[adr]

Hi friends,

I am a University student. I have one signature with Ansys APDL, and I'm going crazy with one exercise. I am doing a thermal case in Ansys Apdl, I have 3 cases:

Number 1: the temperature in surface 6 of the geometry is imposed for a convection. RUNS OK

Number 2: the temperature in surface 6 is fixed. RUNS OK

Number 3: the temperature in surface 6 of the geometry is imposed for a radiation. RUNS NO OK. ANsys Show me a message indicating that the problem can't be solve because dont have a degree of freedom.

Can any one help me please with exercice 3?

THANKS A LOT


this is the programming:

/PREP7
C*** /TRIAD,OFF
*SET,malla,10
*SET,Radio1,0.5
*SET,Radio2,1
ET,1,70
MP,KXX,1,10
CSYS,2
K,1,Radio1,88,-45
K,2,Radio1,88,45
K,3,Radio1,0,45
K,4,Radio1,0,-45
K,5,Radio2,88,-45
K,6,Radio2,88,45
K,7,Radio2,0,45
K,8,Radio2,0,-45
V,1,2,3,4,5,6,7,8
*GET,LON1,LINE,1,LENG
*GET,LON4,LINE,4,LENG
*GET,LON7,LINE,7,LENG
LESIZE,4,,,malla
LESIZE,2,,,malla
LESIZE,12,,,malla
LESIZE,8,,,malla
LESIZE,1,,,NINT(malla*LON1/LON4)
LESIZE,3,,,NINT(malla*LON1/LON4)
LESIZE,10,,,NINT(malla*LON1/LON4)
LESIZE,6,,,NINT(malla*LON1/LON4)
LESIZE,11,,,NINT(malla*LON7/LON4),(Radio1/Radio2)
LESIZE,7,,,NINT(malla*LON7/LON4),(Radio1/Radio2)
LESIZE,9,,,NINT(malla*LON7/LON4),(Radio1/Radio2)
LESIZE,5,,,NINT(malla*LON7/LON4),(Radio2/Radio1)
MSHKEY,1
VMESH,1
FINISH

/SOLU
SFA,1,,HFLUX,400
STEF,0.119E-10
SPCTEMP,STAT,20
C*** SFA,6,,CONV,5,20 !exercice 1
C*** DA,6,TEMP,30 !exercice 2
SFA,6,,RAD,0.95,20 !exercice 3:error in this comand
TOFFST,273
NSUB,3
SOLVE
FINISH

/POST1
/TRIAD,OFF
/SHOW,WIN32C
/CONT,1,128,AUTO
PLNSOL,TEMP
FINISH