*HEADING
ECA8DFDJ: *DSFLUX, *SFILM, AND *SRADIATION FOR HEAT TRANSFER ELEMENTS  [DCAX8]
*NODE,NSET=ALL
 1, 1.
 2, 8.
 3, 8.,7.
 4, 1.,7.
 5, 4.5,0.
 6, 8.,3.5
 7, 4.5,7.
 8, 1.,3.5
*NSET,NSET=FIX1
 1,2,5
*NSET,NSET=FIX2
 2,3,6
*NSET,NSET=FIX3
 3,4,7
*NSET,NSET=FIX4
 1,4,8
*ELEMENT,TYPE=DCAX8, ELSET=EALL
 1, 1,2,3,4,5,6,7,8
*surface, NAME=SIDE_1
 1, S1
*surface, NAME=SIDE_2
 1, S2
*surface, NAME=SIDE_3
 1, S3
*surface, NAME=SIDE_4
 1, S4
*SOLID SECTION,MATERIAL=A1, ELSET=EALL
*PHYSICAL CONSTANTS, ABSOLUTE ZERO=-460., STEFAN BOLTZMANN = 5.E-8
*MATERIAL,NAME=A1
*CONDUCTIVITY
 3.77E-5, 
*SPECIFIC HEAT
 .39, 
*DENSITY
 82.9, 
*BOUNDARY
 FIX1, 11
*STEP
*HEAT TRANSFER,STEADY STATE
*NODE PRINT
 NT,RFL
*NODE FILE
 NT,RFL
*EL PRINT,FREQ=0
*EL FILE
*DFLUX,OP=NEW
 1, BF, .3
*CONTROLS, PARAMETERS=FIELD

