Hi

I am trying to generate a grid for a particle deposition problem using FLUENT. The geometry involves an outer cylinder with a small inner cylinder exactly at the centre of the outer cylinder. Flow enters through a small cylindrical passage from one end of the outer cylinder and impinges on one face of the inner cylinder. The geometry looks something like the drawing below in 2D where 1 is the outer cylinder, 2 is the pathway for flow and the other smaller dots represent the inner cylinder.

1---------------------

2----- ---

2----- ---

1---------------------

I created the 3d geometry as follows: 1) Use 'volume' option to create cylinder 2. 2) Same option to create cyl 1 and then cyl 3. I then tried subtracting vol3 from vol1 and got the message saying that the volume has been subtracted. But the 'shaded' view still shows the opening of cyl 3 grayed out. Any help with this would be appreciated.

even though I can't able to understand your problem completely, I am guessing, the following may be the reason.. In Gambit., there in Volume Subtraction Menu, there are two options, 1)Retain the subtracted volume 2)Delete the subtracted volume... Switch off the Retain option button and try. I hope It will work. Good Luck

That worked!...Thanks!...