET=SIDE_02
3,9,3
*NGEN,NSET=SIDE_03
1,3,1
*NGEN,NSET=SIDE_04
7,9,1
*NSET,NSET=TOP_NODE
SIDE_01,SIDE_02,SIDE_03,SIDE_04,
*NCOPY,CHANGE NUMBER=10,OLD SET=TOP_NODE,NEW SET=BOT_NOD,SHIFT
0.0,0.0,-1.1

*ELEMENT,TYPE=DS8,ELSET=TOP_EL
1,1,3,9,7,2,6,8,4
*ELGEN,ELSET=BOTH
1,2,10,1
*ELSET,ELSET=BOTT_EL
 2, 
*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_NODE,15,,100.0
BOT_NOD,11,15,50.0
*CONTACT PRINT
*CONTACT FILE
*END STEP