[Plaschko]

Hello everybody. I am new with FLUENT.I would like to find an elementary tutorial (such as an understandable version of SimCafe Singleton and Bhaskaran). In the latter tutorial I had to consdider two concentric cylinders (D1,2 =1, 64 m) and use the commmand "Surface from sketches" which did not work. To define a Booleans subraction of the two cylinders I tried extrude-command with equal depth (20 m). I used the outer cylinder (D1=84 m with frozen) as target Body and the inner cylinder (D1=1 m) with add material as target Body. In this way the Boolean subtraction was active, but the "Face selection filters" did not work. This leaded that the rest of the tutorial commands failed.
I would appreciate any comments on this problem. Thanks a lot, Peter