Error: Bulk temperature is undefined for convection surface element

[SteffB]

Hello,

I try to use surface elements (surf152) for applying

Hello,

I try to use surface elements (surf152) for applying convection load.
Unfortunately, I gathered some error message:

*** ERROR *** SUPPRESSED MESSAGE CP = 2.000 TIME= 15:21:59
Bulk temperature is undefined for convection surface element 1281. Use
SFELIST or SFLIST command to find other elements without bulk

The APDL snippet I use is the following:

solve

save,file,db

/prep7
/GOPR
/com,!---------------------------------------------------------------------------------------------------------------------!
/com,Start surf152 for conv
esel,s,ename,,152 ! Element selection of surf152 elements
cm,ELsurf152,elements ! Create a component which includes surf152 elements
edele,ELsurf152 ! Deletion of former surf152 elements

et,100,152
keyopt,100,4,1
keyopt,100,5,0
keyopt,100,8,3

cmsel,s,external,node
esln,all
type,100
esurf
esel,none

esel,s,type,,100
esel,stat
esel,s,ename,,152
esel,stat
cm,surfElem152,elem
esel,stat

allsel,all
outres,all
save,file,db
/com,End surf152 for conv
/com,!---------------------------------------------------------------------------------------------------------------------!
/solu
! trnopt,full
! nropt,full
! thopt,full

save,file,db

antype,,restart

/com,!---------------------------------------------------------------------------------------------------------------------!
/com,Post for surf152
/post1
set, last
esel,s,ename,,152
esel,stat
/com,Post for surf152
/com,!---------------------------------------------------------------------------------------------------------------------!
save,file,db
/solu
antype,,restart

/com,!---------------------------------------------------------------------------------------------------------------------!
/com, Start surf152 selection for conv
esel,stat
sfe,all,1,conv,1,hflux_test
/com, Ende surf152 selection for conv
/com,!---------------------------------------------------------------------------------------------------------------------!

allsel,all
outres,all,all
*enddo

I don’t know how to define the bulk temperature.
Maybe someone has a hint how to achieve this.

With best regards
Steff