,0.0,
*END STEP
**------------end of step 1-------------
*STEP
*HEAT TRANSFER, STEADY STATE
*BOUNDARY,OP=NEW
 FIX3,11
*DFLUX,OP=NEW
*DSFLUX,OP=NEW
 SIDE_1, S, .3
*END STEP
**------------end of step 2-------------
*STEP
*HEAT TRANSFER, STEADY STATE
*BOUNDARY,OP=NEW
 FIX4,11
*DSFLUX,OP=NEW
 SIDE_2, S, .3
*END STEP
**------------end of step 3-------------
*STEP
*HEAT TRANSFER, STEADY STATE
*BOUNDARY,OP=NEW
 FIX1,11
*DSFLUX,OP=NEW
 SIDE_3, S, .3
*END STEP
**------------end of step 4-------------
*STEP
*HEAT TRANSFER, STEADY STATE
*BOUNDARY,OP=NEW
 FIX2,11
*DSFLUX,OP=NEW
 SIDE_4, S, .3
*END STEP
**------------end of step 5-------------
*STEP
*HEAT TRANSFER,STEADY STATE
*SFILM,OP=NEW
 SIDE_1, F, 75., .103
*BOUNDARY,OP=NEW
 FIX3, 11
*DSFLUX,OP=NEW
*END STEP
**------------end of step 6-------------
*STEP
*HEAT TRANSFER,STEADY STATE
*SFILM,OP=NEW
 SIDE_2, F, 75., .103
*BOUNDARY,OP=NEW
 FIX4, 11
*END STEP
**------------end of step 7-------------
*STEP
*HEAT TRANSFER, STEADY STATE
*SFILM, OP=NEW
 SIDE_3, F, 75., .103
*BOUNDARY,OP=NEW
 FIX1, 11
*END STEP
**------------end of step 8-------------
*STEP
*HEAT TRANSFER,STEADY STATE
*SFILM,OP=NEW
 SIDE_4, F, 75., .103
*BOUNDARY,OP=NEW
 FIX2, 11
*END STEP
**------------end of step 9-------------
*STEP
*HEAT TRANSFER, STEADY STATE
*SRADIATE, OP=NEW
 SIDE_1, R, 75., 1.E-6
*BOUNDARY,OP=NEW
 FIX3, 11
*SFILM,OP=NEW
*END STEP
**------------end of step 10-------------
**Modifying reference ambient temperature on *RADIATE.
*STEP
*HEAT TRANSFER, STEADY STATE
*SRADIATE, OP=MOD
 SIDE_1, R, 50., 1.E-6
*BOUNDARY,OP=NEW
 FIX3, 11
*SFILM,OP=NEW
*END STEP
**------------end of step 11-------------
**Modifying reference ambient temperature on *RADIATE
** to the same value as in step 10. Results at end of this
** step should be the same as those at the end of step 10.
*STEP
*HEAT TRANSFER, STEADY STATE
*SRADIATE, OP=MOD
 SIDE_1, R, 75., 1.E-6
*BOUNDARY,OP=NEW
 FIX3, 11
*SFILM,OP=NEW
*END STEP
**------------end of step 12-------------
**Modifying radiation constant on *RADIATE.
*STEP
*HEAT TRANSFER, STEADY STATE
*SRADIATE, OP=MOD
 SIDE_1, R, 75., 2.E-7
*BOUNDARY,OP=NEW
 FIX3, 11
*SFILM,OP=NEW
*END STEP
**------------end of step 13-------------
**Modifying radiation constant on *RADIATE to the same 
** value as in steps 12 and 10. Results at end of this
** step should be the same as those at the end of step 10.
*STEP
*HEAT TRANSFER, STEADY STATE
*SRADIATE, OP=MOD
 SIDE_1, R, 75., 1.E-6
*BOUNDARY,OP=NEW
 FIX3, 11
*SFILM,OP=NEW
*END STEP
**------------end of step 14-------------
*STEP
*HEAT TRANSFER, STEADY STATE
*SRADIATE, OP=NEW
 SIDE_2, R, 75., 1.E-6
*BOUNDARY,OP=NEW
 FIX4, 11
*END STEP
**------------end of step 15-------------
*STEP
*HEAT TRANSFER, STEADY STATE
*SFILM, OP=NEW
*SRADIATE, OP=NEW
 SIDE_3, R, 75., 1.E-6
*BOUNDARY,OP=NEW
 FIX1, 11
*END STEP
**------------end of step 16-------------
*STEP
*HEAT TRANSFER, STEADY STATE
*SRADIATE,OP=NEW
 SIDE_4, R, 75., 1.E-6
*BOUNDARY,OP=NEW
 FIX2, 11
*END STEP
**------------end of step 17-------------
**Modified temperature on *RADIATE
*STEP
*HEAT TRANSFER, STEADY STATE
*SRADIATE,OP=MOD
 SIDE_4, R, 50., 1.E-6
*BOUNDARY,OP=NEW
 FIX2, 11
*END STEP
**------------end of step 18-------------
**Performing a transient heat transfer analysis
**to obtain steady-response. The *AMPLITUDE card
**has been used to vary the temperature from its 
**initial value to the value used in step 17.
** Results at the end of this step will be identical
** to the results at the end of step 17.
*STEP,INC=10000
*HEAT TRANSFER,DELTMX=0.1
0.0001,1.0d8,,,
*SRADIATE,OP=MOD,AMPLITUDE=STEP
 SIDE_4, R, 50., 1.E-6
*AMPLITUDE,NAME=STEP,TIME=STEP TIME
0.0,1.0,1.0d3,1.5
*BOUNDARY,OP=NEW
 FIX2, 11
*NODE PRINT,FREQ=9999
NT11,RFL11
*END STEP
**------------end of step 19-------------
**Modifying ambient reference temperature.
*STEP
*HEAT TRANSFER, STEADY STATE
*SRADIATE,OP=MOD
 SIDE_4, R, 50., 1.E-6
*BOUNDARY,OP=NEW
 FIX2, 11
*END STEP
**------------end of step 20-------------
**Results at the end of this step will be identical
** the results at the end of step 19.
*STEP,INC=10000
*HEAT TRANSFER,DELTMX=0.1
0.0001,1.0d8,,,
*SRADIATE,OP=MOD
 SIDE_4, R, 75., 1.E-6
*BOUNDARY,OP=NEW
 FIX2, 11
*NODE PRINT,FREQ=9999
NT11,RFL11
*END STEP
**------------end of step 21-------------