hai everyone:

http://162.105.139.102/LB5000/non-cgi/usr/6/6_5992.bmp

In gambit,how can I generate this kind of grid? I am very glad to someone who can tell me how to do.

If ths s a 2D problem ----

create a rectangle outer most domain. create the bigger circle. both as faces. subtract the circle frm the rectangle. then using the edge of the holloe circle, using "create face from wireframe" option again create the big circle.

now create the smaller circle and do the same procedure. u got it right !!!! try

I have tried it. Thanks.

But the small circle turns to polygon. Can this problem be solved?