I simulate "2D natural convection problem in a concentric cylinder", but how to select the inner and the outwall of the concentric cylinder, need i selet it cell by cell .

regards

You can use tho cell layers at first and the command bfin to define the inner and outer wall, and delete the second layer and some of the boundaries later.

Another option is to create shells for the whole model using "live surf create" and change the cell types of these shell according to the boundaries. Now put one cell type into the cell set, do a cplot and a "zoom off $ repl". Now you can use "bzon 2 all" to assign region 2 to those cells.

thank you very much , you are really a genius, but i am a new in the star-cd . can you give me some detail suggestion.

regards

Try to understand the following commands


vc3d 0 1 10 0 1 10 0 0.1 1
cset,all
cplot
view 1 1 1
zoom,off $replot
live surf create
cset,all
cplot
ctab 10 shell 3
rp6 1 ,, 1

cset news type 4
cplo
vset news edge
ctype 10
cfin modi 26
cplot
cset dele type 10
cplot

ctype 11
cfin modi 159
cplot
cset dele type 11
cplo

cset subs gran -1 2 0.95 2
cplo
ctype 12
cmod cset
cplot

cset news type 4
cplot
cset subs gran -1 2 -1 0.05
cplot
ctype 13
cmod cset

cset news type 4
cplot
cset subs gran -1 0.5
cplo
ctype 14
cmod cset
cplot

cset news type 4
cplot
ctype 15
cmod cset
cplot

cset,all
cplot

cset news type 10
cplo
zoom,off $replot
bzon 1 all

cset news type 11
cplot
zoom,off $replot
bzon 2 all

cset news type 12
cplot
zoom,off $replot
bzon 3 all

cset news type 13
cplot
zoom,off $replot
bzon 4 all

cset news type 14
cplot
zoom,off $replot
bzon 5 all

cset news type 15
cplot
zoom,off $replot
bzon 6 all

Hi,

I think there is one tutorial explaning this.

please check once again.