January 1, 2023 at 4:10 pm
John Miller
Subscriber

Happy New Year,

@Dave Looman, thanks for your answer.

 

I define in the load loop a component, which includes the currently active external nodes of the extruded material:

cm,external,node

 

I’m struggling still with the esurf command:

ESURF, XNODE, Tlab, Shape
Generates elements overlaid on the free faces of selected nodes.

The XNODE definition is not really clear to me.

With your suggestion, I would script the radiation as follows:

*do,…

…

Load

…

/prep7

/GOPR

*get,nmax,etyp,,num,max

     eakt=nmax+1

*get,mmax,node,,num,max

     nakt=mmax+1

 

et,eakt,surf152       !Surf152 Elements

keyopt,eakt,5,1      !Extra nodes

keyopt,eakt,9,1      !Radiation with form factor real constant

keyopt,eakt,11,1    !Nodes DOF-TTOP

r,eakt,1,5.8e-8        !Stefan Boltzman constant

mp,emis,eakt,0.5   !Emissivity coefficient

mat,eakt                  !Material assignment

type,eakt                 !Type assignment

real,eakt

 

cmsel,s,external

esurf,nakt

 

d,nakt,temp,tamb

alls

toffst,273

/solu

nropt,full

…

Load or something else

…

*enddo

 

Is the radiation with this code applied or is something else necessary in the load stage(/solu) after leaving the /prep7 ?

 

Greetings

John M.