Page 176 - Using ANSYS for Finite Element Analysis Dynamic, Probabilistic, Design and Heat Transfer Analysis

apDl programming • 163
• Define fin length (L) and fin radius (R) as PARAMETERS to be
used as design variable.
• Using APDL commands get the fin heat transfer rate (THEAT)
and fin tip temperature (Tempend) to be used in the objective
function and state variable.
• Define objective function as ObjFunct=C-TOTALHEAT

/PMETH,OFF,0 ! Setting preference
KEYW,PR_SET,1
KEYW,PR_STRUC,0
KEYW,PR_THERM,1
KEYW,PR_FLUID,0
KEYW,PR_ELMAG,0
KEYW,MAGNOD,0
KEYW,MAGEDG,0
KEYW,MAGHFE,0
KEYW,MAGELC,0
KEYW,PR_MULTI,0
KEYW,PR_CFD,0
!
! *******************************PREPRO-
CESSING
!
/PREP7 ! Enter into preprocessor (PREP7)
!*
ET,1,PLANE55 ! Set element type with
axisymmetric option
!*
KEYOPT,1,1,0
KEYOPT,1,3,1
KEYOPT,1,4,0
KEYOPT,1,8,0
KEYOPT,1,9,0
MPTEMP,,,,,,,, ! Enter material properties
MPTEMP,1,0
MPDATA,KXX,1,,398
L=1.32 ! Set fin length as parameter L
R=12.5e-3 ! Set fin radius as parameter R
BLC4,0,0,R,L ! Geometric modeling in terms
of R and L
FLST,5,2,4,ORDE,2 ! Divide lines 2 and 4
into 600 divisions