*HEADING
          TWO DIMENSIONAL HEAT TRANSFER INTERFACE  (CPE4RT)
          GAP RADIATION 
	  ANALYTICAL RIGID SURFACE
**
** The temperature at the NOUT nodes, based on a 1D model is:
** NT_out=100+HFL2*R_th; R_th=L/(kA);   
** See ch. 1.7.1 of ABAQUS/Verification Manual    
**
*PHYSICAL CONSTANTS,ABS=-460.,STEFAN=5.E-10
*NODE,NSET=NALL
1,10.0,0.0
2,11.0,0.0
3,11.0,0.50
4,10.0, 0.50
7,11.0,1.0
8,10.0,1.
*NSET, NSET=SIDE3
7,8
*NSET,NSET=QA_TEST
1,2
*NSET,NSET=NOUT
QA_TEST,
*ELEMENT,TYPE=CPE4RT,ELSET=MID
1, 1,2,3,4
*ELEMENT, TYPE=CPE4RT,ELSET=TOP
2,4,3,7,8
*ELSET,ELSET=SOLID
1,2
*SOLID SECTION,ELSET=SOLID,MATERIAL=SOLMAT
*MATERIAL,NAME=SOLMAT
*CONDUCTIVITY
1.
*SPECIFIC HEAT
46.
*DENSITY
7850.
*ELASTIC
1.0e-2,0.0
*NODE,NSET=BOT
11,10.5,-.5
*ELEMENT,TYPE=HEATCAP,ELSET=HEATC
99001, 11
*HEATCAP,ELSET=HEATC
1.0,
*RIGID BODY,REFNODE=11, ANALYTICAL SURFACE =SURF4, ISOTHERMAL=YES
*SURFACE, NAME=SURF3
MID, S1
*SURFACE,NAME=SURF4,TYPE=S
START, 10.0,-.01
LINE, 11.0,-.01
*STEP
*DYNAMIC TEMPERATURE-DISPLACEMENT, EXPLICIT
 , 1000000.
*CONTACT PAIR,INTERACTION=GAP,WEIGHT=0.0
SURF3,SURF4
*SURFACE INTERACTION, NAME=GAP
*GAP RADIATION
1.0,1.0
1.0,0.0
1.0,10.0
*BOUNDARY,OP=NEW
11,  1, 6, 0.0
SIDE3,11,,100.
BOT,11,,50.
******************************
*FILE OUTPUT, NUM=1
*NODE FILE,NSET=NOUT
 NT,
******************************
*OUTPUT,FIELD,NUM=1
*NODE OUTPUT,NSET=QA_TEST
NT
*NODE OUTPUT,NSET=NALL
NT
********************************
***OUTPUT, HISTORY,TIME INTERV=1E5
***NODE OUTPUT, NSET=NOUT
**NT, 
***ELEMENT OUTPUT, ELSET=SOLID
**HFL2,
********
*OUTPUT, HISTORY,TIME INTERV=1.0E6
*ENERGY OUTPUT,VAR=ALL
*********
*END STEP